Samsung LNS3241D - No picture, sound and backlight OK

[Kristofor]

Re: Samsung LNS3241D - No picture, sound and backlight OK

Thank You Bill.

I did not know how to isolate the problem between the main board and Tcon. Is there a preferred place to purchase the Tcon board? Any places i should stay away from? Should i get the cable too?

If it makes a difference, I did measure a few voltages on the LVDS connector on the main board side (ones that i could get to). All measured referenced to frame ground, VDC:

AO1; 1.159
A1-; 1.186
GND; 0
A2+; 1.235
CLK-; 1.156
GND; 0
A3+; 1.167
NC; 0
NC; 0
GND; 0
PANEL_V; 5.36
PANEL_V; 5.36
PANEL_V; 5.36

Thanks again.

[tom66]

Re: Samsung LNS3241D - No picture, sound and backlight OK

Fixed Samsung T-cons before, the fuse often blows, but the board is cheap anyway. You problem doesn't really sound like a fuse though.

[PlainBill]

Re: Samsung LNS3241D - No picture, sound and backlight OK

Four year old LCD TV first started showing problems with intermittent vertical lines across the entire screen; of varying number, width, and color. Now it turns on and stays on, but there is no picture, not even for a second; does not matter what source. Even the menu items do not display. The audio is fine and the backlight is on.

I replaced a bulging 470uF, 25V cap.
24VDC checked going to the inverter board.
5.4, 12, and 13VDC look good going to the main board.
LVDS cable and end connections appear okay. Contacts cleaned.
Fuse F1 on the Tcon board is good.

Is there any thing else, fairly easy to check, to narrow down the problem? I do have access to an O-scope from work, but do not have a lot of money to throw around. Any help would be greatly appreciated.

The symptoms indicate a bad tcon. The intermittent vertical lines across the full screen indicate it's not a bad panel.

PlainBill

[Kristofor]

Four year old LCD TV first started showing problems with intermittent vertical lines across the entire screen; of varying number, width, and color. Now it turns on and stays on, but there is no picture, not even for a second; does not matter what source. Even the menu items do not display. The audio is fine and the backlight is on.

I replaced a bulging 470uF, 25V cap.
24VDC checked going to the inverter board.
5.4, 12, and 13VDC look good going to the main board.
LVDS cable and end connections appear okay. Contacts cleaned.
Fuse F1 on the Tcon board is good.

Is there any thing else, fairly easy to check, to narrow down the problem? I do have access to an O-scope from work, but do not have a lot of money to throw around. Any help would be greatly appreciated.