Please check the connections on the back and hope that you find a loose video connector. If that doesn't fix it then continue onto the source to see if that might have a loose connector.
The next thing to check would be the other inputs using the TV/Video button to see if the video on all of the inputs is dead. That would be what might be called "bad news".
SOURCE: No picture on Sony TV
This unit is new enough for it to still be under warranty. Please call for warranty service.
Dan
SOURCE: sony bravia kdl 46s4100 no picture
it sounds like your back light might be going out. You might be able to fix this by installing a new backlight inverter board.
SOURCE: I have a Sony Bravia
just re solder the tuner board and the panel board if the screen is totally went black re solder the inverter board replace the back light if worn. if its not work just ask me. i hope it will help you good luck.
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