“I have a TX-8020 that is a few years old. No sound is coming out although there is power in the amplifier and all cables are attached. Could it be a chip overheating? I saw a You Tube video suggesting that a heat sink be glued on top of the chip.”
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You need to determine if it is the receiver or the source component first that is not outputting the volume. Try the radio first to see if you get some type of noise. If it is the receiver makes zero noise on the fm, then the receiver is most likely broken. Its usually more than a chip, It could be an hdmi board failure or the audio board which is an expensive repair. I would recommending doing a full set up again including unplugging all the equipment. After reconnecting, plug everything back in and wait for all the boxes to reset, then test again if no sound comes out then it is most likely a board failure. You can try replacing or swapping the cables around, Believe it or not they do go bad sometimes. I had a power cord that just stopped working. I brought the receiver in for service without bringing the offending power cord and there was no problem found. I brought the unit back home and it worked. Then 3 months later it shut off again. I decided to swap power cords and the receiver turned on. When I tested the offending cord on 3 other devices, they failed to turn on. So you never know or assume anything when trying to diagnose audio issues.
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