Sounds like a piece of crap. I would take it back and demand a refund. If the manager of the store won't help you I would start breaking
things until I got what I wanted. If they still won't help you I would call Jessie Jackson (If your black), or seven on your side on ABC.
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When it shuts down go to the set and press the menu and the Device/Input button both in together and hold for 6 seconds then count the two digit blink code from the power indicator. it will blink a two digit code which repeats several times.
This is a power supply problem, I would suspect the HV power supply because the primary and secondary supplies anymore are tied to the HV power supply. This type of repair requires certain pieces of equipment, to test voltages, look at signals, and to if need be test for shorts in inductors (Switching PS transformer and Flyback transformer). I would not recommend that you try to fix this yourself, The cost for this type of problem is not that expensive and can be done in one evening, if the parts are available. You may be fortunate and it could be just a blown fuse, in the HV or LV power supply circuit