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Re: No stable picture, due to power surge.
You have an impending power supply failure.
I would not leave the set on and unattended. There are mulitple protective measures against bursting into flame but I trust none of them completely.
I just answered a few other complaints similar to yours and pasted some of my response below-
I'm afraid you are right suspecting the power supply; most modern sets use switching power supplies and they often fail when the source AC is screwy. It might not have been the low-normal-low-normal swings but an unseen, short term surge that killed it. The cycling is occurring to prevent a potential fire or more severe damage; a component has been whacked and the supply is detecting a fault condition, probably excessive current from some circuit. I'm afraid you are stuck with a repair, if it was mine, I'd look inside first but some basic instruments are needed and technical background.
I highly recommend to homeowners that they install a 'whole house" surge protector. Especially in lightning prone areas. With installation, around $200-300 US although an intelligent person can do it, it will require shutting down the home.
The surge protectors range from ~$110-200; most have a long warranty and many include insurance to cover items damaged despite the protection.
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A power surge due to lightening may have damaged the switching power supply. You will need to change the power supply module inside the TV. Normally, such power supplies have surge protection built-in, however, some surges are too powerful and could damage capacitors and crystals in the power supply module.
The tv power supply board it is dead 100% it is dead that board where the tv power a/c plug into it.Sometimes u get a burn or a chart coal marks if the power surge have big enough charges to the board,not it still kills board too because electromagnatic charges of the storm kills every electronic parts in came in contact with.Take the tv aparts.The tv power supply board are alway the one these two boards are the causes alway and the first board to dies .Replaced the tv power supply board first.Tv should work now,if not the main tv Tuner signal board it is also dead too.That the board where the incomming broadcasting signal wire plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement first and also the main tv Tuner signal board too,if necessary.70-80% changes the power supply board and necessary the main tv Tuner signal boad too tv should work again.20% sometimes the whole tv it fries and a total lost.
The screen flicker than go blank,does it still have power to the tv set?Yes,than this cause only can be causes by only 2 boards in the tv can causes this problems,if tv power still stable for the set.The T-CON board it shorting out and dying for this problems to happen or worst case causes the Main board tv Tuner signal board it dying.The T-CON board the priced it is cheaper and could cause this problems too.Tries change this T-CON board first,see what happen.This board T-CON board sit at the bottom in the middle of the LCD screen panel to decodes pictures pixel before it go onto the LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish T-CON board for the replacement.
tv problems are due to problems with the horizontal frequency and the horizontal width, spare part must be replaced is electrolit condensator (elco) in horizontal area. you can find written elco size: 1uf/160volt, or 4.7 / 1 160 Volt.and uf/50 Volt. it will cost about $ 10 - $ 20
Is it just the cable? Do you have a DVD player or game system connected? If so, how do they look? Ofter a momentary power loss can cause cableboxes to loss picture, loss sound, and even cause the picture to be distorted. Try unpluggind the AC power from the cablebox and TV. Wait about 5 minutes and reconnect both. Leave the cablebox alone for about another 5 minute after you reconnect it so that it can fully boot up. Then see if you still have the problem.
If you are hooked up to a HD source if the signal is too high will cause this to happen. Normally this will happen due to signal interuptions such as signal being low will cause freeze, too high will cause it to go out and cause the TV to show default blue.
Good luck to you.
I would suspect it has blown a fuse, more than likely on the Y-sustain board due to the power failure causing a surge. Possibly just replcing the fuse may rectify things but if it were to blow straight then the power failure has caused some component damage & would need to be investigated further by a repair engineer.
May I suggest something? Pls try another signal source other than the indoor antenna such as a DVD or even an old VCR.
It is possible that what you are experiencing is video muting due to dirty antenna signal. If even with a stable known to be good video source (DVD) the problem persist, then it is a matter of checking the voltages as indicated in your service manual.
Hope this be of some help/idea even if the chat did not work out. Pls post back how things turned up or should you need additional information.
The blue screen means that you have lost signal. If the set don't have signal for so long it turns itself off. "power saver feature" Check all connections or replace cables, If that don't work the signal board may be going bad.