.. Have a FLM-373B Polaroid 37" Flat Panel LCD TV. Turned on one day and have what can be described as a "helicopter buzzing" sound coming from both speakers (and anything I plug into the headphone jack). Other than that I have no sound no matter the volume control. I have clear video picture, just no sound other than the buzzing. Depending on the video source selected the volume/freq/repetition of the buzzing changes, only on the HDTV coax cable source does the sound appear to stop, but still no other audio. I already replaced the OEM capacitors as per the post on FixYa.com but still have the same current issue.
Your model has all the audio and video circuits that are all within the Control Box unit which has to be replaced as a unit. You can get one at the following link. You would have to leave them a email as they dont list the polaroid Control boxes, But I know they have one for your model. Just click on the " contact Us" link and let them know the model number they respond quickly.
http://servicemanuals.vstore.ca/
This is what the control box looks like.
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