Question about LG 50PC5DC 50 in. Plasma HDTV
The tv turns on and then shuts off after a minute or so. I can turn it back on but it keeps shutting off. I did take the back off and look at all the capacitors and none are blow on top.
Check the solder side of the pc board. If there are any connections that look grey (as opposed to shiny) you need to re-solder them.
Posted on Dec 12, 2014
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Posted on Jan 02, 2017
Your Television uses a sensing circuit that is basically part of a mini-computer. Sometimes either the sensing unit can be bad itself or there is a power distribution issue.
Test - Make sure you try another input source like DVD or something other than what you are trying now. If it plays and does not shut off, the TV might be ok, it might be something to do with your other source you were using when it went out, like your cable box etc.
(most LG's have input sensing and if there is nothing coming in the TV it will shut down or go into standby)
If you have run this test my friend, you may have no choice but to take it in or have a service call. A LG specialist might bring the board you need in to repair it but that can be rare. Most of the service guys that come out are following instructions in a systematic troubleshooting guide and do not really know how to troubleshoot per say, they are card replacers until it works.
They cannot fix the problem in the home if you cannot repeat the problem in front of them and it is consistent.
You may want to call LG or Write their tech dept (good luck, they kind of are not that customer service oriented that I have seen).
I always recommend the extended warranty on a high-ticket item next time.
Hope that hepls and let me know how it goes.
Posted on Mar 02, 2009
SOURCE: My LG 42"tv shuts off by it self
The best way to fix this is by opening the back cover of the television set.
The power light may be flashing or if you are runing with a series light bulb it may be cycling on and off continuously. There may be a chirping or clicking sound from inside the set. (Note: using too small a series light bulb load during testing for the size of the TV may also result in this condition.)
If there is a low voltage regulator or separate switching supply, it could be cycling on and off if the horizontal output, flyback, or one of its secondary loads were defective.
Does this TV have a separate low voltage regulator and/or switching power supply or is it all part of the flyback circuit? For the following, I assume it is all in one (most common).
Some simple things to try first:
Verify that the main filter capacitor is doing its job. Excessive ripple on the rectified line voltage bus can cause various forms of shutdown behavior. An easy test is to jumper across the capacitor with one of at least equal voltage rating and similar capacitance (make connections with power off!).
Use a Variac, if possible, to bring up the input voltage slowly and see if the TV works at any point without shutting down. If it does, this could be an indication of X-ray protection circuit kicking in, though this will usually latch and keep the set shut off if excessive HV were detected.
Posted on May 20, 2010
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