Question about LG 52LG60 52 in. HDTV LCD TV

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My TV a LG 52LG60 52 in. "Scarlet" HDTV LCD TV "loops" when powering up. It will light the power button, begin the startup sequence, and then power back down, and back up again, never attempting to light the screen or any other component, not making a sound, just stuck in the loop. It also will not shut off with the power switch after the loop has started. I physically have to take power off the TV (unplug it) and it will do the same thing again, only initiated with the power switch - it will not be in the loop until I touch the power switch when plugging it back in. This happened out of the blue one day - TV was on, and I was on the PC, and then I noticed the sound and picture disappeared, and it being stuck in this loop and began trying to figure out what the heck happened. It had been on for a few hours then boom, it just powered off and went in this weird loop. Any ideas?? Thanks in advance.

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This is a classic switchmode power supply, shutting down to avoid a fire, explosion, or both. This set had developed a problem, that is so severe that the set must be shut down, So the power supply tries to do this, however when it does, the fault, is temporarily removed, (Usually because the faulty component cools down) and then, it restarts up again, senses the fault, and shuts down, and then... and so on...
We call this a "Hicupping Power supply" This set should be removed from the Power, and in my professional recommendation, you should get a "Quote" for repair, from, an, Approved Service Center, this point is very important for a good result, Always contact, their local, "Head Office" Now, when you get the information you want, then you can decide as to repair of replacement. The reason we want an approved agent, is that way, all the engineers are trained on their own brand sets, they have seen almost all faults, and will get the job done quicker, and for less cost, and usually have parts on hand, also sometimes, there has been a service bulletin in issued and the repair may be subsided or even free.
Please find below FYI a Training manuals, this is what I use to teach the technicians to troubleshoot and understand just how it all works and what to do,and how complex and difficult, these units are to service.

Posted on Aug 21, 2010


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