Upper 1/4 of picture is distorted by tightly spaced horizontal lines. What do you think is causing this?

Bad Panel most likely. T-con board failures do not produce Horizontal lines.

Not good. You may have a tab failure. A repair shop may be able to diagnose and repair this, but most likely the lcd panel is broken. The panel is the most expensive part of flat tv's. A new panel will cost more than a used tv.

When you say "distort the picture", are you referring to dark image? double picture

your picture tube may be malfunctioning -- all of the information for the screen is being squished into that horizontal line. If this is the case, you can buy a new picture tube and install it, but that would be the only fix. the only other thing I can think of that might cause this issue would be if you have a large speaker next to your TX. The magnet from a large speaker can distort the television, but it usually gives you a funny green distortion near the magnet without killing your whole screen so it seems unlikely that this is your problem.

At first the picture is ok, and then distorted with horizontal lines i thinks. If the horzontal lines are parellel acros the screen, with an inch apart across the whole screen, your tv needs screen adjustments. Screen voltage may be high. look into the crt base also. Change it first. These also not resolve the problem, LOT may be faulty, with respect to screen focus pack. May need replacement. Try first setting screen voltage to a lower settings and observe.

Hi, How are the lines positioned? are they equally spaced creating four equal sections or are they close to each other?

Jack

the video playback is sampled off the video out and independently processed sorta like a TV signal to project on the lcd screen.
horizontal lines means you lost sync circuit and needs troubleshooting. Hopefully maybe a bad connection with a ribbon cable for the ICs and components are hard to change and jammed tight. I would order a video board.

Unfortunately there isn't any way to repair your tv as the magnet has distorted the tube that is in the tv and with CRT becoming obsolete the repair is likely to be very costly so probably your chaepest option is to buy a new tv .

CCD fault.

This is due to vertical section failure. Change the vertical supply rectifier diode and supply filters. Then check zener diode leakage in pumpup circuit section. Also check any electrolytic capacitors leakage in vertical section. If it is old model tv change vertical height, vertical lenearity presets also. I hope given details useful to you.