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Your Tv being led gets it's light source from it's led's, are you able to tell that these are on ? Or is the screen completely dark ? If the Led's are not turning on the driver more likely needs replacing. This is what powers the led's.
The link below will take you to a page where you will see a picture of the driver. The website you will be on is a very good source for manuals schematics and troubleshooting information. I think it will be very informative and helpful to you. I believe finding out whether the actual led's are working still is crucial. Using the procedure appleads mentions sounds like a good idea. If the leds do work then more likely they are not getting power from the driver. If you have a black screen but the led's do come on then more likely the DMD board will need replacing.