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These Mits TV's tend to have power supply problems that are well documented on the web, when the symptom is as you describe. And this assumes no other unusual noises were heard before the TV went into shutdown.
The repairs are fairly straight forward if you are comfortable with electro-mechanical dis-assembly, soldering repair, and re-assembly.
Just do a search on Mitsubishi (your model number) and capacitors.
I do not have the service manual but have instructions with pictures.
Will email them to you. If you have never soldered check look for
instructions on utube and with some practice you will be able to
de-solder and solder. A utube video that is great is at http://www.youtube.com/watch?v=I_NU2ruzyc4. Good luck.
I just fixed the capacitors on my WS-65713. I can email you instructions with pictures if you wish. You will need to de-solder and solder on new capacitors but if you check out video instructions on utube you should be okay with some practice.
I had the same problem and just fixed it. You likely have 4 bad capacitors in your DM board. To fix you will have to take the DM board out of the TV, de-solder the ones on there and then solder on new capacitors. For those who would like instructions on this leave me your email and I will email them to you. I can't believe I was able to do this but thanks to Jaime for giving me the instructions and checking how to solder on Utube. No I had never soldered before guess it shows you can do it with some effort.
This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the device 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. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times. 1 - 2 = no error detected 2 - 1 = X-ray protect (high voltage or beam current) 2 - 2 = Short protect (short protect monitors low voltage supplies) 2 - 3 = Deflection protect (this could be loss of vertical or horizontal deflection) 2 - 4 = Vertical protect (usually loss of vertical from the source)