Question about Televison & Video
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Posted on Jan 02, 2017
I have a similar problem on my CRT computer monitor (AcerView 76c). It is an old screen and I think it is just at the end of its life, much like your TV. Having some background in physics, I would be pretty sure that the problem is with the cathode ray tube's vertical deflection system. The horizontal deflection electrodes are working while the vertical one is not. This results in a display of a single horizontal line (or in my case, a few superimposed) in the centre of the screen. Where both X and Y (horizontal and vertical) deflectors fail then the electron gun firing would result in a single bright spot in the dead-centre of the screen.
So really, we have no choice but to move on and buy a new set as repair is probably just as, if not more, expensive than replacement with a new device. Seeing as your post was in 2007, I hope you managed to solve the problem.
SZ (Sydney, AUS)
Posted on Oct 05, 2008
SOURCE: LG CRT TV Problem
It sounds like your picture tube is either shorted at the blue gun or there is a blue drive problem. The blue driver transistor can short and cause the same problem. If it has little fine white lines as well, most likely it is the tube. Thanks for using fixya.
Posted on Nov 11, 2009
Check its main power regulator section circuits for any defective components. If you are not well experienced, it will be dangerous to touch these part of the circuit.
Posted on Nov 23, 2012
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