We have perfect sound but only a thin horizontal line in the middle of the screen.

it sounds like you have horizontal colapse a very complect repair try hitting the tv if the screen comes up full picture then its a dry joint if not there is an ic or power fault toss it

You have a thin horizontal line in the center of the TV. You, in this case have vertical IC that has bad grounds. Resolder the vertical IC pins and check the capacitors in the immediate area and replace these caps as necessary. If you still have a horizontal line, you will have to replace the vertical IC. Find a TV tech or someone with electronic experience to do this for you. Should be reasonable to fix. Thanks for asking and Good Luck!

No,Ur vertical/horizontal IC is shorted or cold soldiers.Could be the parts that support the IC is also.

main fluorescent tube and drive may be damaged...average life is 2000 - 4000 hours for these screens....check if parts are available...what happend prior to it going dead?

may be 300$ in parts before labor to fix...so may be time to get a new one...
\price value ratio is hard to justify

Your Vertical Amp is probably Blown (bad) , but before you change that check all capacitors around the vertical amp IC and / or resolder resistors and diodes around vertical amplifier.
And NO it is NOT the Picture Tube
Good Luck
JG

no you have no vertical bad chip ic

intermintence in vertical IC deflection its a job for experienced tech need to look for that circuit and do fine job resolding that IC

Is this a LCD TV? IF it is it could be something on the video processing board. Let me know the model # and well will go from there. Thank you Jay

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!

There is a bad solder connection in the vertical sweep circuit. if you know how toi solder, go and find the vertical output IC and resolder that first.. but if you have no solid state electronic repair experience, please find a trained tech to assist you in this repair, as if you wait it may end up costing you double of what it would now, so haveit done ASAP. Good Luck Please do not forget to rate this one.