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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, 06:35:07 PM
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Fixed: Double Dragon 3:
Symptom: Dead/missing parts
IC 79, one of the pair of system ROMs was missing. Burned a replacement EPROM and installed it but board would not boot. Inspected the bottom of the board closely as it looked like it had been badly abused. Fixed 3 shorts (pins from a chip laying over shorting a trace) on the bottom of the board and patched 8 cut traces. Board booted but had no sound. Installed a missing YM3012 Sound DAC (Pulled from a parts board) but still no sound. A closer inspection showed the Z80 CPU had NO activity on its address and data busses. No logic highs, no lows, just dead. Replaced the Z80 and had the same symptoms. Checked the reset line and it was cycling from low to high but doing it incredibly fast. Traced the reset circuit back and found legs in the board but no capacitor in the circuit. Replaced 1 cap in the reset circuit and played the game through to the end.
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Fixed: WWF Superstars
Symptom: No video sync
Video Sync line was dead. Traced it back to a resistor that had burned. Traced that back further to a 74LS05 IC that had input and no output. Multimter confirmed the output of the 74LS05 had shorted to ground. Replaced the 74LS05 IC and burnt resistor to fix the sync problem.
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Model: Combatribes
Symptom: No video or audio. Only a light blue screen.
The board only gave a light blue screen and had no audio. There were no video artifacts or other garbage on the screen. Coining it up made the screen flash and there was good activity on the main CPU. This was a good sign as this game flashes the screen when a coin is dropped during attract mode.
Tapped on the 2 surface mount chips (IC33 and IC84) and saw video artifacts of the game playing. Reflowed the solder connections on both chips to fix the video.
Inspected the board and found a gouged trace on the bottom of the board leading over to the sound subsystem. Patched the trace and replaced a broken 10uf electrolytic to fix the audio.
Replaced 3 broken 100uf electroltyics on the +5v line to finish the repair.
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Model: Combatribes
Symptom: Corrupt graphics and no inputs.
Resoldered the 2 surface mount ICs to fix the background graphics problem. Reseated the PROM at IC43 to fix the missing foreground graphics. Fixed a broken trace going to IC98 to fix the double text problem. Patched a broken trace to fix the input problems and tested.
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Model: WWF Wrestlefest
Symptom: Missing background graphics, no blue, and no audio
Resoldered the surface mount ICs but no change on background graphics. Replaced bad SRAM at IC41 to fix the missing audio. Replaced bad SRAM at IC 54 to fix the no blue issue. Replaced bad SRAM at IC27 to fix the missing background graphics and tested game.
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Model: Double Dragon
Symptom: Dead
Board would power up and display yellow and white garbage. Checked the ROMs and found garbage on the data lines. Replaced a bad 74LS244 at location IC12 and the CPU would try to boot, but still would not. Found that pin 2 of IC21, a 6264 SRAM IC was stuck high. Traced it back to IC 1, a 74LS157. The LS157 at location IC1 and IC2 were missing their select signal from pin 1. Jumpered pin 1 of IC2 to pin 1 of IC3 to fix the board. Replaced 2 broken caps and tested.
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Model: Double Dragon
Symptom: Dead
Board would power up and display yellow and white garbage. Checked the ROMs and found that pin 22, one of the control lines, was dead on IC 25, 24, and 23. Replaced a bad 74LS139 at board location IC72. Board would then power up and run, but would not recognize any inputs. Replaced a bad 74LS138 at location IC90 which allowed it to read the DIP switches, but still no inputs from controls. Checked signals against a known good board and discovered that pin 4 of the CPU, FIRQ*, was not going low when a coin was added. Replaced the 74LS74 at IC73 to fix the board. Replaced 2 broken power decoupling caps and tested the game.
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Model: Double Dragon
Symptom: No sound
CPU checked good by substitution. Cleaned the legs on the sound program EPROM. Chip select signals looked good but the SRAM was never going into write mode so the subsystem was never fully booting. Checked continuity on the data and address lines and found a bad connection between the sound ROM and RAM on D3. Patched bad trace and tested the game successfully.
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Model: Block Out
Symptom: Dead
Replaced missing A1-2 EPROM and tested.
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Model: Double Dragon 3
Symptom: No sync
Replaced a shorted 74LS05 IC and a burned resistor. Tested. Board had no sound. The sound Z80 was dead. Checked the reset line and found it faulty. Replaced a capacitor with a broken leg and tested. Replaced 1 cap in the audio section to finish the repair.
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Model: WWF Superstars
Symptom: No audio
Replaced broken volume control. Tested game.
