Samsung LN40D550 Horizontal Lines except at bottom

[Louis82]

Hello,
This Samsung tv LN40D550 shows horizontal lines across the screen. The bottom part doesnt show any lines at all, it looks normal. I disconnected one of the ribbon cable from t-con to Flex pcb and the lines dissapear and the hald that remains connected looks good. Replaced T-con Board and still the same. I tried applying pressure with pads on flex pcb but no change.

Is the panel defective or what would it be your suggestion guys?
Let me know if better pictures are required.

Thank you

[tom66]

Re: Samsung LN40D550 Horizontal Lines except at bottom

If the half is otherwise working OK, I would suspect a problem on that board with a component loading down some clock signal. If you have a scope, you could try tracing it. Bear in mind, the D series Samsungs are terrible for panel faults, too many are failing because of it.

[Louis82]

Re: Samsung LN40D550 Horizontal Lines except at bottom

Thank you Tom66. What should i look for with the scope?

[tom66]

Re: Samsung LN40D550 Horizontal Lines except at bottom

What labels are there near those connectors? I see VGAMA but am more interested in things like CLK or RL0N, BR2P, etc.

[Louis82]

Re: Samsung LN40D550 Horizontal Lines except at bottom

I dont see anything like that. I see VCOM34, HAVDD