Sounds like the shut off timer is set (or power cord loose). Heres the LG site that gives instructions on how to check settings: https://www.lg.com/ca_en/support/product-help/CT20098005-1412238468277-intermittent-power-or-powers-off-on
SOURCE: 42 inch LG Plasma TV - Lost picture
Our LG 50" plasma tv screen went black after a popping noise but still had sound, after great diliberations decided to take the back off and have a peek!
We unplugged the tv and tested the fuses (there were three we could see) one had blown, the one on the left as you look at the back of the tv it also has one above it. We wrote the code/seriel number down and took the fuse to the electrical wholesalers Maplin and bought a pack of 10 fuses for £1.29 replaced the fuse in the tv and everything now fine!!!!!!
Hope this might be of use to anyone whose lost the picture after a loud popping/snacking noise but still has sound.
SOURCE: LG 50 inch plasma has trouble powering up. have
Power supply board have dead capcitors.Know how to solders?These capacitors usally bulge or pop open,replaced these capacitors will solved this problem.Or tries websites Shopjimmy.com,Ebay.com to buy a Whole reburbish power supply board for the replacement.
SOURCE: Panasonic Plasma TV problem
the cost depend upon the itmes (dameged ic, on the mother board of your t.v,)which can only bw assessed after opeing it,,,
service charge will be approx. 300 buks,
and approximately the ic's will cost, about 1200 bucks
SOURCE: 60 inch LG Plasma, did
The tv before,the tv power supply board already have problems and was slowly dying,that why it require u to pushes 5 to 7 times for the tv power supply board to be able to sustance and hold power for the tv.Now the tv power supply board it is alot weaker or already dead.That why the tv dose not power on anymore.The tv power supply board that the board where the tv power a/c cord plug into it.Try website like Ebay.com to buy a whole new refurbish tv power supply board for the replacement.
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