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NLG Users Repair Logs and Other Ramblings. Request your very own topic. Just ask any site staff. => Channelmaniac's Arcadecomponents' Old School Repair Logs => Topic started by: channelmaniac on May 07, 2014, 06:41:28 PM
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Fixed: TMNT (Teenage Mutant Ninja Turtles):
Symptom: Garbled background and foreground graphics
Repaired 2 gouged traces to fix the foreground objects. Resoldered cold solder joints on the background ROMs to fix background images and score/health display.
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Fixed: Crime Fighters:
Symptom: ROM error and garbled foreground graphics
Pulled the ROM and compared its checksum against the MAME database. ROM was good but the data line was held low. It connected to a Konami custom surface mount chip. Swapped out bad custom chip "051962" with one from a dead Konami parts board.
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Fixed: Run and Gun
Symptom: Dead
A physical inspection turned up 2 gouged traces and bent pins / busted solder joints on 2 surface mount ICs. Fixed the traces, bent pins, and busted solder joints. Board would still not boot. Checked the ROMs on the board. Replaced one bad Mask ROM, one bad EPROM, and erased/reprogrammed a third EPROM to match the code used in replacing the bad program EPROM.
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Fixed: Lethal Enforcers II
Symtom: No video
Replaced a broken 056820 hybrid IC with one from a parts board. Board works but the connectors between the top and bottom board are finicky. You have to push them together firmly to keep from getting graphic corruption on the foreground characters. Cannot fully test it since I don't have any guns to connect to it.
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Fixed: Run and Gun
Symptom: Ressurect parts board
A physical inspection turned up patched JAMMA connections, 5 missing ROMs and a missing sound CPU. Fixed the JAMMA connector, burned new EPROMs, and replaced the missing sound CPU. Board would boot but give RAM errors for 27H and 29H and a bad EEPROM error.
RAMs had no address line activity. Noticed one desoldered hole next to the RAMs. Checked the MAME board pics and the board was missing a chip - 74LS244. Replaced the missing chip and the board would boot and pass the RAM diagnostics but still gave an EEPROM error.
Found the reset instructions for Konami boards: power it up with the test switch pressed. This caused the game to reset the EEPROM data which finished the game repair.
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Model: Various Konami games
Tip: Resetting EEPROM data
When repairing Konami boards it is important to remember that the NVRAM data saved on the EEPROM chips is directly related to the versions of the code in ROMs/EPROMs on the game.
If you are replacing code with a different version, wheter to upgrade it or simply because that was what was available in MAME to use for repairs, you will most likely need to reset the EEPROM data. To do this hold down the test button located on the game board itself and turn power on. Release the switch when it tells you on the screen. You have just reset the EEPROM data.
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Model: Monster Maulers
Symptom: Corrupt graphics colors. Tapping board made problems come & go
Resoldered surface mount IC 25V and tested board.
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Model: Contra
Symptom: Horizontal white lines on the screen
The board had horizontal white lines through all background images. Player and power ups looked normal. Checked the ROMs on the board and found the video ROM at location 7F had all outputs stuck high.
The ROM was a 2Mb mask ROM with an odd pinout. Used a 27C400 EPROM to replace it. Tied pin 1 (A17) to ground. The pin was left floating on the board since it was unused on the 2Mb ROM.
Played a game to test the board.
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Model: Gokukyo Parodius (Fantastic Journey)
Symptom: Dead
Board would boot with out the ROM board attached. ROM board would boot when put on a different main board.
Swapped out connector CN106 and CN107 on the ROM board and CN106 on the main board. Tested game.
Connectors were spread out and very loose. The boards worked when swapped with different ones due to differences in tolerances.
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Model: Tokomeki Taisen Puzzle Dama
Symptom: Corrupt Graphics
Board had problems with the main board. Removing the ROM board and tapping on the main board would result in green flashes on the screen.
Resoldered 31S, 25S, and 16G. 14P had been replaced before and had bent pins. Straightened one pin and resoldered the chip.
Tested board.
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Model: Hyper Sports
Symptom: Dead
Board would display garbage upon power up. Checked and cleaned the program ROM legs. Repaired a corroded leg on the C06 EPROM then replaced corroded socketson the C05 and C06 EPROMs. The board would then power up and play but had graphics corruption on text elements.
Cleaned the EPROM and custom chip legs on the video board to finish the repair.
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Model: Martial Champion
Symptom: Corrupt Graphics.
Character graphics and some scaling background graphics corrupt. Some graphics partially off screen.
Board passes initial self tests. Pushing down on the surface mount ICs had no effect.
Pushed the test button and ran the Mask ROM test. ROM 22K, 20K, 19K, 17K, 12K, and 10K were showing to be bad. These ROMs were connected to the surface mount custom IC 055673 at location 14K. Resoldered the chip to fix the corrupt graphics.
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Model: Time Pilot
Symptom: Dead
Replaced 1 bad socket and cleaned the corrosion off and repaired a broken pin on a custom Konami IC. Replaced 1 corroded capacitor and resoldered one that had come loose from its solder. Tested board.
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Model: Time Pilot '84
Symptom: Burnt edge connector
Board had burnt edge connector contacts for the +5v and ground connections. Removed the bad traces and laid down new ones with copper tape. Tested.
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Model: The Simpsons
Symptom: Will not boot. Bad ROM error
Board had attempted upgrade and repair damage. Many plated through holes and traces were damaged on the sound ROM and around the sound ROM.
Replaced 2 bad sockets and patched 10 traces. Board would then boot but was stuck in a reboot cycle when trying to test the ROM in location 15C on startup. Reset only happened when the board was first powered on after sitting. Custom IC 051550 was resetting the system. Soldered JP1 to disable the watchdog to finish the repair.
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Model: Mystic Warriors
Symptom: EEPROM Error
EEPROM IC tested good. A check of pin 3 showed it was shorted to ground through approx 26 ohms. Replaced the shorted 74LS273 at location 15G, reset the EEPROM data, and tested the game. The game worked but was missing text and motion graphics. Resoldered the surface mount chip at 14K to finish the repair.
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Model: Metamorphic Force
Symptom: Left input for player one not working
Patched bad trace and tested board.
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Model: Mystic Warriors
Symptom: Board would start self test and stick at "RAM ROM CHECK"
Board would boot into an EEPROM test/initialization if the test button was held down when powered on but would lock up when trying to normally start. The hybrid sound module, part # 054986A was cracked into 2 pieces. Replaced the hybrid module with one from a donor board and tested the game.
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Model: Mystic Warriors
Symptom: Input problems
Checked the JAMMA edge connector with a logic probe and found correct logic levels: high when button is open and ground when closed.
Checked the traces through the resistor networks and back to the 74LS257 at 19B. Logic levels were good going to the chip. Replaced the bad chip and tested the game. Found some corrupt graphics. Resoldered the surface mount chip at 14K, 14J, and one side of 8J to fix.
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Model: The Simpsons
Symptom: Stuck in reset (Watchdog)
The data bus lines were stuck high. Checked the 74LS245 at 12D. It was good. Pin 22 at 13C and 15C should've mirrored pin 22 at 16C/17C but was stuck high. Repaired broken trace between 3F pin 8 and pin 22 of 13C/15C. Tested game.
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Model: Mikie
Symptoms: No audio
Board had physical damage. Replaced 3 broken capacitors, 1 LM324 Op-Amp, and the LA4460 audio output IC. Tested game and found corrupt graphics. Reprogrammed the EPROM at H1 with the code for the USA version. It had the Japanese version of code on it.
