New Life Games LLC

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, 07:05:15 PM

Title: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:05:15 PM
Model: Turbo Out Run
Symptom: Dead

Lights were on for the video board but not for the CPU board. Replaced burned power connector and adjusted power supply voltage to 5.05v.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:05:30 PM
Model: Turbo Out Run
Symptom: Missing obstacles and background objects

This was a strange one. The sky and road obstacles were missing. The buildings were there but the road and the car never moved left or right. This was a problem with the subprocessor. Built-in tests showed one of the ROMs bad. ROM read good in an EPROM programmer and a replacement ROM gave the same symptoms. Checked all the pins on the socket for continuity. The ROM pairs (High & Low) had a common CE line. This was driven by a 74LS138. The chip had badly rusted legs. Replaced the chip and the game worked normally. The rust had travelled up the body of the chip.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:05:43 PM
Model: Turbo Out Run
Symptom: No audio

Resoldered the interconnects and the audio output IC on the amplifier board.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:05:58 PM
Model: Sega NAOMI
Symptom: Fails self test

Self test showed IC29 as bad. Replaced IC29 and re-ran the test.

IC29 was a standard 62256 surface mount type SRAM IC.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:06:10 PM
Model: Sega NAOMI
Symptom: Dead

System gave raster but no picture. Inspection of the board turned up a leaking .1f 5.5v memory capacitor. The electrolyte spread on the board and started corroding things.

Desoldered the BIOS ROM and the serial EEPROM holding the code for the Altera FPGA chip. Cleaned the electrolyte from the board and inspected the board for damage. The corrosion damaged a plate thru under the serial EEPROM socket, causing the FPGA chip to not load its code from the EEPROM upon boot. Repaired the trace, replaced the bad memory cap, and tested the board.

The EEPROM chip connects to the Altera chip as follows:

Pin 1 - Pin 12
Pin 2 - Pin 1
Pin 3 - Pin 37
Pin 4 - Pin 4
Pin 5 - Ground
Pin 6 - No Connection
Pin 7 - +5v
Pin 8 - +5v
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:06:31 PM
Model: NAOMI
Symptom: Broken USB jack and noisy fan

Replaced the noisy fan and USB jack.

USB jack was tough to find. Desoldered the jack and took it to an area "computer junk store." Found a Pentium II board in their scrap bin that had the same jack. Desoldered and installed it on the NAOMI system. Played a game of Marvel vs. Capcom 2 to test the system.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:06:47 PM
Model: Spiderman (System 32)
Symptom: Missing graphics

Repaired a gouged trace between IC44 through 47 (Dual Port Video RAM) and IC67, a custom Sega IC.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:07:02 PM
Model: NAOMI 1
Symptom: Has audio but no video.

Traced the video output back to the RAMDAC chip. The RAMDAC was finger blistering hot. Replaced the RAMDAC (Sega # 315-6145) with one pulled from a parts NAOMI board.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:07:15 PM
Model: NAOMI 1
Symptom: Intermittent controls

Replaced a broken USB jack on the I/O board. Checked and replaced a leaking memory backup capacitor.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:07:27 PM
Model: NAOMI Capcom I/O
Symptom: Audio cuts in & out

Recapped the audio section and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:07:41 PM
Model: ST-V w/Shienryu cart
Symptom: RAM failure

Could not duplicate RAM failure message. Game would not boot but system would pass all user tests. Reset NVRAM and system would then recognize cartridge. Set the game cabinet for 2 player mode and took it out of multi mode. System would now see and test cartridge but still fail to play it.

Booted the game into factory diagnostics and ran the factory set of diagnostics on the game board. The board would "pass" the slave CPU but would lock up as that test finished. Pushed down on the slave CPU (Hitachi SH-2 with LOTS of small pins) while booting the board and it immediately fired up the game cart properly. Resoldered the slave CPU and played a couple of games to test the system.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:07:57 PM
Model: Columns
Symptom: Game would lock up. Colors were flashing incorrect on the screen and inputs would not work.

Replaced a bad 315-5296 custom IC to fix the inputs. Resoldered pin 30 on hybrid IC 315-5242 to fix the color issue. Resoldered custom IC 315-5313 to fix the lockups.

