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TURN IT OFF AND DO NOT TRY TO USE---if a thin line left to right in middle of screen it is vertical problem---the set should shut down but even seconds count here--this can burn a mark on all three picture tubes instantly and it is permanent.
Problem if small line left to right in vertical circuit.
Let me know what you know and I will try to help--I know these sets very well.
I believe it is either interference or a convergence issue. To fix an issue with convergence try to find a convergence setting in the menu. If thatr doesn't work try to clean your projection lenses with a q-tip and alcohol.
that white line is a high voltage leak have you had this set serviced lately? one of the hv lines from the flyback transformer
is not seated or leaking you need a tech to find it not a safety issue just an anoyance
Middle going across the screen from left to right??
This unit is plagued with bad solder connections in the comb filter board and flatpack underneath the comb filter board. These connections can cause any odd number of problems in video display. If it is that it's not expensive - virtually no parts. If it's a single line across the screen could also be the vertical circuit involved.
My suggestion is to have it estimated at a reputable shop and take it to them rather than the more expensive pu/del charges.
If you would like go to http://www.nesda.com/locator/state_search.php and locate a servicer from there. Kinda like going to the AMA to find a doctor...
Hope this helps!
Could be a loose connection on the printed circuit board in the Vertical deflection circuit.
You would have to have a qualified technician to repair this problem.
A intermittent connection in the circuit described can cause a horizonal line across the screen.
You have to be careful and not leave the TV on for a period of time with a bright line, as it can actually burn a line on the CRT screens, which is permanent.