(Topic ID: 228542)

Williams Fire won't boot up

By boosman

5 years ago


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#8 5 years ago
Quoted from PinMonk:

Take that ribbon cable off so there's a clear view of the battery holder area and shoot another picture or two (make sure you select "original size" from the dropdown menu when dragging the pictures onto the post)
Also on System 7, 7 flashes indicates Rom0 is bad. Maybe try pressing on them to see if the pins have oxidation on them?
0 - Test Passed
1 - IC13 RAM Faulty
2 - IC16 RAM Faulty
3 - IC17 ROM 2 Faulty
4 - IC17 ROM 2 Faulty
5 - IC20 ROM I Faulty
6 - IC14 Game ROM 1 Faulty
7 - IC26 Game ROM 0 Faulty
8 - IC19 CMOS RAM or memory protect circuit faulty
9 - Coin-door closed, memory protect circuit faulty, or IC19 CMOS RAM Faulty.

Not sure what System 7 error codes have to do with a System 11 MPU.

#10 5 years ago

I have made a few middle of the day posts in other threads and I can say I was not thinking too clearly.

1 week later
#21 5 years ago

Definitely, replacing C30 would be my next step.

Edit...on the CPU board

3 weeks later
#34 5 years ago

I would test out all the traces from the IC pins of U54 (not the back of the board) to where they all go to. It is possible since it had an IC socket installed previously, could be a damaged trace under it.

#35 5 years ago

Also get a new C30 22uf 16v or 25v axial electrolytic capacitor. I seen old ones sometimes cause false PIA failures. This is why I had suggested the C30 previously.

#37 5 years ago
Quoted from boosman:

I have checked all the pins that go to U54 and they all work exept 33, should I solder a wire to connect it?

Yes, add a wire. Retest with the original PIA that was in the board to see what happens.

#39 5 years ago

Bummer. I thought the socket was installed by someone else.

#40 5 years ago

Where did you purchase the PIA from?

1 week later
#43 5 years ago

Where did you purchase the PIA from? There have been quite a few fakes being sold at many places.

#44 5 years ago

I would retest all the traces to and from the U54. Also check adjacent pins of the IC socket so that there is no short between pins? Do you have a logic probe?

#46 5 years ago

So the middle (diagnostic) nor the blanking LED or LED at all?

#48 5 years ago

So your problem now is worse than last reported, which the diagnostic LED was blinking to give you the U54 error code. So either the jumper you added is in the wrong place or the PIA is in backwards.

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