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hold the menu and input/device buttons for 5 seconds and it will blink you a 2 digit code 1-2 normal operation 2-3 i believe is short circuit protection = probably a convergence failure here is a link to my tutorial http://www.fixya.com/support/r5001731-convergence_diagnosing_convergence Let me know if I can be of further assistance.
The convergence ICs have failed and thats what is shutting the set down. You will need to replace both convergence ICs they are STK394-250 you can get replacement ICs at the following link with free shipping and free instalation instructions with pictures s you can do the repair yourself. Here is the link. http://servicemanuals.vstore.ca/
You might have a bad power supply or convergence circuit, I also suggest you to check for fluid spill on the circuit board. if the convergence is defective one of the 5A picofues on the power supply is open. Hope this help you.