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The knocking sound is the high voltage trying to fire. That would tell me that the high voltage splitter has failed or one of the 3 picture tubes (not lamps) has failed. Most likely too expensive to repair a TV that old.
Power doesn't have to be knocked out for a cable box to destroy the HDMI ports on a TV. Thunder miles away will put voltage spikes on the cable system which in turn trashes the main board in the TV. You can get parts for your TV here: TV Parts Universal TV Stands DLP Chips ShopJimmy
There are a lot of different possible issues that may cause this most likely the TV is on the wrong station. Try tuning it to 60 or 73 if this doesn't resolve the issue just reply!
mi tv turns on but only in color blue,next tv turn off red light apear one time and second time flash twice,whit mi remote control power on tv turs on ,then whit mi remote control send change chanes or any other funcion the tv turns off,letme now if you solve yor problem ,and i apreciate if you have some tips for me,thank.
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