ben_13, sounds like a main power supply regulation problem. You can go here and get a service manual. This could also certainly be the main board causing this problem also. If you do not know how to trouble shoot solid state printed circuit boards, seek out a trained tech to assist you in this repair. Good Luck, and please keep us informed of this repair.
Check all caps in the sup, also resolder everthing from the flyback to the vertical output.
Siva whats an sup? And sorry, but there is no flyback in this TV set.
ben_13, sounds like a main power supply regulation problem. You can go here and get a service manual. This could also certainly be the main board causing this problem also. If you do not know how to trouble shoot solid state printed circuit boards, seek out a trained tech to assist you in this repair. Good Luck, and please keep us informed of this repair.