What is the problem My samsung LCD TV picture went out and displays a grayish white background?

SOURCE: Digital Tv is stuck on a channel

I have found the solution at last :)
Put the TV in standby and press these buttons in order
Info, Menu, Mute and Power on.
You will then see a hidden menu, on line 12 select reset
Bingo :)

SOURCE: Samsung LE40R51B no picture but turns on

i have the same problem i was told by a repairman that samsungs are known for bad psu. and that its expensive to repair

SOURCE: no picture on samsung lcd tv

I have the same problem. I brought a Samsung 46" in July 07 and on Jan 8, 2008, video went blue.

I called Samsung and sent out technician and they replaced the motherboard.

Two hours later, same problem occured. I called today and Electronic Company thinks I have a bad LCD panel.

SOURCE: HDMI INPUT FOR NON HIGH DEF CHANNELS WILL NOT DISPLAY FULL SCREEN

if you have a cable box then it is probably the resolution settings in the cable box, what type of cable box do you have

SOURCE: sound yes, but no picture on tv

If you have sound on the stations this is a problem in the display. Take bright flashlight and hold it against the screen. Look for an image around the edge of the flashlight. If you see an image then it's one of three problems;
1) The inverter board is bad.
2) The CCFT (cold cathode fluoresent light) are bad.
3) The power supply to the inverter board is bad.
Someone knowledgeable in electronics can replace the bad part(s).