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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 04, 2014, 08:08:42 PM
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Model: Mario Bros
Symptom: No sprite graphics
Board would play blind, show text, and floors but had no moving graphics, characters, pipes, or title graphics. The Video EPROMs had no activity on the address or data lines, except A0-A3. Traced it back to the input edge of the Video PC Board. Data was coming into the 74LS245 but not out from it. The enable and direction lines were stuck high. Problem was on the CPU board.
Tracked the signals back to the CPU board: "OBJ WR*", "OBJ RD*", and "OBJ RQ*" were all stuck high. Replaced the 74SL138 at 3B to no effect. Tested the PROM at 5B by substitution even though the signals looked good. All the signals to the 3A, 3B, and 4A chips looked good except for the MREQ* signal. It was pulsing, but not the same as a known working board. This signal came from the Z80A DMA controller at 5D. The "BUS REQ*" and DAI* signals lines between it and the CPU were stuck high. Replaced the DMA Controller IC to repair the board.
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Model: Popeye
Symptom: Dead
Replaced bad CPU and cleaned corroded pins on 2 chips on the CPU board. Tested.
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Model: Popeye
Symptom: Dead
Swapped out the Rev 1 EPROMs with Rev 2 EPROMs from a parts board. The EPROMs read good but at least 1 would not work at speed. Replaced a bad AY-3-8910 IC at 7L to fix an audio and I/O problem.
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Model: Donkey Kong 3
Symptom: Bad colors, garbage on screen, and screen scrolled.
Repaired broken legs on the horizontal adjustment pot and replaced a cracked vertical adjustment pot to fix the scrolling screen problem.
The video board had a corrosion problem on it. Replaced and socketed the 74LS373 at 3k, the 74LS157 at 3L, the 74LS157 at 3M, the EPROM at 3M, the EPROM at 3P, 74LS174 at 2N, 74S163 at 1N, and the 74LS267 at 1P. Cleaned the corroded pins on the PROM at 2N and replaced the bad socket. Now the video garbage problem was solved.
The bad colors would come and go when the board was tapped or flexed. Replaced a bad socket on the PROM at 1D on the CPU board then tested the game.
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Model: Donkey Kong 3
Symptom: Dead. Garbage on screen
The lower 8 address lines and the 8 data lines were garbled. Replaced a bad 74LS374 at 5F, 74LS244 at 7A, and 74LS240 at 2M to fix the problem.
Game would play but was missing some sounds. The RP2A03 at 5J showed no activity. The RP2A03 at 5J, and the EPROM for it at 6H tested good by substitution into another board. Replaced a bad SRAM IC at location 6F to fix the sound.
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Model: Donkey Kong
Symptom: Dead, garbage on screen
Replaced the EPROMs at 2A and 2E. Board worked but was missing audio.
Reseated the EPROMS at 3H and 3F to fix most of the audio. The walking sounds were missing. Replace broken capacitor C22 and missing capacitor C26 to fix the walking sounds.
Reseated the EPROMs on the video board to fix a horizontal line issue and played a few games to test.
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Model: Eight Ball Action
Symptom: Dead
Board is a conversion for Donkey Kong Jr by Seatongrove Ltd.
1MHz clock is missing. Clock circuit is working fine. Replaced bad board interconnect ribbon cable. Board now had video but no sync. Fixed broken legs on the horizontal and vertical adjustment pots. Tracked sync problem to card edge connector. Cleaned edge connector to repair.
Board now had sync but had garbage on the screen. Reseated the program EPROMs and it booted. Replaced 3 program EPROM sockets and 2 other EPROM sockets on the CPU board to finish the repair.
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Model: Donkey Kong Jr.
Symptom: Dead, Garbage on screen.
Replaced an 8035 CPU with the proper Z80A CPU. Game would boot but had garbage on the screen and no sync. Repaired the broken horizontal and vertical adjustment pots to fix the sync issues. Replaced a bad board interconnect cable to fix the garbage problem and tested the game.
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Model: Donkey Kong Jr.
Symptom: Low audio
Replaced C13 and C161. Tested.
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Model: Donkey Kong, Jr.
Symptom: Plays the game start sound in a constant loop
Replaced bad 74LS174 at location 3D. Tested.
