Last night the set just turned off by itself. When I try to power on, the power light comes on for a second and then it shuts itself off again.

remove the ram from pc and again insert in the slot

Check the power circuit see if there is any capacitor problem..

Sometimes they just need to be reset
1 turn off power to switch (Circuit Breaker off)
2 wait 30 seconds
3 re - turn on power to switch again (Circuit Breaker on)
4 wait for lights to turn on by themselves ( about 15 seconds after power is turned back on)
should be OK after this remember to not enter the beam after power is turned on ...... (see #4 above) as this would make switch beam super sensitive. Hope this helps

Tries unplug,replug the tv back like an hour later.The tv,now it will resetting itself back to the factory setting.The tv should work now.Not,than the power supply board is dead.That the board,where the power a/c cord plug into it.Try website Ebay.com to buy a refurbish power supply board for the replacement.

When the power light comes on and then goes out, on the front of the set press both the MENU and INPUT buttons at the same time and hold them both in for at least 5 seconds and then release both buttons.

The power light will blink a 2 digit error code and repeat it at least 5 times.

The most common error will be 2 blinks, 2 blinks- a pause and then it will repeat it for a total of at least 5 times.

To get it to repeat this--you have to unplug the set, try to turn it on again and repeat the process.

The error codes are to try to narrow down where the problem is.
If this told you something you did not know rate this solution as very helpful as I do this here for free.

Let me know what error code is found and I will tell you what it means.

SD TECH

Replace your STK ICs- STK392-570s Mats has them 1-800-628-1118

GIVE IT A ******* REST ****** UR A NERD GAMER

i have the same problem

again a good set the deflection modules on these sets are pretty reasonable you need to have a tech swap it but i highly suggest that than a new one the chirping is the set trying to start up but going into shut down

ftry to unplug it and push the on/off switch...plug it back in and see if it will turn on