A3640 problem & A4000 questions

[Jeff]

Some A3640's also had some caps installed backwards at the factory. I have at least one rev 3.1 like that. Sometimes replacing the small surface mount capacitors can bring them back to life.

Good Luck,
Jeff

[Jeff]

Look very carefully at the polarity, some are MOST LIKELY in backwards from the factory. These are probably the ones that are corroded at the bottom and have failed.

They are surface mount and the pads on the A3640 lift very easily so you have to be careful. Perhaps practice on a junk board with similar parts and get comfortable if you haven't done this style before.

Good Luck,
Jeff