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Model: Mikie
Symptoms: Corrupt graphics
This board was in strange shape with extra chips on it. Removed 3 EPROMs with incorrect code from the board. The board had the 27128 version chips and some of the 2764 version of chips on it. The 2764 chips were not necessary for the game to operate. Verified the remaining EPROMs were correct and in the proper position on the board. Address lines A0 and A10 on the graphics EPROMs were stuck high. Replaced a bad 74LS373 IC at C6 to fix the graphics problems and tested the board.
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Model: TMNT
Symptom: Graphic Corruption
Model would play but had lines in the graphics. Replaced bad ROM and tested.
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Model: Metamorphic Force
Symptom: Graphic issues
Background and foreground graphics would disappear when board is flexed and/or tapped. Reflowed custom surface mount ICs at 7K, 12K, and 15K and tested.
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Model: Bucky O'Hare
Symptom: Missing color
The blue output was missing. The custom hybrid, number 054573 at location U73 had inputs but no outputs. Replaced the hybrid and tested.
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Model: Simpsons
Symptom: Plays blind - random garbage on screen.
Board would sometimes work perfectly then on next power up be scrambled again. Resoldered damaged pins on 053247 at 7J and repaired 1 shorted trace where a solder pad was mashed into a neighboring trace. This helped but did not fix it. Replaced missing 051550 hybrid IC and tested. Board worked except was missing sounds 01 through 28. Found a factory solder bridge between pins 23 and 24 of 053260 at 3E. Removed the bridge and all the sounds are now working. Ran self tests and found the P4 down control stuck low. Replaced a bad 005273 hybrid module at S37 to fix. Played the game all the way through to check it out.
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Model: Hyper Sports
Symptom: Dead. Graphics corruption. Foreground AND background.
This is a board from hell. Not sure what happened to it but it HAD to be a power surge of some kind.
Replaced the 74LS04 on the CPU board to fix the dead CPU issue. On the video board, EPROM C26 was bad. Replaced. Signals on the address lines of C11 to C18 were incorrect. Replaced F15 and F16
Working backwards from the video outputs I found:
Output pins stuck on MOST LS157 ICs. Replaced C17, D17, E17, D16, and A4
Output pins stuck on D11, E11, E12, G12, E13, F13, G13, and F14.
Pins racing on D9, E9, E10, H10, and J10.
All of those chips tested bad on my EPROM programmer.
Now I have graphics but have some sparklies around border graphics and a missing title screen to track down. Bad LS377 at H12 on the video board. Replaced and the board is now fixed.
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Model: Hyper Olympics 84
Symptom: Dead
CPU board tested good by substitution. Replaced bad 504 and 082 custom Konami chips. Board now runs but has corrupt player graphics. Signal DM7 (pin 11 of H3) is stuck low causing the corruption. The chip at H3 and the chips it drives at J4 and H4 are all good. The CLK4 signal is incorrect. A check of a good board shows pulses in groups of 3 and the bad board shows pulses in groups of 2... Replaced a bad 74LS20 at location E16 to finish the repair.
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Tip: Konami custom chip replacements
Konami used some PC daughter boards to replace custom ICs.
PWB 402034 = Custom IC # 501
PWB 4000206A = Custom IC # 504
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Model: Mystic Warrior
Symptom: RAM Failure
Self test showed that 9E, 10E, and 11E had failed. Inspected the board and found 3 bent/shorted pins on the custom IC 054338 at 10C. Fixed the pins and tested the board.
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Model: Jail Break
Symptom: Audio issues
Reseated the audio CPU as it was partially out of the socket. Board would not accept any coin inputs for coin slot 1. Replaced a custom 005273 hybrid and the 74LS253 IC it was feeding. Tested game.
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Model: Hyper Olympics (bootleg)
Symptom: Short
Short circuit was caused by an extra ground wire not listed on the pinouts in the manual. This was shorting the -5v from the power supply to the ground through the Konami to JAMMA adapter. Cut the trace to the edge connector, replaced a physically damaged capacitor in the audio section, and tested.
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Model: Warzaid
Symptom: No sync
Replaced back chip a U31 and tested.
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Model: Bucky O'Hare
Symptom: Up control stuck on
Replaced bad hybrid module 005273A and a bad 74LS257 IC. Jumpered 1 bad trace and tested.
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Model: The Simpsons
Symptom: EEPROM Error and no red output
Removed a solder splash bridge between pins 15 and 16 of the IC at 11D and reset the EEPROM data to fix the error. Replaced the custom hybrid 052535 on the red output to restore proper colors.
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Model: The Simpsons
Symptom: Crashes Randomly
Board would pass self tests and play in attract mode but would crash randomly when playing the game and when running ROM tests from the menu. Replaced a mix-matched set of program EPROMs that were 120 to 200ns with 4 matched 100ns EPROMs. Board ran and passed all self tests. Played the game through to the end to test.
The 2 200ns EPROMs were too slow for the CPU and were causing random crashes..
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Model: Teenage Mutant Ninja Turtles
Symptom: RAM/ROM errors
Board had physical damage. Fixed bent pins on 3 custom ICs. Resoldered one side of 2 custom ICs to fix solder wipe shorts. Repaired 9 gouged traces. Tested.
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Model: Various
Tip: Konami 007232 Pinout
This is the D/A Converter IC used in many Konami games for sound effects along side the YM2151 FM music synthesizer chip.
Here is a preliminary pinout based on a Super Contra game that was pinned out. There are still unknown pins on the IC and missing functions that need to be mapped to it such as R/W and /IRQ. It is also missing a 3rd select line for ROM access select.
1 - CPU Data 0
2 - CPU Data 1
3 - CPU Data 2
4 - CPU Data 3
5 - CPU Data 4
6 - CPU Data 5
7 - CPU Data 6
8 - CPU Data 7
9 - Output Channel 1 - These connect to the 007340 DAC
10 - Output Channel 1
11 - Output Channel 1
12 - Output Channel 1
13 - Output Channel 1
14 - Output Channel 1
15 - Output Channel 1
16 - Gnd
17 - Output Channel 2 - These connect to another 007340 DAC
18 - Output Channel 2
19 - Output Channel 2
20 - Output Channel 2
21 - Output Channel 2
22 - Output Channel 2
23 - Output Channel 2
24 - ROM Data 7
25 - ROM Data 1
26 - ROM Data 8
27 - ROM Data 2
28 - ROM Data 6
29 - ROM Data 3
30 - ROM Data 4
31 - ROM Data 5
32 - Vcc
33 - ROM A0
34 - ROM A1
35 - ROM A10
36 - ROM A2
37 - ROM SELECT A1
38 - ROM A3
39 - ROM A4
40 - ROM A11
41 - ROM A5
42 - ROM A9
43 - ROM A6
44 - ROM A8
45 - ROM A7
46 - ROM A13
47 - ROM A13
48 - Gnd
49 - ROM A14
50 - ROM A15
51 - CLOCK (3.597Mhz)
52 - ?
53 - ?
54 - ?
55 - ROM SELECT A2 (Signal inverted on Super Contra by an LS04)
56 - Vcc
57 - Vcc
58 - CPUA0 (Signal inverted on Super Contra by an LS04)
59 - CPU A1
60 - CPU A2
61 - CPU A3
62 - ?
