(Topic ID: 242025)

Mousin Around - slowly powers itself down / back up.

By CharlesZ

4 years ago


Topic Heartbeat

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  • 82 posts
  • 15 Pinsiders participating
  • Latest reply 4 years ago by Crash
  • Topic is favorited by 2 Pinsiders

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#6 4 years ago
Quoted from Grizlyrig:

Maybe the capacitors are dried up and not keeping up...
Would love to see a video of this happening and let others more experienced see it to give a better diagnosis.
-Mike

I agree it's something with the capacitors - or heat related to connectors. Try reseating all the connectors and seeing if it the behavior changes (that way you know it's time to replace them, as well.... start with any that go directly to the transformer.)

1 month later
#80 4 years ago
Quoted from CharlesZ:

That MPU board has been working fine for the last two days so I thought I would report to everyone. While checking the board for damage I had pulled each chip that was socketed. When I went to clean the pins of PIA U51 with my fiberglass brush I observed that pin 37 was dangling and hanging on by a thread. I was able to tack it up back on firmly with a little solder but decided to swap the chip with a spare. After doing so the machine is working fine for the last few days and immediately powers up. Pin 37 is for the IRQ lines. Would this add up as far as causing my slow power up and earlier slow power down?

It depends on what it was doing if it was generating a bunch of spurious IRQ signals, maybe. That's really hard to say for sure, and it could have easily been something with one of the other socketed chips you were cleaning. I'm sure you're happy it's fixed!

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