I wish I had a solution--My DVD picture and sound is fine, but it takes about 30-40 minutes to get any kind of picture but it is broken--not clear at all - and the sound is all garbled, totally stops for seconds to minutes a a time. It is only a little over a yr old. I finally isconnectexd today and am going back to my cheap-o but dependable tv.
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Check connections in rear of television if connections are good check condition of RCA jacks and other connectors.Lots of times poor sound and vision quality is due to cheap or damaged connectors and/or wireing.
I have this tv aswell, and yes I will confirm that it does buzz quite alot, but all plasma tvs do, it is to do with how it renders images, the buzzing can be made worse by it being close to a wall and it reflecting back. I found that my tv stand some how amplified the buzzing when i got mine. I dont think its something you can escape.
Mine i notice also when scrolling around menus seems to have lines that follow your selection....not to pleased about that
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CHANGED Z SUSTAIN BOARD.PICTURE PERFECT.APART
FROM WHITE DOTS.. AND ALSO ALL FUSES AROUND IT .THINK IT COULD BE DUST OR FINGER PRINTS ON RIBBON JOINTS,,WILL
RE CHECK AND WIPE F/PRINTS TO SEE IF ANY CHANGE. GOOD LUCK
There are likely to be many poor connections in the power supply section that are causing this. If you can solder and the unit is no longer under warranty, you can try resoldering any connections that appear grainy or have rings. That may resolve the problem. If not, than one or more capacitors have changed value enough for the internal circuits to mal-function. This will take some test equipment to locate easily. Try resoldering first and update this with the results. I'll try to locate the most likely parts that could cause this.
I found this solution on another review, hope it works Model Number:Proscan 26" LCD HDTV w/ Built-in DVD Player26LB30QD "pro: good price, TV picture is clear and DVD player is compatible well. con: sound noise There was hum when I first turned the TV on, then I followed these instructions (found it from other review) to fix the hum issue: 1. Turn tv on 2. Input mode should be tv 3. Turn volume to zero 4. With remote enter 9 8 7 6 5. A menu will appear on left side 6. Arrow down to backlight and with right arrow key move number from 81 to 83, press menu button twice, 7. Turn up volume and listen if hum is gone." It works,no hum."