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The fact that the television stays on for hours and other times turns in five minutes shows that your problem is intermitent .A defective component in the power supply is probaly causing the B plus voltage to go up.The TV can also have a dry joint which looks more likley i am curtain if you gave the TV a firm tap to the side when it come off it would come on back. Try it .
Your set needs demagnatizing if it hasn't been dropped. Only a tv repairman has a demgnatizing coil. However one try: unplug it and turn it back on because all standard tv's have an automatic demagnatizing coil circuit around the tube inside. but doesn't always demagnatize completely.
Solder any / all bad connections in power regulator circuits,
good visual inspect for over-heated areas caused bad small
defective electrolytic caps...Use ESR meter to check,esp.
Horiz driver xformer area............................T.