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Model: Mario Bros
Symptom: Graphic corruption
Replaced bad 74LS283, 74LS244, and 74LS273. The 283 was causing problems with position on the screen and 74LS244 and 273 were causing a data line to be stuck on one of the 2148 RAM chips, causing problems with graphic corruption and position on the screen. Tested.
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Model: Mario Bros
Symptom: Dead. Garbage on screen.
Board was dead. No activity on the Z80 address or data lines. Reset worked and clock was correct. When CPU would come out of reset there were NO pulses on the address or data lines. CPU chip tested fine. Replaced bad Z80A-DMA chip and tested.
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Model: vs. Excitebike
Symptom: Dead
Every EPROM was blank on the board! Reprogrammed 6A through 6D and 8B. Replaced bad EPROM at 8A. Board was dead and D1 was stuck. Replaced bad RAM at 6E and as a precaution, the same Fujitsu RAM at 1E. Tested.
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Model: vs. Super Mario Bros
Symptom: Dead.
Board had a solid greenish brown screen on startup. The RP2A04 IC on the unpopulated side of the board died. Replaced the IC with a simple jumper between pins 30 to 38 in the socket and tested.
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Model: vs. Super Mario Bros
Symptom: Partial garbled graphics and will not recognize any inputs
Repaired bad traces to the enable pins on 7P, 8P, 8M and 8N to fix inputs. Patched bad trace on data line D1 between the ROMs at 8A and 8B. Tested.
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Model: Mario Bros
Symptom: Missing graphics, corruption on screen
Board worked, but had no moving graphics and displayed text ont he top quarter of the screen. Replaced bad Z80A-DMA chip and tested.
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Model: Super Punch Out
Symptom: Poor colors and corrupt display on upper monitor.
The upper monitor was missing blue and would repeat the left most part of the screen across the entire screen several times.
Replaced bad PROM in the output circuit to fix the color issue and replaced a bad 74LS161 to fix the graphics issue. Tested.
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Model: Punch Out
Symptom: Dirty, missing parts.
Cleaned CPU board. Replaced missing CPU and missing 6264 SRAM IC chip. Fabricated 1 new ribbon cables for the board and installed them. Board would not boot. Replaced bad program ROM and tested. Board would boot and try to play but was missing players. Replaced 2 74LS163 chips with rusted and tarnished legs that weren't making good contact with their sockets and 2 bad 74LS163 chips on the video board. Tested. Replaced missing hardware and retested
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Model: Punch Out
Replaced CPU, 2 corrosion damaged 74LS240 ICs, 1 corrosion damaged DIP switch, fabricated 2 new ribbon cables, and tested. Board had scrambled images on the screen. Replaced 4 bad 2564 EPROMs on the BAK board and 1 74LS161 IC. Tested. Fabricated replacements for 2 of the board fasteners and retested.
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Note: Punch Out Revisions and ROMs
When repairing Punch Out and Super Punch Out boards it's important to note there are 2 different ROM types that could be on the boards: 2763 or 2564. These chips are NOT interchangeable and the code they use is not interchangeable.
If you use the wrong code on the 2564 chips you will have incorrect colors and scrambled graphics on the screen.
Also the PROMs on the video output come in 2 different types and are distinguished by their labels: Pink or white. The Pink labels are known for fading so you may have to read a good PROM's contents to verify which type you are dealing with on the board when replacing a bad video output PROM.
If the boards are working I've been able to swap a -01 CPU board onto a -02 Video and -02 BAK boardset; a -02 CPU board onto a -02 Video and -01 BAK; and a -01 CPU onto a 02-Video and -01 BAK with no apparent issues.
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Model: Donkey Kong Jr.
Symptom: Random crashing
/RESET line was not staying high. Replaced bad 74LS04 at P1 and tested. Board would sometimes crash and other times on the key level would sometimes pass through the keys without raising them. Replaced Z80 CPU socket and tested.
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Model: Punch Out!
Symptom: No audio
Replaced bad sound CPU with one harvested from a Nintendo NES system and tested.
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Model: Donkey Kong
Symptom: Dead. Lines on screen.
The lines on screen looked like an old Atari 2600 when you powered it up with no cartridge.
