Un50j5200afxza

[fcisolutions]

I have a Samsung UN50J5200AFXZA television. Initially screen was flashing on and off but nothing on screen, just light from the backlights. Power supply was putting out correct voltages, 12.2V when on. Replaced main board and getting lines on screen. Unhooked one side of T-con and getting good picture on one side of panel. When swapping side that are unhooked getting faint light spot. When both ribbons are hooked up still nothing on screen.

[budm]

Re: Un50j5200afxza

I have a Samsung UN50J5200AFXZA television. Initially screen was flashing on and off but nothing on screen, just light from the backlights. Power supply was putting out correct voltages, 12.2V when on. Replaced main board and getting lines on screen. Unhooked one side of T-con and getting good picture on one side of panel. When swapping side that are unhooked getting faint light spot. When both ribbons are hooked up still nothing on screen.

Checking the caps for shorts/bad leakage resistance, etc ON the bad side of the tab boding board will be the next thing to do.

[fcisolutions]

Re: Un50j5200afxza

Do you mean tab bonding board on the panel.

[budm]

Re: Un50j5200afxza

Yes.

[fcisolutions]

Re: Un50j5200afxza

So do you think being one side of the panel may be bad, do you think that pulling the tabs on the one side might work. I have been reading about it in the forums. What do you think?

[budm]

Re: Un50j5200afxza

There may be short circuit on one side, I.E. shorted/resistance leakage of the cap or shorted TFT driver IC's.
Easiest thing to do is to check the resistance between the two legs of each SMD caps on the tab bonding board first.
" do you think that pulling the tabs on the one side might work" they are not pulling from the tab bonding board, they are side tab on the flexible PCB.

[freakaftr8]

Re: Un50j5200afxza

Check on ohms test with a voltmeter.. Those tan rectangles caps. Are any of them reading low ohms? 0 ohms? Compare these readings to the working side of the panel.

[fcisolutions]

Re: Un50j5200afxza

The good side is reading 3.4 and the other side is reading 1.2 ohms.

[budm]

Re: Un50j5200afxza

Just to be sure, the good side shows 3.4 Ohms, or K Ohms, or M Ohms?
The bad side shows 1.2 Ohms, correct.

[fcisolutions]

Re: Un50j5200afxza

Yes I double checked that is correct.

[Andrew F. Ali]

Re: Un50j5200afxza

3.4 Ohms on the 'good' side seems a bit abnormal. We thought it might have been higher. The 1.2 Ohms on the 'bad' side seems to be the probable cause of your issue.

[budm]

Re: Un50j5200afxza

So can we see the pictures of these caps with the 3.4 and 1.2 Ohms readings?

[fcisolutions]

Re: Un50j5200afxza

This is the left and right side.

[budwich]

Re: Un50j5200afxza

post a picture of the display when you "get the lines" that you reported in the first post. That will likely determine what your next step might be... potentially tab removal or continuing investigation of components.

[fcisolutions]

Re: Un50j5200afxza

Here are some pics.

[Andrew F. Ali]

Re: Un50j5200afxza

IMHO that is a bad screen and may not be repairable. Could I get a close up focused pic of your T-CON Bd.? What is the T-CON Bd. No.? Also look on the T-CON BD and on the Panel Bds. to identify Test Points marked CKV, CKV1, CKV2, STVP, etc and CKVB, CKVB1, CKVB2, STVP1, etc.

[budm]

Re: Un50j5200afxza

There are many caps on the tab bonding board.

[fcisolutions]

Re: Un50j5200afxza

T-Con Board

[budwich]

Re: Un50j5200afxza

Here are some pics.

can you describe a bit about what the pictures are ... ie. both of the same side, tcon half connected, input signal?

It doesn't look good as suggested, likely a panel issue. A picture of the "good setup" might confirm more. Outside of that, are there tabs on both sides of this panel and if so check the side which was showing the "bad picture" ... look for heat or other issues on the tab "tape" / ribbon.

You might be able to save the set with a "tab removal" or a "tape cutoff method" (where tape is put on a portion of the tcon to panel connector to block part of the "bad"... that is if there is no side tabs.

looking at the first picture, that appears to be an issue with the tcon to panel cable as maybe not seated properly. A picture of the whole screen would be better as the actual "close up of the lines" isn't really important... more about where they are on the screen in terms of overall position and what else is happening on the screen (choose a good signal input).

[fcisolutions]

Re: Un50j5200afxza

I have two t-cons, and have tried both with two different sets of ribbons, and get the same results. When both ribbons are hooked up the backlights come on but the screen is entirely blank. Sorry about the picks not being that clear. When looking at the back of the t.v. and the t-con ribbon on might right is unhooked the left side of the screen looks fine. When the t-con ribbon on the left is unhooked the right side has the lines.