The heat sinks were not good enough to keep the heat away from the leads and the heating up/cooling down of using the stereo over and over eventually cracked those solder fillets. The issue was cracked solder joints at the base of the power transistors where they go into the motherboard. Read more: //I have had the exact same problem on mine. Those types of pins are notorious for intermittent connections and soldering them will give you a solid connection. To fix that simply solder all those junctions.
This is caused by the long gold finger pins and sockets that fit the vertical boards to the mother board.
I still had issues with crackling when the unit was vibrated or bounced. This extra surface area keeps that solder fillet from cracking again. Basically forming a little piece of solder wick into the shape of an L and reinforcing this solder junction. What I did to solve the issue was to melt solder wick into that junction laying it along the surface of the lead and bending it at an L shape at the base, then adding extra solder along the wicks length both on the transistor lead and on the path on the mother board. I can temporarily fix the issue by simply reflowing the solder joints but it will happen again eventually. I have had the exact same problem on mine. I really can't play CD's this way, it's just useless. Would anyone have any idea what this problem could be? Both speakers sound clear with no distortion or other noise. I wired one speaker at a time, played a CD and listened to the speaker from 1 foot away, and heard no 'bad speaker or blow speakers', so I don't think it's a speaker problem. The Tech also said it could be a bad speaker (?). Last night I totally rewired the Receiver to Speakers (2) with new, solid coper core telephone wire, but that didn't change anything. I called the repair center and spoke with the Tech who worked on the unit, and he suggested perhaps bad speaker wireing. I can't turn the volume up more than about 1/4 % (of it's total amount of volume) or this "Overload" shows on the unit's screen. I just spent $170- on a new power supply, transformer and integrated circuits to control both, but that didn't stop the problem. I have a Technics AVG Control Stereo Receiver SA-EX800 that after 5 - 10 minutes goes into "Overload" and shuts down, I have to power it off, turn volume down and turn it back on.
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