Black line across the screen - Samsung SL600 Digital Camera

To clarify, are the 3 black lines horizontal (left to right across entire width of screen)? or are the 3 black lines vertical (top to bottom across entire height of screen)?

Horizontal lines are almost always the result of a failed panel, and no board replacement will fix the issue.

Vertical lines such as you have described (only 3) are probably also a bad panel. If the black lines were evenly spaced in a repeating pattern, it could be a mainboard or TCONN board.

Has this panel been cracked? or perhaps cleaned recently with too much water or cleaning solvent that has gotten the screen wet?

You may have to sell the TV for parts.

This is not the fault with remote control. It is with your TV itself. Contact any service technician.
Gopakumar Gopalan Google

Loss of vertical sweep or deflection.

if line is horizentle check vertical ic supply and out put capcitor if line is vertical check yoke wirsand cap 560k at horizentle yoke and any print brunt

buffer board/can be repaired or new buffer

It is problem of LCD Panel that will be replaced.
Please check with dealer / store for extended warranty option.

the vertical IC most likely has failed

Black lines across the screen generally means that the pixels on the screen itself have gone bad, or the contacts/processor chip has a broken connection. Either way, its an issue that requires repair.

Replace c7136 & c7154 on A board This should clear up your problem

A line on an LCD, either horizontal or vertical usually means the video driver board is defective or the screen is defective, does it show up as black even on a dark screen? That means a line of LCD "shutter"s is not working and there is a problem that cant be fixed by a reboot or channel change. Bummer.