That model has a blink code to help diagnosis. When the TV goes off press The Input And Menu Buttons On The Front Panel Simultaneously And Hold Them In For 5 Seconds After 5 Seconds The Power Led On The Front Panel Will Blink A Two Digit Sequence. It will help determine the circuit but troubleshooting will be needed to check for a defective component.
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probably not worth it. How many times does the LED flash? That will indicate your failure cause. Problem is this is an old tv and parts are not available or cost effective. Unless its bad capacitors or bad solder you could be looking at rediculous amounts to fix it. Mitsubishi WS 65413 Manuals Support and Troubleshooting TVs
here is a link to the manual. please provide the amount of LED blinks. itll blink a few times and pause.
Mitsubishi has problems with the thermal sensor going bad. They extended the warranty for several sets. The sensor is right by the lamp. Call mitsubishi and insist they do something for you. If you keep playing your set, the bulb could also be at risk. I would think your set is covered being a 62" set. Good-luck and be sure to act ASAP.
Sounds like you have a bad green picture tube that has failed. To check this out; remove front speaker grill, remove small panel, you will see three CRT's (pictue tubes) sticking down, remove the little board on the middle tube then restore power. If TV stays on more then likely the CRT is bad but not always the driver on board could also be bad, check voltages.
I gave this advice to someone with this same problem so here it is again:
It sounds like your shutdown circuit is being activated. This is due to excess current being drawn. This usually happens in the High Voltage section of the TV or one of the deflection stages. Due to the nature of this problem I would suggest that you take it to a local TV repair shop or have a TV repair person come out and take a look at the issue. The HV section is dangerous and should be dealt with by a qualified TV repair technician.
Bad convergence IC possible - It's cheap if you do it your self, expensive if you take it to a repair shop. My Toshiba finally came on and stayed on after the IC's burned completely up and smoke poured out the back. Then mine stayed on with a distorted image. A good place for parts -> http://www.electronix.com/catalog/default.php/cPath/6