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If the screen backlight is not on, first try adjusting the brightness.
Press TV/AV button on remote to select TV mode.
Press the MENU button on the remote.
Using the arrow keys (navigation buttons), choose picture mode and adjust the brightness and contrast.
If your TV screen is still not lighting up in a dim room, then the backlight is broken.
You have 90 days labor and 1 year parts from date of purchase.
go to the website of your tv and see if they have a troubleshooting for this. make sure also, that you do not have the brightness down to 0 and the contrast down to 0 this would give you a blank screen especially on larger screen tv's. also check the color tool
if this is a portable tv or an older one your state might have gone to digital programming therefore you can only get canada stations only. but try your brightness/contrast controls and make sure they are not low.