Was watching TV it shut off. I cannot get it back on. Cable is

If backlights are working issue is probably with t con board since you have audio,

did you hear the sounds? or maybe you have defective power source in hot side..

You need to turn on the cable box again. Make sure to select the right source again for your tv.

Check and replace the back-light inverter baord.

Check its backlight inverter board.

The tv have a long board call a LCD inverter board.This LCD long inverter board,it dead.This long LCD inverter board,help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish long LCD inverter board for the replacement.

Does it only happen when you use your Xbox?

Try pulling the cable in and out between the TV and Xbox

power in the tv has nothing related with the DVD. The tv has to have raster (white screen) even without signal (cable, DVD, others) if the tv alone is just having the led flashing and neither sound nor video (black screen) The tv has a short circuit in some of the boards that are part of the tv system. the blinking is part of a protection when the tv was created in the factory. Refer to the technician to repair this problem.

sounds like the sat receiver not the tv.