Reset the DIP switches and tested the game.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:08:09 PM
Model: Naomi 1 cart: Marvel vs. Capcom 2
Symptom: Locks up, random errors on ROM tests

Replaced 6 surface mount 74LCX16245 16bit buffer ICs and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:08:25 PM
Model: ST-V
Symptom: Cartridge error

Resoldered the two surface mount SH-2 CPUs, cleaned the slot, and ran the board through diagnostics.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:08:36 PM
Model: ST-V
Symptom: Random failures - lockups, cart errors, etc.

Resoldered the two surface mount SH-2 CPUs, cleaned the slot, and ran the board through diagnostics.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:08:49 PM
Model: NAOMI Capcom I/O
Symptom: Dead, no power

Metal case was bent and touching the bottom of the board, shorting it out. Replaced one broken ferrite filter and straightened the metal case. Reassembled and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:09:16 PM
Model: NAOMI
Tip: Error Messages

Error 01: This game is not acceptable by main board.
[CAUSE] MEDIA BOARD is not inserted (completely) into the MAIN BOARD.
[COUNTERMEASURES] Power off the unit, then reinsert the MEDIA BOARD.
Should the problem persist, the BOARD may be damaged.

Error 02: Main board malfunctioning.
[CAUSE] MAIN BOARD is inoperative.
[COUNTERMEASURES] Verify that the MAIN BOARD is connected properly.

Error 03: Bad serial number on main board.
[CAUSE] Unable to read MAIN BOARD serial ID.
[COUNTERMEASURES] Disconnect the MEDIA BOARD from the MAIN BOARD and send the MAIN BOARD for repair.

Error 04: Bad serial number on media board.
[CAUSE] Unable to read MEDIA BOARD serial ID.
[COUNTERMEASURES] With the MEDIA BOARD still attached to the MAIN BOARD, send the unit in for repair.

Error 05: This game is not acceptable by main board.
[CAUSE] The game is a foreign edition.
[COUNTERMEASURES] Use the domestic version of the game.

Error 11: JVS I/O board is not connected to main board.
[CAUSE] (1) I/O BOARD is not connected. (2) Unreliable connection between MAIN BOARD and I/O BOARD.
[COUNTERMEASURES] (1) Connect the I/O BOARD to the MAIN BOARD. Verify that the power cable is connected to I/O BOARD. (2) Reconnect or replace the USB CABLE that connects the I/O BOARD to the MAIN BOARD.

Error 12: JVS I/O board does not fulfill the game spec.
[CAUSE] Correct I/O BOARD is not connected.
[COUNTERMEASURES] Use an I/O BOARD that provides the proper input/output for the game.

Error 21: This game is not acceptable by main board.
[CAUSE] Game data loaded from the GD-ROM to the DIMM BOARD is corrupted.
[COUNTERMEASURES] Verify the GD-ROM DRIVE and interface connection. Check the GD-ROM disc for scratches, dust or dirt.

Error 22: Communication error occurred between main board and media board.
[CAUSE] No response from DIMM BOARD to MAIN BOARD.
[COUNTERMEASURES] Ensure that the DIMM BOARD and the GD INTERFACE BOARD are properly connected. Should the problem persist, the DIMM BOARD or GD INTERFACE BOARD may be damaged.

Error 23: GD-ROM drive cover is open.
[CAUSE] The GD-ROM DRIVE cover is open.
[COUNTERMEASURES] Ensure the GD-ROM DRIVE cover is firmly closed.

Error 24: GD-ROM is not found.
[CAUSE] GD-ROM disc is not found.
[COUNTERMEASURES] Insert the GD-ROM disc correctly. Check the GD-ROM disc for scratches, dust or dirt.

Error 25: Cannot access GD-ROM drive.
[CAUSE] (1) Unable to access GD-ROM DRIVE. (2) The GD-ROM DRIVE cover is open.
[COUNTERMEASURES] (1) Verify that the GD CABLE and the power cable are properly connected to the GD-ROM DRIVE. (2) Close the GD-ROM cover securely. Should the problem persist, the GD-ROM DRIVE may be damaged.

Error 26: Media board malfunctioning.
[CAUSE] KEY CHIP is not found.
[COUNTERMEASURES] Attach the proper KEY CHIP for the game. Insert the KEY CHIP securely.

