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When you set the backlights to high it causes the inverter board to generate more energy, as well as consume more from the power supply, all the while both are generating more heat. If you have your set mounted (restricting the vents) and/or you regularly use the high setting, that could cause capacitors to bulge and leak due to excessive heat damage. I would open her up and have a look at the power supply and inverter boards. Check for bad caps or board surface discolorations.
This does not seem to be a power supply issue but rather an issue with the backlight inverter board. When the screen goes black, take a flash light and focus it on the screen from a close distance and several angles. See if you notice a very faint image. Try changing the channels to make it more noticeable. Try it and let me know
Hi, Basically it is problem of lcd panel (screen) but some times T-Con board (it is also part of lcd panel) replacement fix the issue. T-Con board is located top center of lcd panel at back and need to take off back cover of tv to see it, this board would be covered under metal shield. Expertise are required to replace this board and novice can damage lcd panel (screen) permanently. Thanks.
I went over the specs of the TV.
The max input for the VGA is 1360x768 at 60Hz. Anything higher will make the TV go bonkers.
I would try to get the resolution at 1360x768, then change the frequency to 60Hz.
One of four things happen when these lcd's get power problems. 1. They either go completely dead[no power with no lights] 2. Little green light will blink and go back to red with dtv briefly showing and then the tv screen go blank 3. Same as # 2, but with screen staying blank. The fourth is extremely rare, which is a shorted panel that makes the tv set behave like it's getting no power. All signal a bad tv, and the fourth is not usually repairable, requiring a whole new panel. I hear that power flows thru the panel, so that would explain how sometimes it will short out.