Hoping for some help. My Gorgar was working fine and went on the fritz. When you turn it on either game boots with an “8” in the top left and “4” in the lower display OR an “8” and a blinking “6” one space away from it in the upper left and the “4” in the lower display OR alternating zeros in the main displays and a zero in the lower one as well. Eventually, the “6” goes away. My best guess was that it was booting in audit mode but I cannot get it to go into attract mode let alone start a game. When I press the self test button on the MPU, the leds flash twice so I think the MPU is okay? Anyway, regardless of the coin door position, the result is the same. The flippers work as well when the buttons are pressed and then game makes a “hit target” sound when it is first turned on. Any help here would be greatly appreciated!!

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Guessing it might be the 5101. When it comes up with the zeroes in the display, it appears to be some sort of display test as you can cycle through the digits 0-9 either automatically or in increments. While I was doing this, I smelled and saw a little bit of smoke but couldn’t detect where it originated. The original 27 ohm resistors seem to be super hot. It still boots in audit mode and while it appears to be cylcing through the audits menu, you can’t really tell and you can’t get out of the menu. Now when you press the diagnostic button, the leds blink once, come back on and stay on which seems to indicate the 5101.

I don’t have a “confirmed good” driver board to try. May just buy one to see. It seems that when you get the symptoms I’m getting, there’s something amiss with the driver board. The MPU seems to have som of the sockets replaced. I haven’t separated the boards either so it may just be that damn molex connector. Last time I had them apart, I reflowed the joints.

Okay, I’ve now tried a good driver board. Wiped the 40 pin contacts with isopropyl and installed it. The machine does the same thing only it now says “Gorgar” when you turn it on. Not sure what to do next but it would appear that the issue is in the MPU. Does anyone have a good recommendation for someone to rebuild system 6 boards?

Problem Resolved! Issue was that the coin door switch was malfunctioning. I haven’t replaced it yet but am pretty sure that it is the culprit. Swapping the 5101 didn’t do anything. I noticed that the switch didn’t feel right when I was checking it so after jiggling it, the game booted and went into attract mode. Thanks to all who tried to help.