(Topic ID: 299541)

Gorgar strange controlled lamp issue

By Spraynard

2 years ago


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  • 26 posts
  • 7 Pinsiders participating
  • Latest reply 2 years ago by Spraynard
  • Topic is favorited by 1 Pinsider

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#18 2 years ago
Quoted from Spraynard:

Having a weird issue with my Gorgar. When I start a game there will be lamps randomly lit, and turning on and off. The lamps that are lit don't correspond at all to what I know should be happening. Scoring and sounds seem fine though. This behavior seems to correlate with heat -- when i first fire up a game it seems normal, but after it's been on a while it starts acting bizarro.
The other strange thing is it operates perfectly in test mode. Attract mode looks perfect, and all lamps flash when they should in test mode.
I should note that the MPU had pretty substantial alkaline damage when I purchased it. I went through it pretty deeply, removed all corroded parts, cleaned up traces, neutralized, ect. all sockets were replaced, as was the 40pin. I do recall the legs on some of the chips being very black. I cleaned them off, but I wonder if they were damaged? I don't remember which chips it was unfortunately.

Send a video of the lamp behavior progressing into the problem.

#22 2 years ago
Quoted from Spraynard:

Swapped in a different driver board. Seemed to last a little longer, but the problem still came back.
Also swapped out the ROM and CPU chips. No help.

Check for a corrupt IC 13 or IC 16 RAM both are socketed replace one at a time or swap IC 16 and 13 check if problem moves

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