Picture looks like photo negative when power is reapplied
When I turn the TV off and then go to turn back on now matter how long of a period of time the TV has been shut off when it is first powered back on, the picture looks like a photo negative. It takes as long 4 to 5 hours to warm up before normal picture returns.
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see a tech,sounds like your tv is in need of repair if its under warranty send it back,if not be prepared to spend some cash.sounds to me your transformer and/or the capacitors have failed,its a common problem for these units, easy fix if you have some electrical experience. but once theses tv's reach this point its time to see a tech or get a new tv.
There are various reasons for this. Moisture inside the TV, dry solder on boards, dry/leaky capacitors on the board etc. Try changing the power outlet and ensure that it is giving out the voltage required. If nothing works, better refer it to a qualified service technician.
Take a look for bad capacitors, but it's much more likely that there's a cold solder joint somewhere. I'd start with the power supply circuit (be careful, discharge all large caps first) and just retouchup all the solder connections on the larger components and cables (ie, stay away from the tiny surface mount stuff) Of course I am assuming here that you know how to solder in the first place. If you don't you will probably have to take the unit in for repair.
One of these circuits are failing, there are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc. http://en.wikipedia.org/wiki/Capacitor_plague Please post back what you find.
I'm not sure what TV model you have. But, thing I can tell you is the most common problem.
Most of the time with flat panel TVs, the power supply for the screen fails. And the TV normally turns itself off to protect other parts in the TV from being damaged. Basically " Protection Mode".
You can try leaving the TV unplugged for 30 minutes so the TV can reset itself; then try again turning it on. If it doesn't work after that, it's time for the TV repair shop.