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If the line is all that is showing with black on the top and bottom. This indicates a loss of vertical deflection which is caused by the loss of the veritcal sweepignal. Check the output of the vertical section of the TV set. You will need an oscilloscope, and multimeter along with a schematic.
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what this sounds like is that you may have a cable in the wrong part of the tv like maybe a vcr or audio cable check your inputs in the back of your tv that sounds like it what it might be i have a big screen tv and if i have a cable in the wrong part it will hiss and have lines on it too i hope this can help if not reply to me at Jonk3y @aol.com
Definitely not. You have the symptom called 'field collapse' . What happens is a beam of excited electrons is traced across the screen and when it reaches the end the beam flys back and traces the next line down. Because you have a line across then the beam is scanning across but the field circuit isnt making the beam move down as it traces across a new line. The fault lies either in your field deflection driver chip or...the power supplying it has disappeared at around 27 volts..or the booster or voltage doubler circuit connected to the chip has goe faulty.. Another fault could be the yoke connection b roken but hardly likely unless youve dropped the tv at some point :)
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