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TV shows only a thin horizontal light whenever i turn it on

Please Help!!!
My TV screen remains like it is still switched off whenever I switch it on, with the exception of a bright horizontal light across the middle of the screen.
It started about a week ago. it wasn't that serious at first. once in a while the picture would shrink a bit towards the center( making the picture look wide) and become darker. Picture would also become a bit shaky. It usually returned to normal after a while or when I hit the TV.

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Since hitting the set "fixed" it initially, the problem may have been poor connections. At this point it is likely that the vertical IC is now defective. Since you have not posted a make and model, I can not give you specific details, but look for a small flat IC attached to a heat sink with about 11 pins. Try resoldering the pins first. If that fails replace the IC. It should be marked LA7837 or something similar. Feel free to post the marking here and I'll confirm you have the correct part.

Keep us posted.
Dan

Posted on Nov 17, 2008

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There seems to be a problem with the vertical deflection ic or deflection yoke . try resoldering the vertical ic joints look for other loose solder joints around the vertical area on the circuitboard

Posted on Nov 17, 2008

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