Error 27: DIMM memory is not enough.
[CAUSE] (1) Insufficient DIMM MEMORY on DIMM BOARD. (2) DIMM MEMORY is not connected securely.
[COUNTERMEASURES] (1) Provide a suitable amount of DIMM MEMORY for the software. (2) Verify that the DIMM MEMORY is connected securely to the DIMM BOARD.

Error 31: This game is not acceptable by main board.
[CAUSE] The game has not been downloaded into the DIMM BOARD from the HOST MACHINE.
[COUNTERMEASURES] Check network connections. Verify that the PC is connected to the network. Reset the main power. Wait until the game is displayed on the main screen, then turn the satellite power on and reboot. In Test Mode, select NETWORK SETTING from the SYSTEM MENU and check that the NETWORK TYPE is set to ETHER. In Test Mode, select NETWORK SETTING from the SYSTEM MENU, go to SET IP ADDRESS and verify that the REMOTE
setting is appropriate for the game in use. Check the internal DIMM BOARD battery is functioning

Error 32: DIMM memory is not enough.
[CAUSE] (1) Insufficient DIMM MEMORY on DIMM BOARD. (2) DIMM MEMORY is not connected securely.
[COUNTERMEASURES] (1) Ensure there is sufficient DIMM MEMORY for the software. (2) Verify that the DIMM MEMORY is connected securely to the DIMM BOARD.

Error 33: Gateway is not found.
[CAUSE] HOST MACHINE is not found.
[COUNTERMEASURES] Attach the KEY CHIP designed to support the game. Make certain that the KEY CHIP is inserted completely.

Error 51: Wrong video output setting of horizontal scanning frequency.
[CAUSE] The game does not support horizontal sync frequency setting.
[COUNTERMEASURES] Change the No. 6 DIPSW on the CONNECTOR BOARD. ON is 31 kHz, OFF is 15 kHz. The monitor must support these frequencies.

Error 52: Wrong video output setting of horizontal/vertical screen.
[CAUSE] The game does not support the vertical/horizontal screen settings.
[COUNTERMEASURES] Change the No. 4 DIPSW on the CONNECTOR BOARD. ON is for vertically placed monitor screens, OFF is for horizontally placed monitor screens. Change the monitor placement from vertical to horizontal or vice versa if necessary.

CAUTION 54: GAME ASSIGNMENTS ARE INCORRECT. SET CORRECTLY IN SYSTEM ASSIGNMENTS OF TEST MODE.
[CAUSE] The setting of MONITOR TYPE differs from the correct setting of the game.
[COUNTERMEASURES] Enter the TEST mode, and change the MONITOR TYPE setting of MONITOR TYPE in SYSTEM ASSIGNMENTS to the correct setting
suitable for the game. For the correct setting, refer to the Instruction Manual attached to the game. If necessary, perform Horizontal/Vertical transposition of the monitor, as applicable.
(In other words, set it to the appropriate monitor type (vertical/horizontal play) and rotate the monitor as necessary.)
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:09:34 PM
Model: NAOMI
Symptom: Error 01: This game is not acceptable by main board.

Connector CN1 had 4 bent pins. Replaced bad connector with one from a parts board and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:09:46 PM
Model: ST-V
Symptom: Won't play carts

Ran system through self tests. System locked up doing the cart test. Ran factory tests and board passed all except would lock up on testing the slave CPU. Resoldered both SH-2 CPUs and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:10:00 PM
Model: Naomi JVS JAMMA adapter
Symptom: No sync to monitor

I/O board would not output sync to monitor. Replaced bad surface mount 74ACT86 and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:10:12 PM
Model: Naomi
Symptom: Will not communicate with JAMMA adapter

Replaced broken USB port on the Naomi's I/O board. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:10:25 PM
Model: Naomi
Symptom: RAM Error. Will not boot cartridges

Self test showed error on IC29, the 62256 SRAM used for backup. Pin 20 on the RAM was stuck high. Removed leaking backup memory capacitor and the 8 pin EEPROM next to it. Cleaned up the leakage, resoldered 3 pins on the surface mount 74157, installed a new .1F supercap, new 8 pin socket, reinstalled the EEPROM, and patched a damage trace on the EEPROM. Tested.

