Receiver only works in Stereo Mode and won't allow use of subwoofer

When selecting Dolby or THX modes the signal turns to garbage within a short period. I will get correct signal to two speakers in stereo mode. Can't use the subwoofer for long before the signal goes bad for it even in stereo mode. Sounds like a main signal processing chip gone bad or something. I'm reasonably handy but not much of an electronics repair person. I'd appreciate any tips on how to repair. Thanks

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3,130 Answers

That sounds about right, about the audio processor IC most likly being the culprit. To repair this, a test tone should be inserted into the unit, and using an ocilliscope to trace the audio waveform through the circuit, and see where it craps out. There could also be a regulator componet from the power supply that is going out after start up and becoming intermittant. Sorry to say in this case there is no wasyy fix unless you have a schematic and the proper equipment. Time to take the unit into the reciver repair Place. Good Luck

Posted on Jul 23, 2006

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Receiver only works in Stereo Mode and won't allow use of subwoofer