I was asked to repair a Mackie Thump TH-15A Powered speaker by a friend. It powered on and everything looked good but there was no sound coming out. I checked the speakers and the power supplies but everything was just fine. However, the computer board was getting really hot. It had 3.3 volts coming into a voltage regulator but only .5 volts coming out. I tried easter egging the capicitors and it turned out to be the tiny little .1 uF capacitor that was shorting out the power supply. The correct output is 1.2 volts.
This is what the guts look like, we are going to zero in on the logic board.
This is what the powered speaker looks like once it was back together.
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