Depending on the events leading up to what happend...
Was your plasma tv recently transported or moved from one area to another?
One thing about plasma tv's if you lay them horizontally or has been tilt at a certain angle they will have problems projecting any picture. PLASMA tv's should ALWAYS stay vertically standing. you can let it stand where it should be for atleast 24 hours ( i recommend upto 48 hours) without plugging it in.. (no electricity what so ever) then check if it works.
About the click you heard, it might have been a blown fuse. Probably resulting from plugging in the tv while it was in a "chemical inbalance". therefore my above recommendation is a bit too late. if you still have warranty then you have no problem. just the hassle.
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You need the ysus board. This is a very common problem with LG's. If it is coming up with the fuse removed you are essentially removing the short from the power supply so that it can come up and deliver other voltages for sound and all. Check out encompassparts.com if you are going to try to repair this yourself. Thanks
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.