The tv will shut itself down (but the red light stays on) after a while. Sometimes it takes longer than others. It will not come back on until you turn it off and wait a while. If I just leave the tv on after it shuts down, the red light will begin to blink.
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Your unit has some sort
of PSU fault, or a problem that is shutting down the Power Supply
Unit, PSU. This happens so that no further damage, and possible fire will
occur. The sound is it starting up, shutting down, over and over. You need to take the unit to a reputable service
centre/man and ask for a firm "Quote" for the work to be done.
These Hitachi models are a bear but this may be the fix: Regulator STRM 6511 and C915. A good tv repairman should know this. This should be changed first before determining that the high voltage transformer is bad which is likely to be the worse case senario and may not be available anymore.
You can download a PDF from here:
Make sure that the coolant is not leaking out onto the printed circuit boards. i have had the remote sensor cause this problem before and also I have had bad capacitors in the sweep and the main power supplies. Good Luck