I have a 40" samsung

SOURCE: Vertical lines in LCD tv screen

Need to check the two things.

1st -- need to exchange T-con Board.
2nd -- need to exchange the cables between T-con & LCD panel or
between T-con & Main(LVDS cable)

SOURCE: When I turned the tv on only vertical lines appeared

I talked to a Samsung support helpline and it needs to be taken to a service center for repair.

SOURCE: samsung lns4095dx/xaa after 30min the screen goes

The first place to start is with the Main bd. The second cause would be the T-con bd. Have a trained Samsung tech troubleshoot to find out and repair the set.

SOURCE: HI, I have a 40"

lcd panel is deffective..

SOURCE: My my samsung LNT4061FX/XAA turn on but no

If you shine a flashlight onto the screen, can you see a very faint picture. If yes, then your lcd panel is not lighting up. Replace the inverters or the panel.

first I would check the power supply for faulty caps, replace if neccessary.