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From: William R. Walsh on 8 Mar 2010 14:48
Hi!

> I don't really need to know the DVD decoding methodology, just need to
> find the I/O pins to probe to determine if the laser pickup or the
> decoder board is bad.

My guess is that the datasheet includes everything, and that they're
unlikely to excerpt it. But you never know...and that was why I suggested
just giving them a buzz.

> Yes, I ESR'd the caps in the power supply, they're all good.

Good to know and have that out of the way.

> but every now & then, it will play CDs all day, cycling power several
> times, then the next day the same CDs just give "no disc" after
> spinning up and trying to focus 3 times.

Couple of thoughts...and maybe you tried all of these...

What about flexing/poking/prodding/abusing the main board to see if the
effect comes and goes? Have you tried putting it in a cold place for a while
or using freeze spray? How about setting it near a sunny window and letting
it warm up?

How does the solder on the connectors for the ribbon cable look? Anything
questionable there?

William


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