Replaced 2 dead 74LS174 ICs to get rid of the lines. Board would not boot. Cleaned the program ROM legs, replaced ICs with stuck outputs at 4D, 1C, 1B, 2B, 1A, 3D, 4D, 5F, 5H, and 8F. Replaced 8035 CPU that had 2 broken legs.
Board would now boot but crash upon starting game and when data line D7 was touched with a logic probe. Replaced 6A, 6B, and 2 bad RAMs at 4C and 4B.
Board would now play but characters and moving objects were missing pieces and had repeating graphic elements. Replaced bad 74LS283 chips at 8J and 8R on the video board.
Tested game.
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Model: Donkey Kong
Symptom: Incorrect digital sounds and constant analog sounds.
Replaced bad 74LS367 between the program CPU and sound CPU to fix the digital sound issue. Replaced bad 74LS05 driving the analog sounds to fix that section.
Tested.
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Model: Donkey Kong
Symptom: Random crashing
Cleaned corroded chip legs on the 4 program ROMs and 2 sound program ROMs
Tested.
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Model: Mario Bros
Symptom: Dead. Missing parts.
Replaced the missing Z80A CPU, 10uf cap at C1, and 220 ohm resistor at R44. Replaced broken horizontal and vertical position adjustment pots. Replaced broken socket on the ROM at 7F. Replaced broken socket on the PROM at 5B and replaced the missing PROM at 5B.
Tested.
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Model: Donkey Kong
Symptom: Girders going uphill, barrels going up and downhill. High Score table garbled.
Broke Fluke 9010A out and determined RAM at 74FF to 7FFF was bad. Replaced RAMs at 2R and 2P to fix graphic and score table issues.
Board now worked but all moving graphics were off position on the screen. DK, barrels, fireballs, Pauline, and Mario were all walking on the bottom surface of the girders isntead of the top. Checked the 74LS283 adders and they were working properly. Noticed that when the FLIP signal was activated that Mario was on the correct surface. Replaced 74LS32 at 5J to fix the problem. Pin 8 had incorrect outputs.
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Model: Donkey Kong 3
Symptom: Dead. Missing parts.
Replaced broken H-Pos and V-Pos pots on the video board. Replaced broken HD10136 ECL counter at 1E and missing 74LS373 at 6H on the video board. Replaced missing 74LS138 and patched a damaged trace at 3A on the CPU board. Reseated a color output PROM to fix missing color issue, installed missing board standoff, cleaned the board edge connector to fix coin input issues, and tested.
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Model: Donkey Kong Jr. / 8 Ball Action
Symptom: No vertical sync
Replaced the H-Pos and V-Pos pots, cleaned the edge connector and deconverted the board back to DKjr. This involved replacing 4 EPROMs and 2 Bipolar PROMs on the CPU board and 6 EPROMs and 1 Bipolar PROM on the video board. Tested. Board worked but would reset when bumped. Replaced the CPU socket and retested.
The 2650 CPU daughterboard from the kit had large square pins that damaged the CPU socket, requiring it to be replaced.
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Model: vs. Super Mario Bros.
Symptom: Dead
Cleaned legs on the program ROMs. Tested. Board would boot but had graphical corruption. Cleaned legs on the graphics ROMs and retested.
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Model: vs. Hogan's Alley
Symptom: Dead. Blue screen.
Replaced bad ROM 1B and tested. Screen had graphics corruption. Cleaned the Program ROM and Graphics ROM legs and retested.
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Model: Punch Out
Symptom: Dead. Comes up with either a blue screen or garbage.
Replaced a corroded power passthru connector on the CPU board and the matching plug on the power ribbon cable. The bad connection was preventing power from reaching the other boards.
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Model: Donkey Kong
Symptom: Dead. Scrolling garbage on screen. CPU board has had water damage.
Replaced the sockets at 5A, 5B, 5C, 5E, 7C, 7H, 3F, 3H, 2E, and 2F. Replaced corrosion damaged 2532 EPROMs at 5A and 5B, Z80A CPU at 7C, and 8035 CPU at 7H. Replaced the horizontal and vertical adjustment pots to fix the scrolling. The reset circuit was dead. Replaced C41, C40, C44, R60, and the 74LS123 at 1N to restore operation. Replaced physically damaged C164.
