Does anybody have a schematic of this board? I have the same failure issue with all caps checking OK, and good voltages everywhere...8, 12, 14, 16, etc.., just really really low volume sound. There's got to be something simple but critical in the audio amplifier input path that affects both channels of audio somehow. The board is too small to visually track audio path. Need schematic. The three pin B1336 heat sink is warm, the 78M08 volt reg is warm and correct in and out voltages, 12 and 8, but the Audio IC501 is cool and with a heat sink fin should feel warm. So I think the problem is here. The output 1000uF capacitors to the speakers are also both good. Any ideas? This common failure has to be a common reason. What a shame, the whole rest of the unit works perfectly, display, buttons, knobs (tuner needed a little electronic spray but that's normal). What the heck here.