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Re: line across the screen
Dry joints on the field output ic is a fairly common problem with these.if a firm slap changes things,a simple resoldering job does the trick.resoldering is usually the cure ir the fault was intermittent.otherwise the ic may need to be replaced.cheap as chips,so to speak.hope this helps,steve.
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This problem is caused by the loss of vertical deflection. Either the vertical output section of your TV or the vertical coupling capacitor has completely failed. In any event you will have to have a TV technician fix this set, BTW I hope you have not been playing the TV with the line on the screen this will burn the TV screen.
The several thin white lines at the top of the screen is the warning that the vertical output IC is not getting the boost voltage it needs to run correctly. The IC cannot operate for long like that and shorts out inside, which is when the vertical collapses altogether and you get the thin white line through the center of the screen. The good news for your son is that he had nothing to do with that, and it has nothing to do with the cable F connector. The set needs to be serviced by an experienced tech who will restore the boost supply and replace the vertical output IC, and when I do that I charge $75 but techs in your area will vary, so be sure to ask around.
this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!