Hello, its possible the TV lamp unit has played out.
If you have the tv manual, there should be information on ordering parts and the lamps etc and you will need the part # and also find out who carrys them and other items for your unit.
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Look through the ventilation slits at the back of the TV with the room lights out. If you do not see white light light bleeding through the back, you have a back light failure. It could be the inverter circuit which lights up the CCFL ( cold cathode fluorescent lamp ). You will need professional help to replace it and could cost you about 70 to 100 $ to fix.
I've encountered that experience before it needs some technical knowledge because the raster for rgb on your lcd is going bad and the video signal out put cable is mis aligned get someone to re align the raster and your video signal output cable
With no video and the the colored stripes, it sounds like the LVDS cable needs to be reconnected to the LCD control board or the control board itself is bad. If the unit is only 3-4 months old, it should be covered by warranty
The power supply failed on your LCD and will need to be replace or repair. In about 95% of the time the power supply failed due to defective capacitors, shorted diodes or open resistors.
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The power supply is defective on your LCD and will need to b e replace or repair to the component level.
Service parts seem to be a bit hard to locate now a days.
You can write to firstname.lastname@example.org for more info.
A wire in the set got too hot and broke away, had to pay £140 to get it fixed, was told it's quite comman in alot of lcd tv's, as in all makes... I t should have been for a lcd bush 37 inch tv,,,not that it makes any difference it applies to all flat lcd screens, I just posted in the wrong part to begin with.. Sorry.