Hi everyone,

I am a newbie at repair, although I have a background in basic
electronics. I am working with a Pioneer VSX-D409 receiver that
doesn't seem to want to stay on. When it is on for any length of time
- even seconds, there is a click, and it shuts itself off.

1. There is no visible sign of component damage (burnt resistors, I
believe there are two fuses, good continuity, no blown up caps etc).
Board is clean.

2. The voltages comming to the transformer from the AC outlet appear
good, as do the ones leaving it.

I am not really sure where to start with this! If anyone has any
ideas, they would be much appreciated!

Thanks,