This problem can be caused by a bad main board. I have only seen it one other time though. If the unit is under warranty I would have the board replaced, If not, it is fairly expensive and you may want to live with the light. Hope this helps
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The capacitors on the power supply need to be replaced. When you take apart the TV, and then remove the power supply (it's the section that the power cord goes to) and open it up. Look for the little can capacitors and see if any of them are bulging on top. That is the sign that they've blown. Replace the big ones (about 5) for about $5 in parts. Reassemble and test by turning it on. Search for YouTube video on how to replace capacitors. Check for warranty service first if still under the mfr warranty or extended warranty.
Check that all cables are intact and plugged in correctly (VGA, DVI, Antenna etc.). Did you place batteries correctly in the remote?
There might only be one button for turning on and off the TV (usually the red one in the top off the remote).
Is this a new TV? If so, remember that it has a break-in period of about 100 hours or so. Not everyone believes in this, but in my experience it does have an effect.
Try reducing your contrast ratio to 35 (default is 50). You shouldn't see too much of a difference and it may solve your problem. And if it's a new TV, you could try setting it back to 50 again after the so-called 'break-in period'. Hope this helps.
I had a similar problem where my 61" Samsung DLP was turning itself off very frequently I had resolved to try replacing the bulb. I called a local TV repair place to see if they had my buld in stock. The guy I spoke to actually told me how to fix my problem! There is a little blue switch behind the bulb access door. The inside of the door has a little piece that presses the switch down. The switch is supposed to work correctly weather the switch is in the up or down position but samsung forgot to take expansion from heat into account. If the switch is held in the upper position by the door and the plastic expands to a certain point, it triggers the set to shut off. This does not occur of the switch is held in the lower position. What you need to do is take the access door off and put it back on by sliding it into position from above. That will hold the switch in the down position, eliminating the problem. My set has not **** itself off ever since.