SOURCE: tv problem
Your problem is in HOT, Horizontal output transistor is defected already ,this is high voltage transistor , if no high voltage there no picture ,but supply is there because light is flashing ,the supply voltage is trap ,when this voltage go to horizontal section your tv is automatically shut off because defected HOT,,you change this transistor ,so performance will better again ..find a tv repairman to do the works in changing the transistor and little reheating works.
This is better in order to avoid high voltage shock,this not cost much....
SOURCE: Westinghouse 1080P 42" LCD TV - HDMI stopped working
Just reset the TV found out how here: http://www.danielcoburn.com/uncategorized/westinghouse-1080p-42-lcd-tv-hdmi-stopped-working-fix/
Hold the power button for 10 seconds.
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