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Main power supply regulator board fault. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. http://electronicshelponline.blogspot.com/ Pull up older posts there.
there are some boards in the tv that plug in (push down) have the power off and unplugged have a look around, and see if any boards have come loose, stay away from any thick red wires (EHT) DO NOT PULL At the Gray Rubber Caps that go to each gun (tube) RED GREEN Blue, this can carry a heavey charge even if the tv is off and has been for days, regards mark
am toshiba authorized servicer-have same model in shop for same problem-dvd board is defective-new board is about 290 from toshiba america parts-tv is actually made by orion with toshiba name stuck on outside-orion is junk-cost more than new set to fix-junk it and buy a panasonic-so far they still make their oun stuff
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.