Hi, I bought a used Yamaha TSR-5810 off eBay and the seller said it was in power surge protection mode. Just got the unit today, dead as a doornail. Can't enter SELF-DIAGNOSTIC FUNCTION. Of course they weren't honest in the listing. None of the button combinations work to bring it up. I have no standby light. I've tried unplugging for an hour and holding the power button for 60 seconds, but none of that stuff works so I am guessing it's an internal problem. Also when pressing the power button, I don't hear the relay click on at all.
I have a multimeter, but no advanced diagnostics equipment. I also have a copy of the service manual if anyone needs to see its schematics.
There is 120V from the wall coming into the receiver, I also checked the power switch for continuity and it is working I believe, beyond that, I'm not sure where to start. Any help would be great. Here is the diagram. I attached a PDF version to this post for easier viewing.
I have a multimeter, but no advanced diagnostics equipment. I also have a copy of the service manual if anyone needs to see its schematics.
There is 120V from the wall coming into the receiver, I also checked the power switch for continuity and it is working I believe, beyond that, I'm not sure where to start. Any help would be great. Here is the diagram. I attached a PDF version to this post for easier viewing.

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