The game would not boot and the Fluke 9010a showed that Data Bus line 1 was being held low. Tested the 2114s at 3C, 3B, and 3A in a BK Precision 560A chip tester and replaced bad ones at 3C and 3B. The board would try to boot but was stuck on a flashing screen. RAM tests on the Fluke showed that the 2114 RAM IC at 4C was bad. Replaced the IC at 4C and played a few games.
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Model: Donkey Kong
Tip: CPU board RAM locations
The 2114 RAMs on the CPU board are laid out and addressed as follows:
$6000 - $63FF: 3C (low bits) / 4C (high bits)
$6400 - $67FF: 3B (low bits) / 4C (high bits)
$6800 - $6BFF: 3A (low bits) / 4A (high bits)
Sprite RAM at $6900 - $6A7F is on the video board
Video RAM at $7400 - $77FF is on the video board
RAM listed as "??" on the MAME .c file at $7000 - $73FF is on the video board
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Model: TMNT PC-10 Cartridge
Symptom: Locks up
Replaced bad Program ROM and tested. ROM had correct checksum but wouldn't run at speed.
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Model: Pro Wrestling PC-10 cartridge
Symptom: Dead
Patched gouged trace and tested
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Model: Golf PC-10 cartridge
Symptom: Dead
Replaced three corroded sockets and cleaned the ROM pins. Tested.
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Model: Tennis PC-10 cartridge
Symptom: Dead
Repaired a gouged trace and tested.
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Model: Playchoice 10 Dual Monitor PCB
Symptom: Crashes. Board has attempted repair damage.
Replaced several sockets and fixed a pulled trace on the CPU. The board would run but would start getting garbage on the screen after it had been on for about 5 minutes. Replaced a bad 2k x 8 .300" SRAM chip and retested.
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Model: Vs. boardset
Symptom: Broken sockets
Cleaned board. Replaced 2 broken 40 pin sockets and the other 2 40 pin sockets for good measure. Replaced 3 28 pin ROM sockets that had corroded contacts. Installed 6 EPROMs for Vs. Pinball, a CPU, and the matching PPU, and tested.
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Model: Donkey Kong
Symptom: Dead. Garbage on screen.
Reprogrammed the ROMs at 5A, 5B, 5C, and 5E. Tested and found many sounds missing. Cleaned the tarnished legs on the sound CPU, replaced the corroded EPROM and socket at 3H, and tested.
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Model: Playchoice 10
Symptom: Background graphic corruption.
Replaced a bad 74HC373 next to the PPU IC and tested.
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Model: Donkey Kong
Symptom: Dead
Checked EPROM checksums using an EPROM programmer and WinROMIdent. Connected the Fluke 9010A and found a bad 2114 RAM. Replaced the RAM and finished the RAM tests with the Fluke. Board now boots and plays but had graphic corruption. Cleaned tape residue off of the legs of an EPROM on the bottom board and tested.
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Model: Mario Bros
Symptom: Dead
Board had sound but no video. RAMs were not active on the bottom board and clocks were dead. Replaced shorted 74S74 at location 2T in the clock circuit and tested the game.
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Model: Donkey Kong (2 board set)
Symptom: Dead. Severe corrosion problems
Board had severe rodent damage.
Replaced CPU board with a stripped one from the parts pile. Moved over the 2 CPUs to the replacement board then installed 4 freshly programmed Program ROMs and 2 freshly programmed Sound ROMs. Tested board. Board worked, but sound did not and colors were off. Replaced 2 incorrect color PROMs (for a conversion game) with 2 new programmed 82S129 bipolar PROM and cleaned the 8035 CPU legs. Retested.
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Model: Popeye
Symptom: Missing parts
Board was partially parted out when I received it. It was missing the custom ALU, CPU, Sound IC, and all the EPROMs.
Replaced the CPU board with another parts board that had the custom ALU and sound IC installed. Replaced one broken ROM socket on the CPU board and one on the video board. Cleaned the edge connector. Installed a Z80A CPU and 4 freshly programmed 2764 EPROMs on the CPU board and 4 2764 along with 1 2732 on the video board. Cleaned the PROM and PLA legs then tested the board successfully.
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Model: Vs. Super Mario Bros.
Symptom: No green output
The board had no green output until it was on for a couple of minutes then the green output would suddenly work. Replaced bad 4066 quad switch and tested.