63 - /RESET
64 - Vcc
ROM SELECT signals are used by the 74LS138 on the ROM board of the Super Contra game to select one of 8 Sound ROMs
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Model: Super Contra
Symptom: Garbled Audio
This one took a long time to track down. Replaced female socket connector between the CPU board and the ROM board. Tested.
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Model: Teenage Mutant Ninja Turtles
Symptom: RAM Error
Replaced 1 SRAM, 1 74LS245, and 1 74LS32 IC. Tested.
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Model: TMNT - Turtles in Time
Symptom: RAM Error
Removed foreign substance from the board and patched 1 trace. Tested.
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Model: Time Pilot 84
Symptom: Graphic corruption
Replaced a bad 74LS273 and 74LS86 to fix the background graphics corruption. Replaced a bad 74LS273 to fix the player/enemy sprite corruption. Tested.
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Model: Time Pilot
Symptom: Dead
Board would boot if powered on multiple times. Recapped reset circuit and tested.
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Model: Tutankham
Symptom: Dead
Board would boot if powered on multiple times. Recapped reset circuit and tested.
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Model: Loco-Motion
Symptom: Reboots while playing. No audio.
Caps had leaked electrolyte out the negative leads. Removed caps, cleaned board, and recapped. Replaced 2 bad Program EPROMs. Audio IC had every pin clipped. Soldered on new leads and reinstalled. Tested board.
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Model: Teenage Mutant Ninja Turtles (TMNT)
Symptom: Low audio and distortion
Replaced bad audio pot, recapped audio section, and tested.
**edit**
Board was sent back for the same problem. Found that the problem was worse the longer it was on and that pin 12 of LM324 at U91 had spurious signals on it when the sound was going bad. Replaced 3 tantalum capacitors at C7, C12, and C8. Played through the whole game to test.
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Model: Life Force
Symptom: Dead, garbage on screen.
Replaced bad 74LS244 at 20D and 19J on the CPU board to fix it. Replaced bad 74LS04 at 10C and 74LS86 at 9D on the video board to finish the repair.
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Model: Nemesis
Symptom: Dead
Replaced 2 74LS245 ICs and 2 SRAMs on the CPU board. Replaced 1 74LS273 IC on the video board. Tested.
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Model: The Simpsons
Symptom: Dead
Removed 1 short from the bottom of the board where a trace was smeared over to the adjacent plated thru hole. Board booted but reported a bad RAM. Patched a damaged trace and tested.
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Model: X-Men
Symptom: No audio
Recapped the audio hybrid module and patched one trace on it. Tested.
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Model: Gyruss
Symptom: No sound. Missing heatsinks. White line on top of screen.
Replaced bad audio amplifier and 4 100uf capacitors. Installed 2 heatsinks. Resoldered pulled cap on IC at A6 and cleaned the legs on the 3 PROMs to fix the video issue. Tested.
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Model: Track and Field
Symptom: Corrupt graphics and speech.
Cleaned the speech ROM's legs and replaced the corroded socket. Jumpered a gouged trace on pin 2 of the 2128 SRAM chips. Tested.
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Model: Track and Field
Symptom: Dead
Cleaned pins on the CPU and replaced bad socket. Cleaned pins on the ROMs at A1/A2. Board booted but had corrupt graphics. Replaced a bad 74LS377 to fix the graphics corruption. Graphics were misplaced horizontally and runner would run off the right side of the screen during the long jump on attract. Replaced 74LS08 @ 2F which had a dead output. Replaced 74LS139 at 14D which had a dead output to fix the graphics misplacement. Replaced bad 74LS273 at 13E to fix a background color problem. Tested.
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Model: Double Dribble
Symptom: Dead. Loud constant beep from speaker
Board had multiple Fujitsu TTL logic failures.
Installed a missing 3.58MHz oscillator at G12. Replaced 74LS74 ICs at B16, B15, A11, D15, and G8, replaced a bad 74LS02 at F9, and replaced a bad 74LS00 at A17. Board would then boot but had missing and garbled graphics. Rearranged the ROMs back into the proper sockets and programmed replacements for I8, and I12. Game looked better, but still had garbled text on the screen. Replaced bad Mask ROM at E12. Player graphics were still corrupted. Replaced bad 4464 DRAM chips at I17 and I18 and board suddenly lost all backgrounds while retesting. Replaced bad 74LS32 at H12 to restore the backgrounds.
Game would play but had corrupt sounds instead of speech. Replaced bad 74LS374 at D7 to restore speech. Ran board through self tests and discovered DIP switch bank 2 was not working. Replaced a bad 74LS244 at H6 to restore DIP switch operation.
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Model: Teenage Mutant Ninja Turtles
Symptom: Will not coin up. Player 2 will not move right
Board had attempted repair damage.
Replaced 2 005273 custom SIPs, patched 2 damaged traces, and replaced a bad 74LS253 at location A27. Tested.
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Model: Sunset Riders
Symptom: Bad ROM at L7, lines in graphics
Straightened shorted bent pin on custom at 15H. Repaired bad trace between ROM at L7 and custom IC at 3J. Tested.
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Model: Gyruss
Symptom: Garbage on screen. Physical damage.
Patched 4 damaged traces for data lines on the ROM at 19E. This restored the text and title screen but the globe on the title screen was corrupt and the motion objects were missing but would sometimes flicker in pieces on the screen. Found four dead address lines on the SRAM at 17C. Replaced 74LS157 at 18B to restore video and tested. Game would play but had random corruption on the screen. Replaced the remaining Fujitsu 74LS157 ICs at 17B, 19B, 17A, 17B, and 17C. Tested.
Reset DIP switches to standard from Free Play and board would coin up on power up. Replaced 74LS253 with shorted input at 3H, fixed a burned edge connector trace, and retested.
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Model: Circus Charlie
Symptom: Dead
Cleaned edge connector. Replaced 2 47uf and 1 220uf cap in the reset circuit. Cleaned the legs on 2 graphics ROMs to fix corrupted graphics issues. Replaced bad ribbon cable to fix sound and coin-up issues. Installed missing hardware and tested.
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Model: Hyper Sports
Symptom: Dead. Garbage on screen.
CPUs are stuck in watchdog. The custom Konami CPU is dead. Replaced 74LS04 in the clock circuit at B3 on the CPU board to fix clock to main CPU. Board had random reboots and garbage on screen. Replaced bad socket on the 085 custom at C5 and cleaned the rusted and tarnished pins on the custom. Board would play but had 2 lines of garbage on screen and some random colored squares. Replaced the RAM at G10 to fix the garbage problem and the RAM at G9 to fix the colored square issue. Reset the DIP switches to clear the high score table and tested. Replaced missing hardware and reassembled the board stack.
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Model: Track & Field
Symptom: Graphic corruption
Logo graphics and player sprites corrupted. Replaced bad 74LS245 at J16 and 2114 RAM at K15. Tested and found background had disappeared and would come back if background image ROMs were tapped. Cleaned legs on the background image ROMs and tested.
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Model: Track and Field
Symptom: No sound
Cleaned legs on the EPROMs on the sound board and tested. Replaced the 220uf and 2 47uf capacitors in the reset circuit and retested.
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Model: Mikie
Symptom: Dirty and dead.
Board looked like it had dirt and grass on the top board. Cleaned top board, replaced bad sockets and corroded ROMs at 12A, 10C, 12D, 6E, and 8I. Replaced bad CPU socket at 9A and tested. Board would not boot and had a hum on the audio output. Replaced dead Fujitsu 74LS138 chips at 13B and 9E and the remaining 74LS138 chips at 7G,13A, and 5D on the CPU board as a precaution. Board would boot but randomly crash. Replaced bad 74LS244 chips at 10A and 10B on the CPU board.
