How do I fix dark lines across the top of my tv screen? It's a JVC lt37x688

SOURCE: line across top of screen

If the picture is ok otherwise then only thing that probably needs to be done is a vertical height adjustment. That is if the lines never changes position from cold to hot.

SOURCE: thin horizonal line in middle on dark 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.

SOURCE: thin white horizontal lines across top of TV

replace vertical out put ic and related capacitors
please refer to a qualified tv personal to check tv

SOURCE: TV: bright line across black screen for several hours.

vertical problem need to check for bad solder joints on vertical ic would be helpfull if we had the model number o f yur set. also could be bad capasistors in vertical section.

SOURCE: Horizontal lines across the top of the screen

Can anyone produce schematics and or pictures of the vertical hold capacitor. Something similar to this: http://www.thathomesite.com/forums/load/electronics/msg010215046854.html?12