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.
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