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makes a difference where this line is... very top, top, middle, bottom, very bottom? also, is this set new to you, or has it been fine for a while, and just started doing this? does the line stay there when you switch to other inputs? (like a dvd player or a gaming console)? this kinda stuff will help you get an answer that makes sense - good luck
Several lines acroos the screen at the top along with picture is a typical fault. You are seeing vertical retrace lines. Either the supply smoothing capacitor to the power supply given to vertical output Ic or vertical output capacitor connected to the vertical output pin of that Ic may faulty. Usually the supply smoothing capacitor seen faulty. It may be over 1500Mfd eletrolytic capacitor used there. It may get value reduced by 40 percent or so, this falult will occur. Please replace the two capacitors together and will get the result.
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 :)
The main cause of this problem is cracked solder joints on the vertical output IC.
Re-flowing the solder should take care of it. Sometimes a capacitor (normally against the heat sink containing the vertical output) will cause this, but, it usually has a different symptom.
The price of repair will normally run, depending on where you live, $100.00 to $130.00. It's a small job and is done quickly.
Hope this helps.