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Model: Donkey Kong
Symptom: Sounds are incorrect
Jump sound was bad. Replaced C24 and tested. Game played but played the incorrect digital sounds. Replaced bad 74LS367 at 4E and tested.
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Model: Donkey Kong
Symptom: Graphic corruption of sprites
Sprites were in the wrong location and were made up of incorrect graphic elements. Checked the RAMs with a Fluke 9010A and they all tested good. The 74283 and other chips in the positioning circuitry were good. The 82S09 RAM is one the Fluke cannot test and it had good inputs, but bad output signal on pin 25. Replaced the RAM and tested the game.
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Model: Donkey Kong
Symptom: Dead. Will not boot.
Reprogrammed the 4 corrupt Program ROMs and it would boot but would crash when trying to draw the screen. Replaced the 2 ribbon cable connectors on the CPU board as they had corroded pins and the 2 ribbon cables. Tested.
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Model: Donkey Kong
Symptom: Screen corruption
Game would try to play but could not draw the girders or other background elements properly. Sprites were OK.
Replaced 2 bad 2114 RAMs, which cleaned up some corruption, but not much. Replaced bad 74LS157 at location 3S to fix the issue and tested.
The chip was a Fujitsu and failed on pin 1. The chip is a 2-to-1 data selector but wasn't selecting the inputs as pin 1 toggled. It only bridged input 2 to the output.
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Model: Donkey Kong
Symptom: Garbage on screen
Replaced 74LS245 and LS273 on the video board to fix a stuck bit issue. Replaced one incorrect program ROM (bootleg game) with one programmed with Donkey Kong code. Tested. Game had no sound. Found the sound CPU was installed backwards. Removed and reinstalled the sound CPU correctly and tested the game successfully.
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Model: Donkey Kong Jr
Symptom: Graphic corruption and incorrect colors.
Cleaned the legs on the video output PROMs and replaced the PROM on the video board as it had a broken leg. Board booted but would randomly crash and had no sound. Tapping on the CPU would cause it to crash. Cleaned corroded CPU legs and tested. Replaced bad sound CPU to fix sound issue. Replaced bad ribbon cables to fix the graphics issues. Tested.
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Model: Donkey Kong Jr
Symptom: Dead. Flickering text on screen.
Replaced one bad 2114 RAM chip in text section to fix flickering text issue. CPU Bus is dead. Cleaned corroded pins on the Z80 CPU and the bus sprang to life, but sill crashed with 2 bits stuck low. Replaced bad 2114 RAM on the CPU board to fix the stuck bus, but game would crash because of corroded/damaged pins on the program ROMs. Replaced all 3 program ROMs and game would run and play, but with no music and no sprites.
Replaced corrupt sound program ROM and bad 8035 sound CPU to fix music issues. Replaced bad 8275 DMA Controller to fix the missing sprites issue. Burned in boardset and tested.
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Model: Dual Vs board.
Symptom: Won't boot Dr. Mario
Board arrived with the PPU for vs. RBI Baseball half ripped out of its socket. Carefully straightened the pins on the PPU and reinserted it. Tested the game and the Dr. Mario would not boot. Swap games around and the RBI Baseball would boot, but had horrid colors. The Dr. Mario booted and played fine on the other side. Replaced the PPU and CPU sockets on the left side, cleaned the edge connector, put the games back where they were initially and booted successfully. Played a few games to test.
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Model: Vs. Baseball
Symptom: Dead. Bad corrosion damage.
Removed the following corroded components, mostly from the right side of the board: 14 logic chips, 10 sockets, and 2 RAMs. Cleaned and inspected the board. Installed the following replacement chips and sockets: 2x LS32, 1x LS00, LS74, LS04, F04, 2x LS138, LS245, LS373, 2x LS157, 6116 SRAM, and 6264 SRAM. Installed sockets for the 4 Program ROMs, 2 Graphic ROMs, CPU, and PPU. Patched 1 open trace and installed a missing transistor in the Green color output for the right side.
Vs. Baseball requires both sides of the board and the PPU for the right side was trashed by corrosion. Programmed replacement ROMs for Vs. Pinball and installed that on the right side. Moved the CPU and PPU for Vs. Baseball to the right side. Installed a PPU and CPU on the left side and programmed replacement ROMs for Score and Match Golf which matched the PPU revision. Tested board.
