Hello all avid lurker here. Need some help with a amplifer board from an old panasonic surround system. This is purely for learning purposes as I hate to see perfectly working electronics go to waste. Its a amplifer board that relies on TDA8920bj. I wish to try and use it as a basic amplifer. I'm kinda stuck on how to get a signal to pass threw it to speakers. From what I have researched I need to apply 30v+- for power. Then 18v to the fan circuit as this seems to control the signal from what I have seen in the service manual. Also 5v to the mute circuit to get the chip to go into the right mode. I've done all the above but so far all I've gotten is buzzing out the speakers but no music. Any help would be great as this seems to be a great chance to learn from as I've started to jump down the rabbit hole of audio and circuits. I've attached documentation on the circuit but if anything else is needed I have the service manual. The source signal would be either PC or phone. I'm still a newb so I apologize for bad grammar or understanding. Amp was from a panasonic sa-pt650
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