DENON AVR-5600 AV RECEIVER NO POWER AT ALL, UN-SUCCESSFUL REPAIR. TOO BAD.

A really nice Denon AVR-5600 receiver from the 90's came in that was totally dead, not even a standby light. I tried a factory reset by holding 2 buttons down while powering on, nothing. After some troubleshooting I determined that the main microprocessor that actually drives the standby light, and main power relay was not responding at all. It has all of the required inputs, reset, power down, keyscan, and clock crystal, but no serial data or serial clock at all. I deemed the main microprocessor as being bad. Too bad, this is a 140 watt per channel receiver and I hated not be able to repair it for my customer.
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00:00 Intro and diagnostic
01:47 Initial troubleshooting
03:53 Power supply troubleshooting
04:53 Bad microprocessor?
05:35 Verify inputs and outputs
07:22 Replacement receiver available?
07:49 Closing words

Видео DENON AVR-5600 AV RECEIVER NO POWER AT ALL, UN-SUCCESSFUL REPAIR. TOO BAD. канала NorCal715