timfelix :
I have a sharp 52 inch with the power light flashing two short blinks following two long blinks
Unplug the TV for 1 1/2 minutes and that will do a hard reset.
Go to Google and with your model and information type in a search Sharp 52 inch model etc blinks 2 short blinks and 2 long blinks what is wrong
Something like that.
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Bruce G.