I have the same problem.

Horizontal thin bright line across the screen, denotes the vertical sweep failure. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy.
http://electronicshelponline.blogspot.com/

Unplug it,then wait 10 minutes,then plug it back in.

Sounds like a panel defect. Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. It will make search easy. There are more than 1000 posts to different brand TVs now. Pull up older posts there.

Make sure first that the picture is centered by using the remote control to move the picture vertically and horizontally. Use the round pad towards the center of the remote and push the button according to which direction you want the frame to move.

The single horizontal line is a problem with the vertical circuit. Look for a small flat id attached to a heatsink that should be marked LA7837 or something similar. Try resoldering the pins of this IC first. If that does not resolve it, replace the IC.

Keep us posted.

Dan

Picture is reduced to a straight horizontal line across the center of the screen.

Failure in the vertical deflection amplifier section. This is usualy from failed components, and sometimes cold solder connections. Most of the time, I found bad capacitors, and sometimes the output IC or transistors (depending on the model type) that have failed.

Take the set to a service center for an estimate. You may find it more feasible to buy a new set depending on the parts that failed and the time involved to do the work.

Jerry G.

its the ram
mine does the same took ram out replace

this ic is soldered onto the board with a heat sink it is related to horizontal circuit.your problem could also be the flyback.good luck