This EEPROM is used to load configuration data into the Altera FPGA chip. Without it working correctly the board will not operate properly.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:10:45 PM
Model: Naomi
Symptom: RAM Error. Will not boot cartridges

Self test showed error on IC29, the 62256 SRAM used for backup. Pin 21 on the RAM was missing its signals. Removed leaking backup memory capacitor and the 8 pin EEPROM next to it. Cleaned up the leakage, installed a new .1F supercap, new 8 pin socket, reinstalled the EEPROM, and patched a damage trace between the BIOS ROM and IC29. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:11:01 PM
Model: Naomi
Symptom: Dead

CPU fan was frozen. Replaced CPU fan and bad case fan. Replaced leaking supercap and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:11:14 PM
Model: Naomi GD-ROM, 610-0617
Symptom: Dead

JAMMA I/O power cable and GD-ROM power cable were mixed up and the GD-ROM was killed with +12v on the 5v line.

Replaced the control board with the control board from a Sega Dreamcast and tested.

This model of GD-ROM uses the same board and laser assembly as the Sega Dreamcast.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:11:30 PM
Model: Naomi
Symptom: Missing audio on right channel

Replaced burnt 510 ohm surface mount resistor at R333S and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:11:54 PM
Model: Pengo
Symptom: Dead

Board was in a bulk buy and had been scavenged for parts.

Replaced missing 74LS04 and 74LS138 ICs. Board had no clock. Replaced 74LS368 at IC6. No change. Examined clock circuitry closely and saw a hairline crack in R17. Replaced R17 and board tried to boot. Cleaned EPROM legs and board booted, but had graphics problems.

Moving graphics were jerky in nature and backgrounds and text were flipped from the direction the player sprites were playing, similar to a flipped screen in cocktail mode, until after the first round of attract mode finished then were correctly oriented. Repaired 2 gouged traces, one going to an input to a 7489 Bipolar RAM, to fix the jerking graphics. The FLIP signal coming from the 74LS259 at IC 27 was improper on power up and corrected after the first round of attract mode. Replaced the IC and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:12:07 PM
Model: Chihiro (House of the Dead III)
Symptom: Error 2: Mainboard Error

This system is a Microsoft XBox system with a Sega adapter board attached and a standard Naomi Network DIMM board and GD-ROM plugged in. The Sega adapter board had the same type of leaking .1F supercap that the Naomi 1 systems have. (Unsure on Naomi 2 as I haven't had one on the bench yet.)

Also, the Xbox system it's based off of has a 2.5v 1F supercap over on the front edge of the board. It leaks too and will corrode traces.

You MUST remove the caps, clean up the electrolyte leakage, and replace the caps. Check ANY and ALL traces around the .1F cap on the Naomi adapter board. Patch any damaged traces. Be careful as there is one trace that goes under a tiny 8 pin chip to a pin on the opposite corner and not straight up the side of that chip like it looks.

Patched 1 trace, replaced the supercaps, and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:12:24 PM
Model: Naomi GD-ROM
Symptom: Will not read discs

Controller board had a smoked IC chip. Replaced the Toshiba TC9450AF IC with one from a donor board. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:12:44 PM
Model: Naomi GD-ROM
Symptom: Very noisy when seeking

Replaced laser head motor/gear and tested. Gear had cracked and spread far enough apart that it was causing the gears to click.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:13:00 PM
Model: Naomi GD-ROM
Symptom: Will not read discs

Replaced laser assembly with one from a physically damaged donor drive. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:13:14 PM
Model: Sega Naomi
Symptom: RAM Error

RAM Error: U29 bad

Removed leaking supercap, the 8 pin EEPROM, and the 42 pin BIOS and socket. Cleaned electrolyte from the board and jumpered 2 traces damaged by the leaking supercap. Replaced the 8 pin socket for the EEPROM and reinstalled the IC. Reinstalled the 42 pin socket and the BIOS chip. Reset the Backup RAM and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:13:26 PM
Model: NAOMI
Symptom: Dead

Both the GPU and case fan were seized. Replaced both fans and tested. Replaced leaking memory supercap and re-tested.

