I have a 1980 Williams Blackout (williams system 6) that I have had since October 2019.

Issue 1: It's been running great until about a month ago it starting booting without controlled Play field lights. A few flips of the power switch and it would boot up. Now I have the same thing happening with the GI lights on occasion and the displays. They sometimes don't work. I reseated all connectors.

Issue 2: It's got a remote battery holder and lately the game sometimes boots into audit mode. I've checked batteries and connection to MPU it seems to be good. Still when game is unplugged it loses memory.

Issue 3: This started today (9/8/2020). The voice board is not working when game is playing however if I hit the diagnostic button on the sound card all sounds and voice flies play as they should.

Issue 4: ones digit in player 1 and 3 flickers and sometimes is not lit then if I leave the machine on it's starts working like it should.

I believe the 40 pin was replaced last year my tech who refurbished the machine but I'm not sure. I have an extra one so I think I can replace. Is that where I should start with?

Thanks TP7 is where to measure that?

Pulled the power supply from the game to inspect it and noticed C15 the large filter capacitor in the 5V section is puffy and discolored on one end. So I think that is the culprit with the random issues I'm having. If not it's obvious that it needs to be replaced so just ordered a rebuild kit for power supply. It looks like my power supply had the caps in the 100v section replaced but the rest look original. Also noticed some of the pins on the connectors at the top of the power supply (5 volt section) are bent and it was a pain to get that wiring harness off. So I'll be replacing that as well.

And I just verified I have NO Voltage on TP7 so that is the issue. I think now I need to decide do I fix that are just install NVRAM.