The back light driver is bad. You could have lost the voltage from the power supply board to the led driver too. If you have a volt meter measure all the voltages on the power supply. The correct voltages are printed on the board next to the connector that goes to the rest of the TV. If they are all correct then the backlight driver is bad. You can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy
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: Sound but no image on my LG Plasma TV
Hi there, Im Kanth, i had the same problem, and i found a person in Mississauga, they fix all kind of problems in Plasma, they fixed my LG before a 7 months, its still running good, i came to know lots of ppls were having same problems, i sujest u to being the plasma to electronics @ Dixie and Britannia Mississauga, call them now 905 565 6595 or check there wesite for more info. http://dukeelectronic.com
SOURCE: LG LCD TV startup sound
To disable the sound go into the menu, then options, then power indicator.
In there you can disable the startup sound and also the power indicator light too.
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