Hi everyone,
I’m working on a
Denon AVR-X4000 that goes into
protection mode (fast red blinking LED) shortly after the second relay click.
According to the service manual, a
fast red blinking LED indicates a
DC detection (DC_DET) or ASO (abnormal current) fault, meaning the unit is detecting a potentially dangerous condition on the power amp or power supply side.
Here’s what I’ve done so far:
- Fully opened and cleaned the unit (a lot of dust inside)
- Removed and visually inspected the AMP board → nothing visibly damaged or burned
- Testing is done with
...
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