This Onkyo wouldn’t switch on. I quite like these little units as they’re compact and unlike big AV receivers don’t have hundreds of screws to remove to get anything out!
The entire power supply board in this receiver is attached to the mains transformer by soldering it directly to pins on the transformer which makes taking the board out difficult unless you take the entire transformer out.
Anyway, a failed capacitor in the PSU was preventing a power good signal getting to the CPU and once it had been replaced the unit burst into life. The capacitor is next to a regulator with a big heatsink on it and a high wattage resistor so I presume the heat got to it.
If you have one that needs repairing please contact us with the fault description. Shipping costs in the UK are about £8.50 each way for this size unit.
I’ve uploaded a video I made of how to repair it to YouTube.