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Model: Donkey Kong 3
Symptom: Dead. Garbage on the screen.
Program ROM 7B and 7C were corrupt. Program ROM 7C was rewritten while program ROM 7B failed and was replaced. Both sound ROMs were corrupt and unable to be reprogrammed so they were replaced.
The board would boot and play but had vertical strips of missing moving characters. The blank spaces had some flashing to them which pointed to an open trace on the board. Found an open input on the 74LS00 at 4K, pin 2. That was connected to the 82S09 RAM and through a broken trace to an LS30 at 5P. Fixed the trace to finish the repair.
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Model: Donkey Kong
Symptom: Dead
Board was badly sun bleached.
Every EPROM on the CPU board was blank and had to be reprogrammed. The board was still dead and missing the CPU clock. Replaced a corroded P2 connector on the CPU board and the ribbon cable connected to it. Replaced a 74LS367 on the video board with a stuck output restoring the CPU clock. The CPU was still dead. Patched a dead trace on a data line between two of the 2114 RAMs to fix the CPU issue. The board booted up, but with bad colors.
Removed and socketed a 74LS174 in the video output circuitry and patched multiple dead traces on it to fix the color output then tested.
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Model: Playchoice 10
Symptom: Will not play carts
Unit had a bad PPU, but the owner said they had a spare so popped the shop PPU in and started the repair.
Patched a dead trace on the 74LS245 next to the CPU. Pin 18 of the LS245 had no signal on it. Found an open trace between slot 1 and slot 2 (cart was in slot 2) and patched it. Tested and patched multiple traces on the slots then tested a cart in each slot. Every slot worked, except for slot 5. Patched a trace between pin A29 and the 74LS42 decoder chip responsible for slot selection. Tested
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Model: Donkey Kong / Special Forces
Symptom: Dead. Physical damage. Deconvert.
Board was converted to Special Forces by Magic / Senko
Replaced bad ribbon cable next to CPU sockets, resoldered broken cap in the reset circuit, repaired broken wire on graphics ROMs, and replaced broken Vertical pot. Tested successfully. Removed CPU add-on board, ROMs, and bipolar PROMs from the PCB. Installed new Z80 and 8035 CPUs and sockets. Programmed and installed a whole ROM set and 3 replacement Bipolar PROM chips. Tested Donkey Kong and found the jump sound was incorrect. Replaced bad capacitor at C24 and retested successfully.
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Model: Donkey Kong
Symptom: No text or ladders
Replaced bad bipolar PROM on the video board. Tested.
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Model: Donkey Kong
Info: ROM Locations
For those repairing 2-board Donkey Kong games and using MAME ROM dumps to do it... the chips are out of order from what you find in dkong.zip
CPU Board:
CPU Program ROMs are OK...
5A = c_5at_g.bin = 2532 EPROM
5B = c_5bt_g.bin = 2532 EPROM
5C = c_5ct_g.bin = 2532 EPROM
5E = c_5et_g.bin = 2532 EPROM
Sound Program ROMs are different...
3F = s_3j_b.bin = 2716 EPROM
3H = s_3i_b.bin = 2716 EPROM
Bipolar PROMs are different:
2E = c-2k.bpr = 82S129
2F = c-2j.bpr = 82S129
Video Board:
Video ROMs are different...
7C = l_4m_b.bin = 2716 EPROM
7D = l_4n_b.bin = 2716 EPROM
7E = l_4r_b.bin = 2716 EPROM
7F = l_4s_b.bin = 2716 EPROM
3P = v_3pt.bin = 2716 EPROM
3N = v_5h_b.bin = 2716 EPROM
Bipolar PROM:
2N = v-5e.bpr = 82S129
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Model: Vs. Excitebike
Symtpom: B button not working
Found a cut trace under where a capacitor was previously removed from the board. Patched trace and tested.
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Model: Donkey Kong
Symptom: No vertical sync
Traced back through the vertical sync circuit to a dead pin 12 on the 74LS10 at 7A. Replaced the LS10 and tested.
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Model: Donkey Kong
Symptom: Dead, garbage on screen, and no vertical sync.
Board had attempted repairs done to it.
