SYMPTOM: So bad off I did not attempt power up.
FIXES:
1. Scratches on the bottom of the board, some very deep. All bad looking traces beep tested okay.
2. Several pins on various components touching and smashed around. Everything bent back.
3. Amp missing heatsink. I got lucky and found a heatsink that would work on the amp. After two screws and some thermal grease all was good.
4. Parts broken on component side replaced: Three disc capacitors replaced, one tantalum cap replaced.
5. Component side robbed of all EPROMS. Three of seven program EPROMS burned.
At power up these fixes gave the board some life. I have full sound. I could coin up and play a game resembling a black and white Atari 2600 game. Good! I will continue this log once I find four 2Mbit EPROMS (I have none) and when my cheapo USB EPROM programmer gets here. Time to learn some Engrish
EDIT (see below)
6. Using 27c400 chips with doubled code and pin 1 on each tied to ground, I was able to duplicate the mask ROMs.
Game works!!!
FIXES:
1. Scratches on the bottom of the board, some very deep. All bad looking traces beep tested okay.
2. Several pins on various components touching and smashed around. Everything bent back.
3. Amp missing heatsink. I got lucky and found a heatsink that would work on the amp. After two screws and some thermal grease all was good.
4. Parts broken on component side replaced: Three disc capacitors replaced, one tantalum cap replaced.
5. Component side robbed of all EPROMS. Three of seven program EPROMS burned.
At power up these fixes gave the board some life. I have full sound. I could coin up and play a game resembling a black and white Atari 2600 game. Good! I will continue this log once I find four 2Mbit EPROMS (I have none) and when my cheapo USB EPROM programmer gets here. Time to learn some Engrish
EDIT (see below)
6. Using 27c400 chips with doubled code and pin 1 on each tied to ground, I was able to duplicate the mask ROMs.
Game works!!!
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