I will not laugh at you, you have to understand...no one knows about these types of defects untill the TV's have been around awhile and start acting up...So don't feel bad, there is no way to tell when they are new.(We just hope RCA starts making better TV's :)
This model is very well known...now anyway, for their coolant leakage shorting out components as well as component failure on there power supply and front panel circuit boards. The blinking light and shutdown tells me that the TV is detecting the short and placing itself into a protection mode to prevent further damage as well as consumer safety. There are no particular self diagnostic pattern with this model. This will unfortunately be something that will need repair and testing to determine which fault is causing your particular shutdown. On the brighter side...If it is only the capacitors on your power supply or front panel board this will not be that expensive of a repair...There is of course the chance you have leaked coolant and you have shorted components that need replacing. On this TV there is no way to tell the exact component failure without looking at it and testing the television as there are so many different possible issues.
I hope this helps. Please let me know if you need further information...Good luck. Please click the green ACCEPT icon if you feel I have given a complete answer, and you can leave positive feedback. Positive feedback and bonuses are always greatly appreciated!
Thank You,
Phil

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