Found a .0022uf capacitor cobbed to cut legs of a cap in the vertical sync generator circuit. Repaired that. Inspected the CPU board andremoved the ROM at 5E to find a leg broken and the rest of the legs corroded. Removed the previously replaced socket and found preexisting damage - 2 cut and 1 partially cut traces. Patched the damaged traces, installed a new socket, and programmed / installed a replacement EPROM. Tested.
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Model: Donkey Kong
Symptom: Garbage on screen. Missing ROMs
Owner pulled ROMs and asked that a new set be installed.
Installed missing ROMs. Board had text/girder issues. Replaced a bad 74LS174 at 2M on the video board and tested. Problem was better, but still bad, the main CPU was crashing, and the sound CPU was not working. Checked the whole circuit and the circuits on the top board that send/receive data from the video board. Nothing wrong. Cleaned the sound CPU legs to fix that issue then cleaned the main CPU legs to fix the graphic corruption and crashing. Tested.
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Model: Donkey Kong Jr
Symptom: Dead
Cleaned multiple corroded legs on the overlay ROMs, program ROM, CPU, and DMA chip. Cleaned the ribbon cable connectors and replaced one bad ribbon cable. Tested.
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Model: Donkey Kong Jr
Symptom: Bad and missing sounds
Replaced missing C22, broken Q3, and broken C24 to fix jump sounds. Replaced C31 on the DAC. Replaced broken C27. Tested.
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Model: Donkey Kong
Symptom: Text overlay issue
Replaced 2x 2114 RAMs to fix the video issue and tested. Board was missing digital sounds. Turned VR2 all the way up and was barely able to hear the sounds. Replaced bad LM324 op-amp and tested.
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Model: Donkey Kong
Symtpom: Dead. Garbage on screen.
Cleaned the edge connector. Replaced 1 2114 RAM (Work RAM) and tested.
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Model: Donkey Kong
Symptom: Dead.
Cleaned edge connector. Cleaned the pins on the rainbow cable connection on the video board. Board displayed garbage on screen. Replaced dead 8257 DMA Controller. It was holding /BUSRQ low, causing the CPU to never start. Tested. Garbage text and corrupt graphics. Replaced a 2114 RAM on the video board. Tested.
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Model: Donkey Kong Jr
Symptom: Dead. Garbage on screen
Board had a High Score Save module installed. Removed module, repopulated the ROMs and CPU on the board and it booted. Obtained the code and programmed a replacement 27256 EPROM for the HS Save module. Test routine reported DMA Failure. Downward pressure on the module would cause that error to come and go. Removed CPU socket to discover a lifted pad and trace damage on pin 36 of the CPU. Replaced the socket and patched the traces with Kynar. Reinstalled the module and tested.
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Model: Donkey Kong
Symptom: No audio
Cleaned corroded pins on the audio CPU. Tested. The board ran, but had vertical streaking in all sprites. Tracked it backwards from the ECL RAM to the 10125 ECL clock buffer IC. Replaced it and tested.
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Model: Donkey Kong
Symptom: Sprites disappear on different sections of the screen.
On power up and after heat soak all that was apparent was a slight glitch in barrel graphics. Turned down the +5 until it was 4.6v on the video PCB and the problem showed. Replaced bad 74LS157 at 8S and tested.
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Model: Donkey Kong Jr
Symptom: Garbage on screen
Replaced bad 74LS245 at 6A on the CPU board. This chip latched data to/from the CPU board to the Video board.
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Model: Donkey Kong Jr
Symptom: Sometimes will not boot
Board had wrong IC installed in the sound CPU socket.
Replaced incorrect sound CPU and bad socket with a proper 8035 CPU chip and new socket. Tested. Falling sound was distorted. Replaced bad cap at C26 and tested. Tapped PCB and could make it crash. Cleaned dirty legs on the ROMs at 5B and 5C. Tested by banging the board harshly on the bench and seeing no reboots.
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Model: Double Donkey Kong
Symptom: No sync
Replaced the Horizontal and Vertical position pots. Tested. Video had horizontal stripes of color on the screen. Resoldered the bodge wire on Pin 27 on the ROM at 3N on the video PCB. Tested.
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Model: Donkey Kong (Cocktail 4-board)
Symptom: Sprite tearing and motion issues
Sprites were tearing vertically until the PCB warmed up then some sprites were missing sections. Mario would walk up the center of the ramps and not on the surface. When jumping, the motion was very jerky.
