Samsung UE48JU7000 screen issue after backlight replacement

[ScHAmPi]

Hi all,

Because of two bright spots and a couple of dark spots I decided to replace the backlights in my Samsung UE48JU7000. See attached photos:


I thought all went well, but after full assembly and testing it out it turns out not all is fine. The backlights are completely fine but I have some weird issues on the right half of the screen. Since I didn't really touch the T-CON board (apart from taking out the ribbons of the display and reconnecting them on assembly) it would be weird that the issue is with the T-CON board... But based on the behavior of the service menu test patterns I wonder if they could provide clarity on the cause.

Although I was very gently with the display I guess one of the panel ribbons could have loosened somewhere. I couldn't spot anything visually and slight taps on them doesn't seem to do anything.

Based on the patterns video below hosted on my Google Photos, does anyone have any experience confirming/denying that this is a T-CON issue?

https://photos.app.goo.gl/Tv9HEv99wNkmvLCt8

I've already:

• retried the original backlights, issue stays
• reseated all ribbons on the T-CON board multiple times
• visual inspection of the all ribbons, they seem fine to me
• tried running the tv with only one of the two T-CON ribbons connected, in neither case the screen shows anything

In case of any other ideas, please let me know! Thanks!

Kind regards,
ScHAmPi.

[Chrissygizmo]

Hi , did you manage to find the problem? I have the same issue on a similar set

[ScHAmPi]

I did actually. It wasn't the T-CON. On the "broken" side I tore of the COF tabs. As i pulled them off the part of the screen right next to them cleared up. It was the most satisfying feeling. I'm not sure what their function is and whether the solution is longterm viable because unfortunately I cracked the display upon reassembly.

Anyways, here's a video of the COF tabs being torn off.
https://photos.app.goo.gl/5wTWWaZUFnK4Q1xt6

Good luck!

[Chrissygizmo]

Thank you so much for your reply, did yours only have a half dark screen or did it have horizontal lines on too? Mine is just half dark but someone has just commented on my post saying that unless I have horizontal lines as well as dark screen then the side ribbon removal doesn’t apply to me

[ScHAmPi]

It was dark on the right half of the screen. In the video I had already removed some of the COFs. I guess if only some of them are bad it would show up as horizontal lines (well... bands) I guess.

[nomoresonys]

Thank you so much for your reply, did yours only have a half dark screen or did it have horizontal lines on too? Mine is just half dark but someone has just commented on my post saying that unless I have horizontal lines as well as dark screen then the side ribbon removal doesn't apply to me

No, I didn't say it HAD to have horizontal lines, I said it can have them. I advised having a close look at the cofs on the suspect side, because there is usually visual evidence of a bad cof. I have had a tv or 2 with a bad side cof, one was pretty tricky, had to look at both sides of the cof to find the defect, which was a very tiny hole.