Metz ch696G1 dead

[BBHE]

Hi,

The set is totally dead. No light in standby led.

I've found some defective components and changed them:
TR1771, Dr1771, R1705, R1781, Si1703.

The set can now startup and it works fine.

But there is a strange sound (sounds like noise from a trafo). It's still there if I switch off the lautspeakers.

What can still be defetive? I asume that it is failure in the power supply.
TDA4605 perhaps?