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I have had similar problems with a few tvs in my day im not for sure but i think its a circuit on the motherboard is not getting a good connection some how or possibly dust .dust and smoke are a tvs worst enemy besides reckless teens with a baseball bat! I would suggest taking the back off and cleaning the motherboard and checking the fuse and make sure that its not getting ready to blow. when tvs have problems coming on or staying on this is a good indicator that something is not getting a good solid connection.i would check the motherboard for burnt spots and if there is then you need somebody that can soder and replace any diode or ressistors that may be burnt. Hope this helps if i can think of anything else that can be causing this problem. Good luck! I hate to hear when nice big expensive tvs mess up!!! Hope it works out for you!!!
I have had a similar problem with my tv, it has something to do with the power supply.Try unplugging your tv from the AC outlet. While unplugged from the power supply hold down the - volume control and then plug the tv back in while holding down the - volume control. It should bring up the service screen. If the screen turns on and is blank then it may need to be brought in for repairs.
If the screen does turn on, either blank or with the service menu, turn off the tv and unplug it from the power supply again. With it still unplugged hold down the power button on the tv and then replug in the tv. continue to hold down the power button until the tv displays a video signal on screen.
It needs to be demagnetize but the tv has it's own demagnetizer and it does it when you turn the set on,you need to unplug the set from the wall for about 15 minutes and then plug it back in and turn it on and the splahes should go away,if you have placed speakers on top of the set or in its sides remove them because they will cause this problem or if you have move the tv while it was on or the set was dropped.Let us know what you find.
I'm having the same exact problem with mine! I'm looking for a solution also. I opened up the back of the TV and blew out the dust. Then I checked all connections. I put it back together and plugged it in. Now it doesn't make the high-pitched squeeking sound, but I still don't get a picture. My guess is the picture bulb is burnt out. I'm trying to find one online and am planning to fix it myself - wish me luck!