I have a LG 42PC3RV Plasma TV since 2006 ..... I heard a kind of "crack" and after that I can hear the voice only but can not see picture at all. The led light on front boarder ( red and white lights) are working well. Please help me to fix it.

SOURCE: 42 inch LG Plasma TV - Lost picture

sounds like it may be a software upgrade

SOURCE: 42 inch LG Plasma TV - Lost picture

ysus pcb that supplies voltage to the panel is faulty

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 tv will not turn on, red light

i think your bulb is shot must be replaced

SOURCE: LG 42 plasma power problem

needs power supply Part number 6709900023A
it is a 171 dollar part, you should be able to order through LG,