Board would boot and run but had graphic corruption that would come and go. Replaced both ribbon cables between the CPU and Video boards to fix that issue. Replaced 74LS393 at 8C and 74LS367 at 7C to fix the audio clock signal and the 74HC374 at 4C to fix missing data lines to the audio chips. Board now had sound but still had the hum. The audio chip at 6C worked but 5C had no output. Replaced bad 74LS08 at 8F controlling the audio chip enable lines to fix the hum issue and restore the harmonizing sounds generated by the second audio chip. Tested.
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Model: TMNT (Teenage Mutant Ninja Turtles)
Symptom: No sound. Won't move in all directions.
Board had severe corrosion damage.
Jumpered one bad trace to fix inputs for player 1 controls. Jumpered 1 bad trace to restore audio, but audio was garbled. Jumpered 9 more bad traces to fix audio issues. Tested
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Model: Teenage Mutant Ninja Turtles
Symptom: No sound
Board had input to the LM324 at B12 but no outputs. Replaced the LM324 and now had output from it but no audio from the board. Replaced the MB3771 audio amp chip to fix missing audio output. Audio played but was garbled. Replaced another LM324 and an LM358 OpAmp to fix the garbled audio issue and tested the board.
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Model: Simpsons Bowling
Symptom: CDR Error. Will not boot.
Burned CDR using the MAME files and tested. Drive would not read disc. Replaced drive and tested.
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Model: Roc'N Rope
Symptom: Obj 2 RAM error
Replaced 2114 RAM at F11 and tested.
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Model: Simpsons
Symptom: Dead. Stuck in reset
Board would try to boot then would be reset by watchdog. Customer stated ROMs tested good in a programmer.
Found the data bus on the CPU to be OK but on the other side of the 74LS245 at 12D the line for D2 was being held low causing the CPU to not be able to access the RAM at 11F. Removed the RAM at 11F and the Fujitsu 74LS245 ICs at 12D, 6H, 5H, and 4H. D2 was still held low. Removed the 74LS253 at 11B and D2 sprang to life. Installed replacement ICs for the Fujitsu logic and replaced the LS253.
The board booted, ran, and passed self test and the extended ROM tests, but failed the input test for Player 2 Right. Replaced the 74LS253 at 11A and tested the game.
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Model: Gyruss
Symptom: Popping and smoking.
Replaced shorted LA4460 audio amplifier IC at 6E and tested.
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Model: Teenage Mutant Ninja Turtles
Symptom: Audio corruption. Missing
Intro music stuttered repeatedly. This is stored on the Mask ROM at D5.
Installed missing 640KHz ceramic oscillator at E9 and replaced bad 74LS393 at D5. Tested.
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Model: Simpsons
Symptom: Dead. White screen.
Patched a corroded trace on the bottom of the board and replaced bad 74LS20 ICs that had a dead output on pin 6. Board booted but had multiple graphics problem and showed 4 graphics ROMs as bad.
Patched a trace on and address line of the graphics ROMs to fix 3 of the 4 ROM errors. Patched 2 traces on the data lines of a graphic ROM to fix the last ROM error.
Tested
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Model: Turtles in Time
Symptom: Garbage on screen. Fails self tests.
Board came in with a description including "damaged in shipping."
Address line A0 on the video RAM was dead. Board appeared to have been badly flexed when damaged. Reflowed SMT ICs at 7J, 11J, and 15J then tested.
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Model: Cadash
Symptom: Missing red. Graphics have wrong colors.
Cleaned edge connector to restore the missing read. Reflowed smeared solder shorting pins on a custom surface mount IC to fix graphics issue.
Tested.
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Model: Sunset Riders
Symptom: Dead
Replaced physically broken 32MHz crystal oscillator. Game would play but character and enemy sprites were partially missing. Straightened three bent pins on a custom IC and reflowed the smeared solder on them. Tested.
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Model: Simpsons
Symptom: ROM Error at 17C
Board would fail with a ROM Error below 4.85v. Replaced the ROM and tested the board down to 4.75v (the low end of TTL working voltage.)
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Model: Fisherman's Bait, Marlin Challenge
Symptom: NVRAM and Flash Errors
Reprogrammed the flash chips and replaced and socketed the NVRAM chip. The socket made the NVRAM interfere with the CD-ROM mount. The rubber anti-shock components were moved to another set of holes and the bottom plate installed 180 degrees out to accommodate this change. Reassembled the system and tested successfully.
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Model: Track & Field
Symptom: Dead, stuck in watchdog
Board arrived with the description "Board won't boot. Top board known good. New ROMs/sockets"
Replaced missing ribbon cable between the 2 boards then checked the CPU Address Bus with a logic probe on the 74LS241 ICs and found that Address Line A14 was stuck high. Checked the socket and it was stuck high. Checked the CPU pin and it was toggling. Replaced the bad (original) CPU socket and the game booted but had graphic corruption. Found that the Graphic ROMs at 11C, 13C, and 14C had weak programming and would read differently each time. Reprogrammed those chips successfully. The Graphic ROM at 12C was blank so it was programmed successfully.
The game would play but would sometimes reboot and had player graphic corruption at the start of the hurdles stage. Replaced a bad ROM at location 1A and reprogrammed the weak ROM at 5A. Tested successfully.
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Model: Simpsons
Symptom: Incorrect graphics shown for player characters
Address line A16 on pin 33 of the ROMs at 16L, 3N, 8N, and 12N, was shorted to ground through a 150 ohm connection internally on the ROM at 16L, damaging all 4 ROMs. Replaced all four ROMs and tested.
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Model: Kicker
Symptom: Missing parts. No audio, characters stuck at screen bottom.
Replaced missing 4460 audio amp, heatsink, and broken volume pot. Replaced a physically damaged 1000uf capacitor in the audio circuit and tested. Audio was now working, but characters were still stuck. Replaced 2 missing 74LS163 ICs to restore character placements and tested.
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Model: Punch Mania
Symptom: ERROR 31 (Flash ROM error)
Downloaded the CD-ROM image and burned a replacement CD. Flipped DIP 4 and booted the CD to reinstall the software and reprogram the Flash ROM chips. Replaced the RTC chip as it was initializing it on each boot. Tested.
Note: When replacing the RTC it requires either an image or a copy of the existing one. Since the existing one worked enough to boot the game, a copy of it was used. If the RTC isn't programmed the game will make a loud whooping siren sound and put a red box with text on the screen.
Note: The .chd image for this game is 229MB (240,194,278 bytes)!!! Most download sites have the wrong .chd image so keep searching for the proper 918xxb02.chd file.
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Model: The Simpsons
Symptom: ROM Error 16C and Sound RAM/ROM failure
Replaced corroded Program ROM sockets on 17C, 16C, 15C, and 13C. Replaced the sound ROM socket on 6G. Cleaned the ROM legs, reinserted them, and booted. Ran a ROM Test and found the ROM at 3N failed. Replaced the corroded socket on the chip at 3N and tested. The game would not play music and most sounds and it would randomly fail the self tests on the sound components at 6G and 7G. Patched an open trace on address line A6 on the sound RAM and played the game through to the end to test.
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Model: Jurassic Park 3
Symtpom: RTC Error
Replaced the RTC chip with a fresh one that was programmed with the code from the MAME archives. Tested.
