Question about LG 42LC7D-UB Television

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My LG 42LC7D, when I turn it on, Blinks twice,then turns off

When the TV is turned on, I can see the picture, then it blinks twice, then turns off

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Sounds like it started "Protection Mode" because of a failed electronic part inside the TV. When this happens, the TV will keep turning itself OFF or will not turn ON at all. This keeps the other part inside from being damaged. Most likely the TV has a power supply related problem. It's possible that it maybe a bad capacitor or transformer on the power supply board. The common part to go bad for flat panel screens circuit board that powers the screen. Most manufactures call it a Backlight Inverter Board.
But, I can't say it's 100% the problem because I can't actually look at the tv over the internet. I can only make guesses with the symptoms.

You have a few choices:

1. You can again try leaving the TV unplugged for 30 - 45 minutes so the TV can discharge and reset itself.
2. If by chance the TV is still under warranty, go that route.

3. If you have some electronic experience, if you can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, schematics, test points, and part# lists.Usually, cost under $20. And most cases the new part cost less than $15 by searching on the internet with the part number.

4. Pay a TV shop to do the repairs. It maybe costly, but get an estimate of how much they will charge. That way you can decide if it worth repairing or replacing the whole TV.


I hope I shed some light on the subject for you.

Posted on Jul 20, 2009

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Possible capacitor issue. This model is known for the power supply capacitors to go bad prematurely ( it happened to my TV - the same exact model ). There's a sellers on Ebay that sell a kit containing new capacitors and explains how to re-solder the the new ones to the board. Mine is working fine now 5 years later. Go to Ebay and put your television model # in and type "repair".

Posted on Sep 02, 2014

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Posted on Jan 02, 2017

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