Replaced bad 74LS283 at location 3E on the Clock PCB and tested. No sound. Cleaned the pins on the sound CPU and the 2 sound ROMs. Tested.
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Model: Vs. Super Mario Bros
Symptom: Dead. No sync.
Cleaned edge connectors. Board booted to garbage. Replaced both CPU sockets, both PPU sockets, and cleaned the CPU legs. Installed missing jumper on the 2nd CPU socket required for SMB to run. Game booted but would immediately crash. Replaced 4 corroded ROM sockets and 4 corroded Program ROMs. Board died. Replaced bad 74LS04 on the /RESET line. Tested. Replaced 2 corroded Graphics ROMs. Tested.
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Model: Donkey Kong Jr
Symptom: Dead. Graphics corruption.
Replaced bad Z80 CPU and bad color ROM at 3P. Cleaned the Graphics ROM legs and tested.
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Model: Donkey Kong
Symptom: Deconvert Special Forces back to DK. Screen rolls.
Replaced bad pots to fix screen rolling issue. Removed daughter board, graphics ROMs, color ROMs, 3 Bipolar PROMs, and removed 2 soldered jumpers. Installed new Z80 and Sound CPU sockets as the square pins on the daughterboard damaged them. Installed 4 newly programmed Program ROMs, 2 Sound ROMs, 2 Color ROMs, 4 Graphics ROMs, and 3 Bipolar PROMs. Tested. Board had bad jump sounds. Patched 2 cut traces on the 4049 IC in the jump sound section and tested.
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Model: Punch Out
Symptom: Dead
Replaced missing 74LS14 on the CPU board /RESET line. Replaced bad CPU. Board powered up but was missing colors. Replaced a broken PROM socket at 8F and a bad PROM at 8E on the BAK PCB. Replaced broken transistor on the counter output circuit. Tested.
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Model: Donkey Kong 3
Symptom: No blue on display
Replaced bad 82S129 PROM at 1C on the CPU board. Tested.
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Model: Vs. Super Mario Bros
Symptom: Red screen, graphic corruption, reboots.
Replaced all 12 28-pin and all 4 40-pin sockets as they were corroded. Patched a gouged trace on the bottom of the PCB going to ROM 8B's control line. Reprogrammed the ROMs as they had been partially erased by exposure. Replaced the ROM at 6C as it failed to reprogram. Installed 2 missing transistors to restore the Green and Blue color outputs. Tested.
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Model: Vs. Super Mario Bros
Symptom: No sync, reboots
Replaced all 12 28-pin and all 4 40-pin sockets as they were corroded. Patched 6 battery damaged traces between the ROMs at 1A and 1B and 1 damaged trace between the ROMs at 2A and 2B. Reprogrammed the ROMs as they had been fully erased by exposure. Replaced a missing capacitor in the SYNC output circuit to restore video sync. Tested.
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Model: Vs. Castlevania module
Symptom: ROM Error on boot.
Reprogrammed the EPROM as it had been partially erased by exposure. Straightened a bent pin and tested.
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Model: Playchoice 10
Symptom: Garbage on screen
NES subsection was fine. The Z80 subsection had garbled junk on screen.
Replaced 74LS42 cartridge selector IC and patched one damaged trace. Tested.
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Model: Donkey Kong
Symptom: Dead. Garbage on screen.
Cleaned edge connector with a fiberglass pencil. Replaced bad Z80 and the corroded CPU socket. Reprogrammed the corrupted ROM at 5E. Tested. Board would attempt to play but had text garbage on screen and the girders were corrupt. Replaced 2x 2114 RAM chips and tested - no sound. Replaced corroded sound CPU socket and reprogrammed the Sound Program and Sound Sample ROMs as they were blank. Tested.
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Model: Punch Out
Symptom: Missing computer character
Replaced corroded power and video connectors on CPU board and the power and video cables. Symptom would come and go if board was flexed. Found 2 bodge capacitors next to C62 that were touching. Moved capacitors apart and tested.
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Model: Super Punch-Out
Symptom: Missing player character
Character ROMs had no output. Pin 22 was stuck high on each. The 74 LS139 at 6J was missing the G (Control) input on pin 15. Replaced 74LS04 at 6E and tested.