Possibly the led gave out they sell on ebay cheap. the way to know which to get is by model number and it si behind the tv
SOURCE: No picture
Try a hard restart, which simply means unplugging the power cord of the TV, and replugging it after 4 hours have passed. This technique reprograms the electronics, to a certain extent. If the picture does not return, then you have a more serious problem, that requires the attention of a TV repairman.
SOURCE: SAMSUNG PS42D4S PLASMA TV HAS
I had the same problem here but I notice that one of the compoent on the power supply board is melted slightly. Suspect that it might be the cause. the compoent have a symbol of transformer and is grey in color...(look like a cap) ...compoent number is L48
SOURCE: power led blinks but no picture or sound
Had the same problem myself. Took some doing but I managed to find a service bulletin that I downloaded. The problem is with the siene module and all you need to do is unplug connector JP63A from the main board and your TV will work again.
Take the back off the TV (there are a lot of screws) and look on the left hand side of the main circuit board that is mounted in the center of the TV. You will see a small white connector that is labelled JP63A, simply unplug it. Plug the TV back in and let it reboot. That's it, should be able to watch immediately.
SOURCE: no picture
It sounds like the backlight is out. If you can see a faint image that changes then this is the case. You either need to send in for repair or replace. It can if you are lucky be a connection. You can try removing the video cable and try another source or cable.
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