NOTE: The NAOMI will NOT boot if the GPU fan is turning slow or not at all.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:13:40 PM
Model: Laser Ghost (System 18)
Symptom: No sync, Crackled sound

Cleaned board, cleaned edge connector with a fiberglass pencil, and replaced 2 physically damaged caps. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:13:54 PM
Model: ST-V
Symptom: Dead

Built a replacement shorting plug to go into connector CN5. Game then booted with a cartridge error. Ran Factory Tests on Slave CPU and it passed. Disassembled the Die Hard cartridge, cleaned the edge connector, reassembled, and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:14:10 PM
Model: ST-V
Symptom: Dead

Resoldered the 2 SH-2 CPUs. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 07, 2014, 07:14:38 PM
Model: ST-V
Tip: Building a shorting connector for CN5

The board will not boot without this shorting connector or a daughterboard plugged into CN5. Take a female jack that fits the connector (Same kind as on a Playchoice-10 motherboard) and built is as follows:

Cut and remove all soldertail pins from row C
Cut and remove pins A1 through A5
Cut and remove pins B1 through B5
Cut and remove pins A27 and B27
Bend pin A6 to touch B6, A7 to touch B7, A8 to touch A8, and so on for all the remaining pins on rows A and B.
Solder pin A6 to B6, A7 to B7, A8 to B8, and so on for all the remaining pins on rows A and B.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on July 27, 2014, 09:42:13 PM
Model: NAOMI 2
Symptom: Leaking supercap

Cleaned up leakage from the supercap and patched two damaged traces.

Note: Most of the large group of traces near the supercap go to a pair of SOIC chips, but the 5th one in the group goes under them and down to the right most of the set of 4 thru-holes on the far side of the coin cell battery holder. If the traces have dark spots on them the electrolyte from the supercap has damaged the traces. Check continuity on them and patch as needed with 30ga Kynar wire.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on November 25, 2014, 07:10:40 PM
Model: Bloxeed
Symptom: No sound

Replaced blown audio amp chip and one capacitor in the sound section. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on November 27, 2014, 12:31:20 AM
Model: Pengo
Symptom: Crash/reboot. Character placements on screen are wrong

Pin 40 on the custom CPU was broken at the ceramic body of the IC and causing the crashing/rebooting. Replaced the custom CPU with a standard Z80A and erased/reprogrammed the 8 program EPROMs with unencrypted ROM code from the pengo3u ROM set. Replaced 74LS161 at IC90 to fix the character placement issue. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on December 30, 2014, 04:30:37 PM
Model: Clutch Hitter (System 18)
Symptom: Will not play.

Replaced missing PAL and tested.

Converted game to Hammer Away. :)
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on January 11, 2015, 10:19:41 PM
Model: My Hero
Symptom: Lines on screen when cold

The top of the screen and a few other graphic elements had lines through them for the first couple of minutes of game play until the board warmed up. Replaced a bad 315-5025 18-pin custom IC at IC46 and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on January 28, 2015, 07:32:37 PM
Model: Wonderboy
Symptom: Dead. Nothing on screen.

Replaced bad program ROM at IC132 and bad sprite ROM at IC 2 on the small daughterboard. Board would now play blind. Cleaned board, replaced bad 74S175 at IC153 and IC152 to restore video output. Graphics were corrupt and sprites were missing. Cleaned ROM legs on IC80, 81, 82, and IC63, 64, and 65 to fix graphics issue. Replaced bad 74S175 at IC67 to restore sprites. Replaced broken red LED and tested game.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on September 27, 2015, 12:31:07 PM
Model: Clutch Hitter
Symptom: Dead. Sync is improper causing monitor to go crazy.

Removed suicide CPU replaced it with a standard 68000 CPU. Converted game to Hammer Away ROMs and set the jumpers on the daughterboard. Reflowed several sides of surface mount chips that were barely soldered at the factory and noticed that the main CPU clock was missing. The three oscillators were dead and would jump to life when the power pins were touched with the logic probe. Replaced OSC1, OSC2, and OSC3 and tested.

