I have had sound distortion on some channels, not all, on this TV since I purchased it - If you turn the volume up to try and hear the conversation over the distortion the louder the scratchy distortion gets - As I said, this only happens on some channels not all, but if this TV was only for certain channels, they should have put that on the box - I see (NOW) since I have had this problem that some other people have complained about it before in the reviews of this TV, but that doesn't help me now!!!
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The unit will need servicing, I would not recommend you poking around with the scope circuity as there is up to 580v there and it will ring your bell. I have worked on several 4400's and nursed them back to good health.
I SUSPECT THE CHANNEL IS BLOWN.YOU COULD TRY OPENING THE UNIT AND SEE IF THERE IS ANY GLASS FUSES.ONE MIGHT BE BLOWN.IF NO FUSES THEN TAKE IT TO A TECHNITION FOR REPAIR.THAT WILL BE YOUR ONLY OTHER OPTION.I KNOW,I HAVE HAD THIS HAPPEN TO ME.GOOD LUCK
Resistors are good at causing distortion, you might spot one that has burned or broken. If the distortion is in both channels, which by what you say it is, then you might be looking for something common to both channels. Perhaps an IC.
initially you want to think bad solder joint, but it think its a bad mosfet or rectifier or diode. it would be hard for an untrained person to identify your problem let alone an experienced tech. it may be time to move on to another amp. in my shop it would be at least 65 bucks for the repair. so where did the "heat"/energy go from that point and what parts were affected. there may be a domino affect. burn one part, not usually. yostamplifier.com
I would think it is your cable converter. Try hooking the cable directly to the TV without the converter. Pick some channels in the lower range and see if they have the same distortion as the cable converter. Thanks. Let me know what you find.
Check the converter box. Many have a volume setting that is usually set very low at the factory. On the remote control for the converter check to see if there are volume buttons. If so, change the converter box volume higher, to a level that makes the TV audio level "normal", then use the volume control on the TV for adjustment as you watch. If you set the volume on the converter box too high, you may get some distortion in the audio from your TV. So adjust the converter box to find the proper output from your TV without distortion.
Well, the nice thing about the newer amps is that the actual amp
circuitry is all contained in a module and you don't have to do much
troubleshooting. Just replace the module for that pair of
channels. Bad news of course is the modules can be pricey.
Should say right on it the part number, order it from mcminone.com or
whoever, solder it in, use new conductive grease (many times I think
these modules fail because the grease gets old, the module overheats
and toasts) and you should be fixya'd
it sounds like your IR board is going out, its easy to replace and is inexpensive usually about 10.00 plus tax and shipping, and very easy to install, its one of the few parts you can buy for these models outside of the 479.00 dollar control box.