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Yamaha TSR-7810 receiver power drift

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    Yamaha TSR-7810 receiver power drift

    Apparently same as RX-V681/RX-V781/RX-A760/RX-A860

    Everything working fine when plugged in and turned on.
    Output voltages on all speaker terminals are few mV.
    As time goes by (10-20 minutes), FR chanel goes to 10mv>100mv>200mv>300mv and up to 3V and then PROTECTION kicks in.

    Very strange issue. Can't find anything blown/overheating/shorted/open.
    All diodes and transistors checking out OK. Resistors too.

    Can't find service manual or schematic....

    Any help is greatly appreciated.

    #2
    Re: Yamaha TSR-7810 receiver power drift

    You got any high resolution pictures to show?

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