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Model: Time Pilot
Symptom: No sound, possible sprite corruption
Replaced bad LA4460 sound amplifier IC and tested. Board would occasionally flake out on the background and motion of the enemy ships. Fixed a bent pin on a custom IC and tested.
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Model: Gyruss
Symptom: Dead
Replaced a bad 74LS157 at 9J. Game would then boot but had graphic corruption on enemy ships in attract/play modes and the earth on the title screen. Cleaned pins on 2 custom ICs and replaced the 082 and 083 as they had multiple broken pins. Cleaned the legs on the graphics ROMs and tested. Replaced audio amp IC to fix missing audio. Retested.
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Model: Jail Break
Symptom: Dead
Replaced bad CPU, 74LS138, and 74LS244. Tested. Board had graphic corruption. Replaced the ROM sockets and retested successfully.
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Model: Rush'n Attack
Symptom: Yellow characters visible outside the screen border
Video output wasn't being suppressed during horizontal retrace for the color yellow. This was seen during the title screen and during game play where you would get an advanced warning of characters about to enter the screen. Replaced a bad color PROM on the video output and tested.
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Model: Time Pilot
Symptom: Graphic corruption.
Replaced bad 74LS86 at E6 and tested.
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Model: Time Pilot
Symtpom: Black screen / no boot
Cleaned the custom chip and ROM legs. Patched broken pins on 2 chips, replaced the EPROM at F11, and replaced the socket on the custom at C12. Tested.
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Model: Track & Field
Symptom: Dead. No picture
Note: This was the unencrypted ROM model that has no schematics.
jammarcade.net has a version of the test ROM that will work on this board.
Replaced a shorted 74LS161 in the clock divider circuit to restore video. Replaced a shorted 74LS245 between the CPU and ROMs and another between the CPU and the RAM to fix boot problems. RAM tests passed using the test ROM, but board had horizontal lines on the screen on every other trace line. Replaced a shorted 2148 RAM in the video output circuit to fix lines on the screen. Replaced a dead 2114 RAM on the sound CPU to restore sound. Tested.
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Model: Time Pilot
Symptom: Graphic corruption and no sound
Board would intermittently boot or not boot on start up. Replaced the 3 program ROM socket and 2 corroded sockets in the graphics section. Cleaned the pins on all the socketed chips. Replaced a bad 2148 RAM to fix the graphics issue. Replaced bad sound ROM to fix the sound section. Replaced 2 leaking 1000uf electrolytic caps and tested.
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Model: Simpsons
Symptom: Graphic corruption in sprites
Replaced the 053246, 053247, and 053251 custom ICs. Graphic corruption improved, but worsened over time on the bench. Replaced 4 bad 74LS374 chips between the customs and the Mask ROMs for sprites. Tested. Graphic corruption returned as a 5th 74LS374 failed. Went ahead and replaced the last 4 to finish out replacing all 8 of the 74LS374 chips and retested. The failed ones were all SGS brand.
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Model: X-Men
Symptom: Dead
Jumpered 3 bad traces and tested. Board would then boot but freeze after passing the self tests and reboot. Jumpered a 4th bad trace between Data Line D7 and the hybrid sound module to finish the repair. Tested.
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Model: Hyper Sports
Symptom: Dead. Humming noise from speakers.
Cleaned pins on the customs on the video board. Replaced multiple dead Fujitsu 74LS244 chips at A1, B1, G1, J1, D6, H11, H12, and C19. Board booted with corrupt graphics and humming noise from speaker. Replaced multiple bad Fujitsu 74LS157 chips at D15, D16, C17, D17, and E17 to fix player sprites. Replaced a bad 74LS157 at G7 to fix background issues. Replaced bad 74LS138 at C18, bad 2114 RAM at C16, and 74LS08 at B2 to fix audio hum and restore audio. Board would play, but the speech was playing far too fast. At this point the board died. Replaced bad 74LS138 at H14 to bring the board back, but the speech was now not only too fast, but playing the wrong samples. Replaced bad 74LS393 at A3 to fix speed issue and bad 74LS374 at C14 to fix the sound sample issue. Tested.
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Model: Turtles in Time
Symptom: RAM Errors
Replaced 2x 2k x 8 SRAMs at 13D and 14D and 8k x 8 at 18H to fix the RAM errors. Board booted but had corrupt sprites and graphics. Replaced 2x ROMs at 3L and 7L plus partial reflow of 7J and 3J to fix that. Inputs tested stuck. Replaced a broken 005273 custom resistor/capacitor pack.
Game would then boot but had bad sound. Replaced the PAL at 5D, 053250 custom, corroded Sound ROM, and multiple shorted gates: 74ALS32 at 15D, 74LS08 at 18E, 74F74 at 19E, 74LS04 at 19F, 74ALS04 at 18F, 74F74 at 14G, and 74LS74 at 5F.
Tested.
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Model: Turtles in Time
Symptom: Dead, flashing white screen.
Game was stuck in watchdog. Replaced a bad 04 ROM at 10E. Tested Work RAM out of circuit. Found floating pin 1 of the 053997 Address Decoding PAL at 5E. Patched bad trace and tested. Game played but had no sound. Found floating pin 17 on the 053260 sound custom, which is what tells the chip to latch the data from the main CPU. Patched the trace and had audio signals coming out of the YM2151 and sound DAC, but no audio from speakers. Pulled the audio heat sink and discovered the amplifier chip soldered in backwards. Removed and reinstalled the audio amp chip to restore sound and tested game.
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Model: Hyper Sports
Symptom: Garbage on screen. No sync.
Cleaned very dirty edge connector and reseated one custom IC with tarnished legs. Board booted with vertical lines on screen. Replaced missing 74LS244 at C19. Game booted and played but with some garbage on screen. Replaced bad RAM at G9 and tested.
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Model: Circus Charlie
Symptom: Blocky graphics during trapeze section.
Cleaned corroded ROM legs and tested.
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Model: Martial Champions
Symptom: Stuck in boot loop
Hybrid module was cracked, causing the sound check to fail and self test to fail/reboot, putting the board in an endless loop.
Replaced the hybrid module with one created by user cwispy of the Aussie Arcade forum. Board would boot/play, but had color glitches in the background graphics that would change when 3 customs were tapped. Reflowed customs at 8J, 14J, and 14K to fix background graphic glitches. Cleaned excess solder from the JAMMA edge connector and tested.
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Model: X-Men
Symptom: Stuck in test mode reboot
Board had multiple pulled traces from an attempted repair of the hybrid module.
Pinned out the hybrid module, patched traces, installed a new hybrid from Aussie Arcade forum member cwispy (VERY nice quality!), patched 2 more traces to the hybrid, patched a trace from the CPU to the sound ROM, and tested.
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Model: X-Men
Symptom: Dead. Missing parts.
Board was previously a donor to fix a Simpsons and other PCBs.
Installed missing 053246, 053247, and 053251 custom ICs, 1000uf @ 15v capacitor, LM358 audio amplifier IC, and tactile test switch. Installed an aftermarket sound hybrid using chips from a donor Run-and-Gun PCB. Tested.
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Model: Roc'N Rope
Symptom: Left and Right control issue
Move left, it moves left. Move right, it moves left. Replaced bad 74LS253 at D4 and tested. Replaced 2 physically damaged 1000uf capacitors and retested.
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Model: Track & Field
Symptom: Missing backgrounds
Replaced 3 sockets and 1 rotted legged EPROM. Cleaned the legs on the other 2 EPROMs and tested.