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Model: Ninja Gai-Den
Symptom: Dead
Replaced bad 8Kx8 SRAM at U3. Tested.
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Model: Ninja Gai-Den
Symptom: Dead
Replaced bad 24MHz crystal oscillator and 2 broken .1uf bypass caps. Tested.
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Model: Double Dragon
Symptom: Dead
Repaired 4 damaged traces. Tested.
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Model: Double Dragon
Symptom: Stuck in boot loop, incorrect colors, and no sound.
Replaced bad 6809 sound CPU. Had output from the DACs but not the FM sound. Replaced the YM2151 sound chip to restore FM sound output and the dead M51516L sound chip to restore audio to speakers. Replaced corroded caps C1 and C2. Replaced bad ROM at IC26 to fix the booting problem. Repaired multiple damaged ground traces on IC 102 and 103 to fix the color output issue. Tested.
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Model: US Championship V'Ball
Symptom: No audio
Replaced bad 1000uf @ 16v axial capacitor between the audio output IC and the JAMMA edge connector. Tested.
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Model: Double Dragon
Symptom: Dead
Replaced several failed logic chips, 2 corroded sockets, cleaned pins on 2 Program ROMs, and patched one bad trace. Board was still not coming up. Replaced bad 64k SRAM and tested. Board played but had distorted audio with sampled sounds. Replaced bad Mask ROM at 21J-7 with a 27512 EPROM and tested.
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Model: Double Dragon
Symptom: Graphics corruption
Replaced corroded 27256 EPROM and socket at IC20 on the CPU board. Replaced bad 74LS157 at IC140 on the video board. Tested.
NOTE: There are plastic insulators used on the standoff screws as they go through the video board for the screws closest to the board interconnect cables. If these insulators are not there the screws could cause a short between +5v and ground if they contact the sides of the holes as they pass through the boards. The factory has these in place and if you have a board that is missing the standoffs you can use the screw insulators used for mounting transistors.
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Model: WWF Wrestlefest
Symptom: Dead. Garbage on screen.
Removed a solder short between the pins on one of the SMT customs then reflowed the 3 custom surface mount ICs. Replaced a bad cap and the board sprang to life, but was short lived as it would die when tapped. Replaced bad 24MHz crystal oscillator on the CPU and tested.
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Model: Double Dragon
Symptom: P1 and P2 button 2 dead
Replaced 2 shorted customs on the inputs and tested.
NOTE: If the JAMMA connector is installed upside down the 12V connection will feed right to the P1 and P2 button 2 connections, damaging the customs used for buffering button inputs.
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Model: Double Dragon
Symptom: Incorrect colors
This board was tough to track down as it was missing signals, yet none were missing. Replaced IC67. Only its lower 4 bits were in use and they were tied to the lower four bits of IC68 which was why it was hard to track down. They were both Fujitsu 74LS245 ICs so they were both replaced.
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Model: WWF Superstars
Symptom: Smoked inputs
JAMMA harness was connected backwards and the board smoked near the connector.
Replaced 2 combination capacitor/resistor SIPs in the input circuit and tested. Replaced a 100uf cap on the back corner of the board that had one of its legs half ripped out. Retested.
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Model: Double Dragon 3, The Rosetta Stone
Symptom: Distorted sound and bad sync.
Replaced 2 broken capacitors in the audio section to fix the sound. Replaced two broken power filter caps. Cleaned the dirty edge connector with a fiberglass pencil to fix the sync issue. Tested.
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Model: Double Dragon
Symptom: Dead
Replaced bad EPROM 21a-1, reset DIPs, replaced multiple physically damaged caps, and tested.
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Model: WWF Wrestlefest
Symptom: Corrupt video
Removed, repaired, and reinstalled a custom with bent pins. Reflowed 2 other custom ICs. Repaired 4 gouged traces under text character ROM socket. Repaired broken solder joints on 2 background ROMs. Tested.
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Model: Double Dragon II
Symptom: Garbled graphics. Game crashes.
Board had corrosion issues in the sockets.
Replaced the 4 50-pin board interconnects and the 2 cables. Replaced 12 sockets on the CPU board and cleaned all the ICs before reinsertion. Did the same with 8 ICs on the video PCB. Board booted but the graphics for "The Revenge" was corrupt and in attract mode the characters were garbled. Address line A11 was stuck high on the graphics ROMs. Replaced a bad 74LS273 IC to fix that. During attract mode one of the enemy characters was corrupt. Replaced bad mask ROM on the video PCB and tested. Replaced four physically damaged capacitors and retested.