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Author Topic: Misc Bootleg Games  (Read 11237 times)

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Offline channelmaniac

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Re: Misc Bootleg Games
« Reply #20 on: December 27, 2020, 12:51:41 AM »
Model: Terra Cresta
Symptom: ROM NG on screen

2 of the Program ROM had weak bits so I reprogrammed all the Program ROMs and the 2 background ROMs on the CPU board. ROM NG. Replaced all the ROM sockets to find ROM 4's socket had a broken pin under the socket for the D4 (Data 4) pin. Cleaned the ROM legs on the Program ROMs and background ROMs. Tested. Board booted but had bad sprite and text layer corruption and no sound. Replaced the ROM and RAM sockets on the video board and cleaned the ROM legs. Replaced 2 74LS157 and reprogrammed all 4 sprite ROMs and the text layer ROM. Sprites were fixed, but the text layer was still corrupt. Replaced the Fujitsu 74LS273 next to the text layer ROM to fix that issue, but that layer had sparkling issues. Replaced the text layer ROM to fix that. Reprogrammed the sound ROMs to fix the sound issues. Game would play but player could not shoot. Replaced partially shorted ceramic capacitor in the Player 1 fire input circuit. It was reading 820 ohms across it. Tested game.

Reprogrammed 3 new ROMs to replace the 2 existing ones and replaced the YM2203C sound chip with a YM3526 sound chip to upgrade the game's sound. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Misc Bootleg Games
« Reply #21 on: January 13, 2021, 11:38:38 AM »
Model: Gallag (Green PCB)
Symptom: Fails to boot

PCB would boot through self tests and lock up after the explosion which means one of the sub-CPUs are not running properly. Discovered the PCB had some kind of hand made module installed in ROM 5's socket. Removed it to find severe corrosion under it. It appeared to be some sort of NiCd battery backed score save module.  Removed the socket, cleaned the PCB, and installed a socket and newly programmed replacement ROM. Removed the extra wire wrap socket from the daughterboard used to raise it up above the custom module. Cleaned the daughterboard pins and straightened them before plugging it back in. Tested PCB - missing colors and no sound, except for the explosion. Replaced the output color PROM which had pin 9 missing to restore the proper color outputs. The 74LS273 latch in the sound circuit had pin 11 stuck high, which is the clock pin for moving data across the chip. Traced that back to a bipolar PROM chip. Cleaned pin 10 of the PROM and reinstalled it in its socket to finish the repair.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Misc Bootleg Games
« Reply #22 on: January 18, 2021, 09:14:58 PM »
Model: Double Dragon boot
Symptom: No sprites

Replaced a 74LS244, 74LS245, and 2018 SRAM at IC7 and tested. Installed missing standoffs and retested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Posts: 2472
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  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Misc Bootleg Games
« Reply #23 on: January 26, 2021, 02:51:36 AM »
Model: Time Pilot Bootleg
Symptom: Graphic corruption and crashing

Replaced dead 74LS04 at H11. It was used in multiple places around the PCB, including inverting one of the enable lines to RAM causing the corruption. Patched a cut trace to fix an orange text background color problem. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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  • Posts: 2472
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  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Misc Bootleg Games
« Reply #24 on: February 22, 2021, 11:54:01 PM »
Model: JY-PAC (JAMMA bootleg Ms. Pac Man)
Symptom: No audio

Recapped the audio section and resoldered the audio amplifier IC. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
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  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Misc Bootleg Games
« Reply #25 on: July 11, 2021, 10:04:49 PM »
Model: Green Beret
Symptom: No sync. No sound

Board had a JAMMA adapter soldered to the edge connector.

Traced connections and found the Red and Sync signals swapped. Fixed that and found colors were off and the audio amp IC let out its smoke. Found the Blue and Green signals swapped and -5v connected where +12 should've been. Removed all the wires and solder from the edge connector and rewired the JAMMA adapter using a proper 36 pin edge connector. All the player and coin connections were swapped around. Finished fixing the adapter and tested. Replaced blown audio amp and the 4 capacitors in the sound section. Tested. Reset DIP switches and retested. Coin settings could not be set to 1 Coin 1 Credit for Player 1. Found a factory solder short on Bank 1 DIP switch 1 between the switch and a via. Removed the short and was able to get the board set to 1 Coin 1 Credit. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Misc Bootleg Games
« Reply #26 on: September 22, 2022, 01:55:18 PM »
Model: Strikers 1945
Symptom: Missing input on Player 2

Replaced shorted 74LS245 in the input circuitry and tested the associated resistor pack. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Misc Bootleg Games
« Reply #27 on: December 30, 2022, 01:22:12 AM »
Model: Cadillacs and Dinosaurs (single PCB boot)
Symptom: Graphics corruption

Replaced bad 84 pin PLCC socket. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Misc Bootleg Games
« Reply #28 on: October 08, 2023, 03:42:05 AM »
Model: Double Dragon Bootleg
Symptom: Dead

Reseated loose ribbon cables. Tested. Board missing FM music. Replaced 3 1458 OpAmps and fixed an incorrect jumper wire. Replaced 1x .1uf, 5x 10uf, 2x 47uf, 2x 100uf, and 2x 220uf caps in the audio circuit. Reattached audio amplifier as it had multiple broken legs causing audio to come and go as the board was tapped.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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