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Model: Track & Field
Symptom: Dead
Replaced 2 bad Fujitsu 74LS244 chips that had one dead output each. One was buffering address lines on the CPU and the other signals to the top board. Game booted but had no sound. Replaced a bad 2114 in the sound circuit and had working sound, but very low audio. Recapped the audio section and replaced the audio amplifier IC. Tested.
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Model: Gyruss
Symptom: Dead
Cleaned the legs on the custom ICs and tested. Game tried to boot, but failed. Installed the Gyruss test ROM and found ROM 2 on the main CPU was bad. Cleaned the legs on the Program ROMs and fixed that error. Next was the shared RAM at 17C and the Konami 1 CPU failure. The RAM was good. Cleaned the custom CPU's legs. Replaced the CPU socket, the Fujitsu 74LS138, and one of the 74LS157s that showed a bad pin on the logic comparator. Still failed. Replaced multiple Fujitsu 74LS245 ICs in that circuit and one bad 2114 RAM. Game booted but randomly lost sound. The SOUND ON signal was not making it to the top board. Replaced bad ribbon cable and tested.
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Model: Time Pilot 84
Symptom: Dead
Game came up with flickering garbage on the screen. The way it flickered appeared to be an open trace issue somewhere. Cleaned all the socketed chip legs and replaced a Fujitsu 74LS00 with dead outputs. Flickering gone, but the system still would not boot. Replaced three damaged caps in the reset circuit and noticed the 2 CPUs were socketed backwards - they face the opposite direction from all the other chips on the PCB. Board booted but had sprite issues with placement and appearance. Replaced a broken socket and a ROM with a detached ground leg in the sprite section. Appearance was fixed, but motion placement was off. Found and patched 4 gouged traces and tested the game.
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Model: Time Pilot
Symptom: Dead
Replaced 1 082 and 2 083 customs and their sockets because of pin rot. Tested. Replaced 2 1000uf caps on the audio board, cleaned the edge connector, and retested.
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Model: Aliens
Symptom Dead
Board had a note "works sometimes"
Fixed a gouged trace under the custom CPU and the board would boot but video was unstable. Cleaned the edge connector to fix the video issue. Board would boot to a RAM error and reboot until it was satisfied the RAM was OK, about 3 or so cycles. Resoldered one side of a custom chip to fix popped legs and the RAM error. Ran the extended self tests - all mask ROMs showed good, but the coin 1 input was stuck on. Replaced a bad 74LS253 and tested the game by playing through to the end.
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Model: Jungle Hunt
Symptom: Missing sounds
Cleaned the top board and ROM board. Replaced 5 40-pin sockets, 4 sound chips, and 1 Z80 CPU that had corrosion damaged legs. Tested.
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Model: Kick Start Wheelie King
Symptom: Dies during game play
Verified issue. Reprogrammed the program and graphics ROMs and tested.
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Model: Track & Field
Symptom: Dead. Garbage on screen.
Board would not boot Shoestring's test ROM. Checked CPU, customs, and first program ROM legs and all were clean. Inspected the PCB and found a solder smear between 2 vias shorting 2 data bus lines to the CPU. Fixed the solder smear and tested the game. It would play but played incorrect music and had no digitized audio. Replaced bad ribbon cable to fix the incorrect music and patched 2 damaged traces to restore the digitized audio. Cleaned the edge connector and tested.
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Model: Vendetta
Symptom: Fails self tests on boot
Game failed sound subsystem tests. Cleaned the edge connector, patched broken trace, and tested.
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Model: Track & Field
Symptom: Line and blocks in graphics
Cleaned the background and sprite ROM legs and tested.
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Model: Time Pilot '84
Symptom: Dead
Board had a white screen with little flickers down the left side.
Cursory exam found 3 of the 4 program ROMs toast- rodent pee. Replaced 4 sockets and 3 program ROMs. No change. CPUs were dead and had no activity on the clocks. Replaced Fujitsu 74LS04s at 13F and 13H. Had clocks but no read/write line activity. 2 new 68A09E CPUs. Still the same, but now had activity on proper CPU lines. No activity on the other side of the 74LS245s at 11J and 11F. Replaced the 74LS367 and LS244 on the address lines of the main CPU as they were rodent damaged. Now had activity, but no booting. Replaced bad 74LS02 at 15F and started hunting down dead gates. LS04 at 6F, LS153 at 3E and 3F and now had garbage on the screen instead of a white screen.
Replaced bad RAMs at 4F, 8B, 8C, 9B, and while the one at 9C was OK, I replaced it as well. The data bus was stuck on the RAM at 9F so I replaced the LS245s at 10F and 10G. Still no boot. Found a dead trace between the LS138 at 12J and the LS139 at 9F and patched it. Board tried to boot but had no text/backgrounds. Replaced LS377 at 2G. Board now tried to boot but failed the Sub CPU tests. Replaced bad ROM at 10E. It wouldn't reprogram. Game booted but had no sprites. Replaced bad 74LS377 at 12D. Game booted and had sprites but would continuously count up credits. Replace 74LS245 at 1B. Plays now, but has vertical lines in some sprites.
Board died during burn-in. If the main CPU data bus was touched with a logic probe it would try to boot. This one was a bitch and all the chips on the data bus were good. Looked for more dead gates, none were found. Started checking Fujitsu logic with an ohmmeter and found 86 ohms to +5v on pin 15 of the 74LS139 at 9G. Replaced it and the 74LS138 that drove it at 12J. Checked the 74LS139 at 16D and found a pin that measured 1.6K to +5v. Replaced it and that fixed the lines in the sprites.
Looked at the sound board. It had CPU activity, but no output. Removed the LA4460 sound chip to discover it was installed backwards by a prior tech. Replaced the amp chip and the 3 electrolytic caps in the audio section and played a few games.
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Model: X-Men
Symptom: Errors on boot
Board had 4 errors, all related to the sound subsystem. Replaced the sound hybrid module with an aftermarket one and tested.
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Model: X-Men
Symtpom: Low audio and static
Replaced the hybrid to find now has audio, but still has very bad static. Traced it back to the output of the original DAC on the hybrid module. Replaced the DAC and tested.
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Model: Simpsons
Symptom: Corrupt graphics
Tested and found no signal on pin 8 of one of the 74LS374 ICs. Patched the dead trace and tested.
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Model: X-Men 6 Player
Symptom: No sound, no picture from JAMMA connector
Removed solder globs from JAMMA connector and cleaned the edge connector. Tested and video was OK. Replaced bad sound hybrid and retested.
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Model: Lethal Enforcers
Symptom: No sound
Replaced sound hybrid with an aftermarket one and transferred the custom and DAC ICs over. Tested.
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Model: Simpsons
Symptom: Dead, stuck in watchdog reset
Board had some corrosion on chips.
Found that the trace from the Custom PROM at 11C pin 17 to the 74LS20 at 9D was open. Patched trace. Board would then boot but had an error for the IC at 12C (EEPROM.) Replaced bad 74LS174 at 10D, a Fujitsu chip with floating outputs. Board then booted to a solid white screen. Replaced all 4 corroded Program ROM sockets and cleaned the ROM legs before reinsertion. Tested.
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Model: X-men 6 player
Symptom: Low audio
Replaced sound hybrid module with an aftermarket one. Tested.
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Model: Time Pilot
Symptom: Sparkling sprites and clouds.
Replaced bad ROM 6 and tested.
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Model: Lethal Enforcers
Symptom: Crackling audio
Replaced sound hybrid module with an aftermarket replacement and tested.
