(Topic ID: 258717)

AS-2518-35 Continuously Rebooting

By JethroP

4 years ago


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  • 48 posts
  • 8 Pinsiders participating
  • Latest reply 4 years ago by JethroP
  • Topic is favorited by 1 Pinsider

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#13 4 years ago
Quoted from JethroP:

Yes

I've actually been looking at those recently. I will order one today.

I've thought the same thing. I've hesitated to remove the U8 socket because I'll probably need to repair/jumper most of the connections as the traces are shot. What I have done is verify continuity from the chip legs on both U7 and U8 to the board connections, and confirmed there are do shorts from pin to adjacent pins. At lease I think I didn't miss anything. I believe this confirms that the chip to socket connections are solid.

check u8 connections back to the cpu chip and the enabling stuff. A lot of the connections at U8 go off in multiple directions. Even if it connects to u7 to may not connect to the cpu/roms/pia etc.

#40 4 years ago

A short between upper address bits at/near the CPU chip can cause the 7 flash reset. I had a MPU working OK when set to hot hand, change it to Kiss and it 7 flash crash. Inspecting around the CPU chip, which was a used pull, and it had a whisker of solder at the plastic package shorting two of the near upper most address pins together. That was a rare odd case tho.

Even tho U8 looks rough like the problem is probably around there, at this point I think I'd get some known good ROMs. Your original ROMs have legs that look really tarnished. The Bally POST checksum test is not fool proof too. Those single wipe IC sockets are not the best either.

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