Hi,

I recently bought a MSFrankenstein, but got a problem with the sound: an irritating noise, kind of buzzing sound.
Model : 520-5077-03

Already done/checked;

Voltage to print and voltageregulators ok.
Speakers+wiring ok
TIBPAL on U19 & U20 replaced
TDA op U26 replaced
BSMT2000 Chip socket-chip both tested in working soundboard and ok.
End-amplifiers tested and ok.
RAM replaced, voltages ok, C30 replaced
Ampilfiers tested and ok.
U35 tested, feets from socket U26 also ok.

Anything else i could try?