Hello all,

Been working on a CTC169BG5 chassis, the HOT was shorted, cause seems
to have been a high b+. so replaced all the lytics around the regulator
IC and C4402 which was open. Now the Set powers up and picture is fine,
but I hear this constant hum from the speakers, even when there is no
video signal.

All I can think of at the moment is to start tracing the audio output
from the IF stage and troubleshoot. Any other suggestions?

Thanks
Jay

Tracing audio signal from the IF stage?
Why? You have not ruled out the audio switching according to your post
by using the A/V input jacks.

Start at the A/V switch once you know which side is causing it, then
work your way either back or towards the audio outputs.

You are possibly going to find problems in the surface mount parts in
the audio volume control or switch circuit.