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Model: Hyper Sports
Symptom: Flickering text, logo, and garbage on screen during vault section of attract mode.
Replaced bad 74LS153 at J7 and tested.
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Model: Track & Field
Symptom: No sound
Note: cust also wanted battery replaced.
Replaced a dead sound amplifier IC and tested. Replaced the soldered in battery with a coin cell and holder. Retested. Turned off DIP for high-score reset and retested.
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Model: Lethal Enforcers
Symptom: No Audio
Replaced bad audio hybrid module. Replaced bad audio DAC chip. Tested.
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Model: X-Men
Symptom: Low audio
Replaced bad hybrid module, 3 caps, LM358, and a bad audio DAC chip. Tested
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Model: Lethal Enforcers
Symptom: No audio
Replaced audio hybrid module and tested.
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Model: Metamorphic Force
Symptom: Corroded sound hybrid
Replaced sound hybrid and tested. Replaced failed DAC and retested.
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Model: Bucky O'Hare
Symptom: Corroded sound hybrid
Replaced sound hybrid and tested.
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Model: X-Men
Symptom: Corroded sound hybrid
Replaced bad sound hybrid and tested.
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Model: Cowboys of Moo Mesa
Symptom: Corroded sound hybrid
Replaced bad sound hybrid and tested.
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Model: Cowboys of Moo Mesa
Symptom: Low audio. Crackles
Replaced bad sound hybrid module and tested.
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Model: Contra
Symptom: Error 1F, corrupt video
Replaced bad 74LS157 at 5G that had dead outputs. Replaced 2 100uf caps in the audio section that were popped. Replaced a bad 330uf filter cap on the +5v line that had popped. Tested.
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Model: GI Joe
Symptom: No sound
Replaced faulty sound hybrid with an aftermarket one. Tested.
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Model: Super Contra
Symptom: Dead. Garbage on screen. No sync.
Replaced 2 dead Fujitsu 74LS74 ICs that had no output. Replaced 3 dead Fujitsu 74LS153 ICs that had dead outputs. Replaced a shorted 7407 buffering the sync output. Replaced a bad custom IC as the Sync output pin was shorted. Board attempted to boot but would fail. Still had garbage on screen, but now had sync. Replaced 2 corroded program ROM sockets and cleaned the corroded ROM pins. Board would boot but was stuck in a loop with repeating garbage patterns like it was failing a self test. Tested the 4 16-bit Mask ROMs - 3 were bad. Replaced the 3 Mask ROMs and the board booted to a corrupt, but readable screen with multiple self test failures. Replaced a bad Fujitsu 74LS153 with chattering outputs and a bad 2018 SRAM. Board would boot but had corrupt backgrounds, no sprites, and no sound. Replaced corroded sound ROM and its socket. Board now had sound. Replaced the other 3 graphics processing customs and the board now had backgrounds but corrupt sprites. Replaced the last Mask ROM with an EPROM to fix the remaining issues and tested the PCB.
The last Mask ROM replaced checksummed properly in the EPROM programmer, but would not operate at speed.
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Model: X-Men
Symptom: Very low audio
Replaced hybrid module with an aftermarket one and transferred the custom and DAC chip over. Tested.
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Model: Cowboys of Moo Mesa
Symptom: No audio. Popping noise from speaker.
Replaced hybrid module with an aftermarket one and transferred the custom and DAC chip over. Tested.
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Model: X-Men
Symptom: No sound
Replaced sound Hybrid. Tested. Replaced DAC. Tested.
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Model: X-Men
Symptom: No sound
Replaced hybrid module and tested.
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Model: X-Men
Symptom: No sound. Graphic corruption
Replaced hybrid module and tested. Replaced bad DAC and retested audio successfully. Checked the 053246 custom and found pin 83 shorted. Replaced the custom and all four mask ROMs as they all failed with Pin 36 errors on read attempts in the programmer. Tested. Removed 2 wire wrap sockets that were sticking up off the PCB. Cleaned and inspected the PCB then installed standard dual wipe sockets. Cleaned the chip legs and reinserted them in the sockets. Replaced an 18ga wire jumper with a 30ga Kynar jumper. Tested.
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Model: X-Men
Symptom: No sound. Missing hybrid module
Replaced missing hybrid module using ICs from a donor PCB. Tested.
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Model: Lethal Enforcers
Symptom: Bad sound
Replaced hybrid module and tested. Replaced bad DAC and retested.
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Model: Lethal Enforcers
Symptom: No sound
Replaced shorted audio amp IC, hybrid, and DAC. Tested. Board failed 2 mask ROM tests. Installed 2 Kynar jumpers to fix. Replaced 2 physically broken filter caps and tested.
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Model: X-Men
Symptom: No audio
Replaced sound hybrid module with an aftermarket one and tested.
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Model: Lethal Enforcers
Symptom: Audio issues
Replaced bad sound hybrid module and DAC chip. Tested.
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Model: Hyper Sports
Symptom: Corrupt graphics, starts game before you can enter name, bad sound pitch
Replaced four corroded sockets on the video board to fix graphics issues. The other two issues were on the CPU board and were hard to track down. The input resistors were good, the 74LS253 input chips were replaced. No change. Replaced the Fujitsu 74LS374 latching data from the main CPU to the sound CPU. No change. Walked down the address decoding path and replaced 2x 74LS138 and 1x 74LS139. No change. Replaced the 74LS08 at A2 to fix the board. This chip controlled the enable line on the 74LS245 latching data to/from the CPU board to the Video PCB. It was causing the LS245 to put spurious data on the main CPU bus causing the CPU to misread control inputs and causing incorrect sounds.
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Model: X-Men 6 player
Symptom: Audio problems
Cleaned off excess solder blobs from edge connector and repaired the burnt +5v connection. Tested.
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Model: X-Men
Symptom: No audio
Note: Board was sent in without the hybrid and with the custom and DAC taped to the PCB.
Removed 3 broken pins and desoldered 3 plated thru holes from where the hybrid was removed. Straightened multiple bent pins on the QFP custom chip and installed it on a replacement hybrid. Patched a pulled trace to the hybrid. Replaced the bad audio DAC. Replaced 6 caps in the audio section and 2 filter caps on the supply voltages. Tested.
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Model: Super Space Invaders '91
No controls
Cleaned edge connector and tested.
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Model: TMNT
Symptom: Dead
Board had some very hot chips on it that burned my finger.
Used a thermal camera to ID shorted chips. Replaced 74ALS151 at F6, F7, G3, G4, G5, and G6. Replaced every RAM: G27, G28, F16, F22, F23, G8, and both Work RAMs. Replaced the 74LS245 at E24 and F24. No boot, but no more glowing chips. Found no clock on the 68000 CPU and its pin was shorted to +5v by 23 ohms. Replaced a bad LS23 at F9 and LS04 at H18. CPU Clock was restored and game tried to boot, but failed with RAM errors. Replaced a bad LS157 at G25 and the board then passed all self tests, booted, but had some graphics corruption. Self Test showed the Mask ROMs at H4, H6, K4, and K6 as bad. Found a shorted pin on those mask ROMs - pin 5 was stuck high and shorted to +5v by 338 ohms. Replaced failed ALS151 at F5 to finish the repair. Burned in the PCB and then played it through to the end.
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Model: Sunset Riders
Symptom: Dead. Corrosion damage.
Patched 8 data line traces between a custom IC and video RAM. Board would try to boot but had garbage on the screen. Reflowed another custom IC to restore connectivity to another set of RAM for 2 address lines. Patched 2 traces carrying address lines between two customs. Tested.
