Samsung LN-T4061F service manual needed- no picture

[kannan_s]

Hi
My Samsung TV after Bad cap replacement - no picture only Sound. Now the TV switches on with allowing inputs but no Picture. If somebody can send me a PDF of Schematics or service manual it will help identify what the issue is
thanks
kannan

[tom66]

Re: Samsung LN-T4061F service manual needed- no picture

Backlight is lit?
Replace the fuse on the T-con board. Common failure.

[kannan_s]

Re: Samsung LN-T4061F service manual needed- no picture

Hi Tom
I have to explain this a bit more - when I replaced two caps which got bulged, the picture used to come on and stay for about 10-14 min and go off. Now the picture does not show up - I do see two fuses on the PS board and they are OK. I assume the T-Con board is on top connected by a cable from Main board right of the PS baord. I do not see any fuse as the board is full of SMD parts - so where is the fuse for T-CON ?
kannan

[budm]

Re: Samsung LN-T4061F service manual needed- no picture

The picture of the T-CON is not in focus, please take good clear pictures. Check the DC voltage at the test point V12V (on the right of the T-CON connector) to see if you do 12vdc.

[kannan_s]

Re: Samsung LN-T4061F service manual needed- no picture

Hi
I have 13.2 V at this point - I can take a clear picture and post if necessary ?
However - the backlight seem to go out within few seconds when switched on ? how do I check the backlight inverter is not switched off due to some transformer getting overloaded as mentioned on some posts ?

[kannan_s]

Re: Samsung LN-T4061F service manual needed- no picture

Tcon better pic

[tom66]

Re: Samsung LN-T4061F service manual needed- no picture

There's a device FP1 near CP1 and the main connector. Check if this is shorted (it should be.)

[kannan_s]

Re: Samsung LN-T4061F service manual needed- no picture

Hi Tom
I was checking the Backlight inverter - seem some connection problem? It was going out in few seconds after starting. Now after I trying to check as I suspected that could be the problem - conectors were removed for replacing the caps. Now I see the lights are on - so placed the cover and got it back on the stand without back cover - it is working fine for past hour. Looks to me that the connctor between Inverter and the power supply could be the issue as - TCON voltage seem alright and with the cover at the back off I can see these lights on through few holes on the frame
let me see how far this works as it was working even with the bad caps
kannan

[tom66]

Re: Samsung LN-T4061F service manual needed- no picture

OK, it was not clear if the LCD was lit up and had no image or was not lit up at all. You have probably fixed it. Enjoy.