Reset Backup RAM to fix the garbled high score table and retested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on March 10, 2016, 10:22:39 PM
Model: Regulus
Symptom: Dead

Cleaned corroded pins on all socketed chips. Board would boot but had no sync and no blue. Cleaned edge connector and retested. Board would boot and play but had corrupt background graphics. Self test showed ROM 133 was bad. Checked the socket and found pin 11 (Data 0) was not making contact with the IC. Replaced the bad socket and tested the board successfully.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on August 21, 2016, 05:28:36 PM
Model: ST-V
Symptom: Dead

Reflowed the 2 SH-2 CPUs then replaced 3 burned 75 ohm resistors and 3 blown transistors in the video output section. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on December 18, 2016, 07:00:26 PM
Model: Bloxeed
Symtpom: Missing graphics elements. Garbage on screen.

Reflowed a surface mount video controller IC that had cracked solder joints and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on December 18, 2016, 07:03:58 PM
Model: Columns
Symptom: Dead

Replaced 2 bad 64K SRAM ICs and a damaged ROM socket then straightened a bent pin on one of the program ROMs. Board would then run through attract mode but had missing graphics. Replaced the 27C010 EPROMs (JEDEC pinout) with the correct 27C100 (non-JEDEC pinout) EPROMs and tested. Board would lock up when starting game. Replaced incorrect security IC and retested successfully.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on December 21, 2016, 10:03:10 PM
Model: Naomi
Symptom: Leaking supercap. Will not read switches.

Removed IC31, its socket, and the leaking supercap. Cleaned under and around the cap and where IC31 was. Patched a damaged trace to IC29. Installed a new 8 pin socket for IC31 and patched a damaged trace to pin 4 of it. Game would boot but not read any switch. Replaced 2 bad pushbutton switches and 1 set of 4 DIP switches with new ones and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on December 24, 2016, 12:39:00 AM
Model: Naomi
Symptom: Noisy. Replace supercap

Replaced case fan and leaking supercap. Tested. Failed RAM tests for IC29. Jumpered 2 dead traces and replaced the 8 pin EEPROM socket. Tested successfully.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on December 24, 2016, 12:40:08 AM
Model: Naomi
Symptom: Dead

Board actually played blind. Replaced 3 bad 470uf caps in the video circuit and a dead 315-6145 DAC IC to restore video. Replaced the 8 pin EEPROM socket and the leaking supercap. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on December 27, 2016, 12:07:03 PM
Model: Naomi GD-ROM
Symptom: GD-ROM not found. Noisy.

Replaced optical mechanism and tested. Replaced bad fan and tested again.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on January 30, 2017, 08:59:39 PM
Model: Moonwalker
Symptom: Dead

Board had a Sega Resurrection kit installed but was not brought back to life.

Checked the data bus pins on the program ROMs from Sega Resurrection and found that the chip in A7 had garbled data lines, but the EPROM checked good in a programmer. Back tracked the circuit and found the Work RAM on the same bus and replaced it. Tested the game successfully.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on February 19, 2017, 07:24:41 PM
Model: Thunder Blade
Symptom: Dead

Replaced the suicide CPU with a proper 68000 CPU and erased/reprogrammed 2 EPROMs with suicide free code. Tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on May 22, 2017, 10:15:30 PM
Model: Moonwalker
Symptom: Dead

Board was missing 1 program ROM, 3 SCR ROMs, 2 Sound ROMs, and 4 OBJ ROMs.

Replaced dead CPU with a 68000 CPU, replaced the program ROM and the missing program ROM with ones programmed with suicide free code. Replaced remaining missing ROMs and tested. Board worked but had graphic corruption with some elements and colors missing. Patched a gouged trace going to pin 8 (Address line A0) of the 2 Color RAMs and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on October 11, 2017, 09:42:41 PM
Model ST-V
Symptom: Locks up while playing

Reflowed the 2 SH-2 CPUs and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on October 11, 2017, 09:43:20 PM
Model: ST-V
Symptom: Cart Error

Put board in factory test mode and it failed the Slave CPU test. Reflowed both SH-2 CPUs to fix the error and tested.
Title: Re: Sega Games (Other Arcade)
Post by: channelmaniac on October 11, 2017, 09:44:44 PM
Model: ST-V
Symptom: Dead. Missing plug-in power coupling module.

Fabricated a replacement module and installed it. Board was still dead. Tested the GAL chip next to the 68K CPU and the BIOS chip by substitution from a working board. Still dead. Reflowed both SH-2 CPUs to revive the board and tested.