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Re: i have a panasonic ht730 home theatre system....
If the sound is distorted and is effected by the volume control, the problem is in the "front end". This is not a common problem, but is significantly less expensive to fix than the output section. Try turning off any surround mode and run the unit in plain stereo. Does the distortion still occur? I suspect that it will not. Update this with that info and I should be able to list the probable parts that need to be replaced.
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First thing is to check the wiring. a simple flipping of the positive and negative at the back of the theater box can fix this. I know they have the color coded wires and suppose to be plug and play but I see these reversed all the time right from the factory. If that does not work repost and I will follow up.
Try running the audio from each video source (NOT the TV, which is an output, not a source) to the HTR digitally so you'll get the best mutichannel sound possible. Then you can turn the TV speakers (assuming it has them) off for hi-end watching.
Normally this is a failure of the output amp section which is a single amp-pac. This part is available using the part number: RSN311W64D-P for about $95.20 and can be easily changed by anyone with audio repair experience. Add in your local repair labor rate for the total repair cost.
Unplug all of the speakers and power on.Its possible that one of the speakers is causing the protection circuit to activate.If powered on and subwoofer works start reconnecting one speaker at a time( after powered off) and retest each time.One Speaker may be bad.Its also possible the output ic is failing under a speaker load.There are no fuses related to this issue.If its not a speaker problem then the subwoofer will need to be serviced.
I would suggest that you smash
Philips HTS w/a hammer!
I had better sound from TV alone! Only 2 speakers put out sound from TV. Recordings from DVR can not be heard very well w/all volumes at max. System sucks! You get what you pay for! $2500 LCD TV sounds worse w/Philips HTS than my son's $300 TV! ALL cables hooked up as instucted!!!!
My Home theatre started to do the same thing today and I manged to get it going again by reseting the ratings password and changing the batteries in my remote. Oddly enough, I have never set a ratings password so I suspect the batteries caused the issue. Seems to be back to normal. Instructions for the reset are in the manual. Here's a link to the online one at Panasonics website http://service.us.panasonic.com/OPERMANPDF/SAHT730.PDF