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Sounds like backlight inverter board fault. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Screetchng sound are the common fault with this board.
Tv has no picture or sound; will go out while watching. The picture will go into a line and sound and picture will go out; shortly after that tv will turn off. Did this last nite and I did not turn back on until this morning, it worked no problem. On for couple of hours and now it's out again. What could be problem and how do I fix myself
1. Can you view a DVD correctly? Good video and sound?
2. If so, you can get an "external tuner" like the Digital convertor boxes that the government subsidized and hook that up to your cable....
It will work (if you answered YES to #1)
3. Cost to fix TV is around $120... (tuner board)
(Don't open TV ... high voltages in there...)
4. Cost to use an external tuner around $20
5. Cost to use only for viewing DVD's ... FREE
This looks as if a component has become thermally sensitive. The best way to find this is to use component cooling spray. It looks as if the problem is localized to the tuner section. Take the back off of the TV and turn the TV on, wait until the problem occurs and lightly spray the tuner section with the component cooling spray watch for any reaction, then if this does not work spray the Microprocessor and the LVDS section and watch for a reaction. The set should go back to normal when it does that section is the problem, try to localize the problem to one component. Then replace that component.
Hi, this is quite a common problem for plasma screens and LCD screens. The fluroscent backlight is more than likely faulty and would need replacing. The best thing to do is to take it to a service centre because there are no user servicable parts inside the plasma.