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Model: X-Men 6 player
Symptom: No audio
Replaced sound hybrid and tested.
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Model: X-Men
Symptom: Stuck in reset
Board had an attempted replacement of the hybrid with a 3rd party module.
Low ROM was one set of pins off in its socket. Removed and reinstalled the ROM. Still no boot, stuck in reset. The hybrid module had multiple solder shorted pins on the PCB. Unplugged the hybrid module and reflowed pins on the PCB to remove shorts. Board would boot to sound chip errors. The custom chip and DAC were misregistered on their solder pads. Removed the chips, cleaned everything up, and reinstalled them on the module. Desoldered the pins on the module, cleaned the PCB / pins, and resoldered them as they had some kind of oily residue on them. Plugged the hybrid in and tested - sound chip errors during self test. Found a broken trace from pin 62 of the hybrid module to the CPU Address bus. Installed a kynar jumper and tested successfully.
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Model: Crime Fighters
Symptom: Dead. Nothing on screen.
2018 RAMs at F14, F15, and J3 were getting finger blisteringly hot and tested bad out of circuit. Socketed and replaced them. Tested.
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Model: X-Men
Symptom: Distorted sound
Note: customer installed their own hybrid replacement module
Resoldered headers to hybrid module and sockets to PCB. Reflowed the custom IC and DAC on the replacement hybrid module. Checked traces to the module and found pin 1 was not connected to +5v. Jumpered connection with Kynar wire and tested.
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Model: X-Men
Symptom: No sound
Replaced hybrid module with one customer supplied. Replaced 3x 1000uf@16v, 1x 10uf@16v, and 1x 470uf@16v capacitors. Replaced bad DAC. Tested.
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Model: Lethal Enforcers
Symptom: Physically damaged.
Customer removed the hybrid and damaged multiple traces
Removed solder blocking several holes. Inspected board. Removed the Sound SRAM and multiple wire pin jumpers. Cleaned up PCB and installed a socket and new SRAM. Installed a missing 4.7K resistor pack. Installed new hybrid and jumpered 4 dead traces. Tested.
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Model: Lethal Enforcers
Symptom: Bad audio
Replaced hybrid module with one that was customer supplied. Tested.
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Model: Road Fighters
Symptom: Dead
Replaced dead Konami-1 CPU, cleaned ROM legs, and installed a coin cell holder and battery. Tested.
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Model: Road Fighters
Symptom: Dead
Cleaned up battery leakage. Replaced 2x 74LS244 chips on the data bus. Replaced corroded ROM sockets, RAM sockets, and the CPU socket. Patched a damaged power trace to the battery backed RAM. Replaced 74LS74 on the Interrupt circuit and a shorted LS253 keeping the data bus down. Installed a coin cell holder and battery. Cleaned sound ROM legs. Moved to the video PCB and removed 4 poorly installed sockets on the 2114 RAM, cleaned up the PCB area, and installed new sockets. Replaced bad 6116 SRAM at G10. Tested.
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Model: Time Pilot
Symptom: Dead
Replaced shorted tantalum capacitor and tested. No audio. Replaced audio amplifier IC and tested.
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Model: X-Men
Symptom: No sound
Replaced audio hybrid and DAC. Tested.
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Model: Sunset Riders
Symptom: Sprite issues. Fails Mask ROM test.
Reflow custom IC at 3J to fix cracked solder issue. Tested.
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Model: X Men
Symptom: Sprite issues. Fails Mask ROM test.
Patched damaged trace from custom to Mask ROM address line. Tested.
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Model: Bucky O Hare
Symptom: No audio
Replaced audio hybrid and DAC chip. Tested.
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Model: X-Men
Symptom: Sound subsystem Errors on start up. Will not play game.
Replaced bad sound hybrid module and tested.
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Model: 6-player X-Men
Symptom: Low audio
Replaced defective hybrid module with a 3rd party one and tested.
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Model: X-Men
Symptom: Dead
Board read 3.9 ohms to ground and had 2 address lines shorted to ground. It was also missing a 74LS367 IC.
Replaced missing 74LS367 and replaced bad 68K CPU. Board looked like it was booting but had a light blue screen. Replaced one dead Color RAM and a bad 74LS273 latch in the color output section. Tested.
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Model: Sunset Riders
Symptom: Dead
Board was sprayed down with something oily that attracted a lot of dirt.
Cleaned PCB. Board booted with a RAM error. Replaced a 2K x 8 SRAM and its socket. Patched 2 dead traces to that RAM chip. Tested. Board booted but with graphical glitches and no audio. Replaced 2 bad volume pots to restore audio. Reflowed several pins with cracked solder and replaced a bad Mask ROM at 16K. Cleaned the Program ROM legs to fix random lockups. Tested and burned in.
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Model: X-Men
Symptom: Bad sound
Replaced the sound hybrid & tested. Replaced bad DAC and retested.
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Model: Cowboys of Moo Mesa
Symptom: Bad sound
Replaced the sound hybrid and a physically damaged 1000uf @ 16v capacitor. Tested.
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Model: Simpsons
Symptom: Dead
Board had the LS367 buffering Video Sync output and CPU Reset replaced. It also had the 74LS245 data bus latch replaced.
Board had no sync, was stuck in watchdog reset, and the CPU was dead. Checked the CPU Reset pin and found it stuck high. Checked the input on the LS367 and found it dead. Traced it back to the 052109 custom. Checked the paired custom (051962) chip's sync output and it was stuck at +5v. Replaced both the 052109 and 051962 customs and had CPU Reset and proper Sync. Board was still stuck in watchdog. Found the far side of the data bus from the CPU, across the LS245 was shorted on D4 to ground by 7 ohms. Replaced shorted 74LS253 control input chip and tested. It was shorted on the Player 4 Switch 1 input. Tested.
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Model: Lethal Enforcers
Symptom: No audio
Board had the hybrid module already replaced by a 3rd party.
Replaced a bad custom audio IC and DAC. Tested.
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Model: Lethal Enforcers
Symptom: Missing parts
Installed missing 24MHz crystal oscillator and 4 position DIP switches. Replaced broken 4.7K resistor network on main CPU. Replaced Hybrid Module and missing audio heat sink. Patched 3 gouged traces and tested.
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Model: X-Men
Symptom: Dead
Board had attempted repairs and replacement hybrid done.
Removed badly installed audio custom off the replacement hybrid, straightened 3 pins on it, and reinstalled it properly. It was poorly registered on the pads causing a short across the data bus. Reflowed the DAC IC and 4 SMT components that were not properly on their pads. Replaced missing 4.7uf tantalum capacitor in audio circuit and resoldered several parts that were left desoldered by the last tech. Reset EEPROM to factory defaults, tested Mask ROMs, and tested the game.
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Model: X-Men
Symptom: "Sprite chipset issue"
Board had attempted repairs done.
This was an odd one. The lower left part of the screen, about 2" wide and half the screen tall would flicker in and out. Everything in that section of screen would be covered by a white box when playing the game and by a black box when in test mode. Appeared to be in the section of the chipset where sprites, backgrounds, and text overlays were assembled before going to the screen (053251 chip.) Problem would disappear when the board warmed up.
Used some cooling spray and found the sprite chip 053246 to be bad. Replaced the 053246 and tested. Board would randomly crash. Partially reflowed the 052109, 051962, and 053251 chips where someone had poorly attempted to reflow before. Tested the Mask ROMs then tested the game.