Join Date: Jan 2010
Location: tropics @97% humidity
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repairing a switching amp is a hard (if not impossible) thing to do.
unless you have access to equipment to actually measure the waveforms then don't even try.
even if you do, there's so much going on with so many different design that make it almost impossible.
gone are the days where you could spot the problem by visual inspection and validate the problematic component with a cheap multimeter.