Pixels reacting in slowmotion 55PUT6201/12

[Repair_dane]

Hi guys,

A friend gave me this TV with slow pixels on 1/3 of the screen in the left side. Most of the "sick" pixels will get the colour right after several seconds if you let it stay on steady image.

In some places the pixels look like they have been burned in and stay that way.

I ordered a new t-con, hoping that it would fix the problem. I recieved the wrong type which doubled the image so I had the same image in left and right side, but the error was still in the same pixels. So it's not the t-con

Has someone seen this before in a tv?

I would love to upload a video, but I'm not sure how

[budwich]

Re: Pixels reacting in slowmotion 55PUT6201/12

the fifth picture indicates a likely panel issue and probably not related to the tcon.

there is either an issue with tabs on the side (the side where the horizontal lines shown originate) or if there are no visible tabs on the side, a problem with the in panel drivers. IF there are side tabs, check them for any visual issues or feel them carefully for heat differences. IF there are no tabs, then the alternative effort is to use the "tape cutoff" method by place tape on a portion of the contacts at the tcon on the tcon to panel cable / connector to block some portion of the signal going to that side. Read up on the method to get a feel for how others have used it.

[Repair_dane]

Re: Pixels reacting in slowmotion 55PUT6201/12

the fifth picture indicates a likely panel issue and probably not related to the tcon.

there is either an issue with tabs on the side (the side where the horizontal lines shown originate) or if there are no visible tabs on the side, a problem with the in panel drivers. IF there are side tabs, check them for any visual issues or feel them carefully for heat differences. IF there are no tabs, then the alternative effort is to use the "tape cutoff" method by place tape on a portion of the contacts at the tcon on the tcon to panel cable / connector to block some portion of the signal going to that side. Read up on the method to get a feel for how others have used it.

Thank you for that answer.
I will look into it soon and get back to you with an answer

[Repair_dane]

Re: Pixels reacting in slowmotion 55PUT6201/12

So, there are tabs on the sides. I carefully checked for any damage which there was not, but by touching 2 of the tabs the tv started flickering and the picture moved across the screen only to leave a lot of white vertical lines.

To me that looks a lot like a loose connection.

Can I somehow test if these side COFs are getting the right signal?

Kind regards

[budwich]

Re: Pixels reacting in slowmotion 55PUT6201/12

don't play with the tabs too much... and when you do be very careful and "tender".

From the picture, I can't tell much about which tabs you are referring to.

Further as "my explanation", the drivers are very dependent on the signal and it timings to cause the appropriate result on the panel. So if that has issues, the outcome will not be very good. IF you have a "bad tab", it may causing "loading" such that it impact signals on a number of the panel points that are being driven... kind of like a "parallel connection".

To help determine what you might be able to do, you need to do a "disconnect tcon to panel" cable test. Basically, with power off, disconnect one of the tcon to panel cables, and then see what the resulting picture happens when powered back up. Repeat the test, doing each cable ... you haven't posted a picture of how the cards are all connected so I am guessing that there are only two tcon to panel cables (ie. one for each half).
Post pictures of the display results from the test... go from there.

[Repair_dane]

Re: Pixels reacting in slowmotion 55PUT6201/12

I barely touched them, So they probably were loose to begin with.

You are correct, 2 t-con cables. It would appear that the side that I have disconnected turns white whether I disconect the right or left side the way you describe.

It seems to be a little bit "worse" on the 2nd picture.

By the way I have no idea what I'm looking for here.

thanks for helping out

[Davi.p]

Re: Pixels reacting in slowmotion 55PUT6201/12

Hi, i think TV has been hit previously on the side where you have touched the TABs , them looks good but probably were already cracked. If is not this anyway the only conclusion is that you try to remove all tabs of that side and pray, no results, screen in the bin... bye.

[budwich]

Re: Pixels reacting in slowmotion 55PUT6201/12

I barely touched them, So they probably were loose to begin with.

You are correct, 2 t-con cables. It would appear that the side that I have disconnected turns white whether I disconect the right or left side the way you describe.

It seems to be a little bit "worse" on the 2nd picture.

By the way I have no idea what I'm looking for here.

thanks for helping out

I think you almost understand.... or maybe I don't understand you description. The pictures posted are of the two different side... right? I think I see.... now

Look closely at the cable going from the tcon back to the main board... make sure it is properly seated as those pictures almost give that impression.

Further, it is possible, depending on the tcon design, that a component in it has failed and those producing (not producing) a bad display. For example, the vizio sets have this issue.
The other thing, is make sure that the cabling that you are playing with at the tcon connectors is properly seated... any misalignment will be bad.

It is rather strange that you are not seeing any type of picture on half the screen and that "lightly" touching the tab on the side caused such a result. Perhaps a closeup of that area might be useful.

IF I understand your posts, you have two tcons... right? do they both give the same result with the "cable disconnect test".

Lastly, at the bottom of the set, do you see any type of "window washing contamination"... you need to remove the front plastic bezel to look at the panel connections therein. "window washing" is a known cause for lots of problems.

[budwich]

Re: Pixels reacting in slowmotion 55PUT6201/12

one other thing related to looking at the tabs as explained, look at the picture of the tcon... you can see the tab going from the bottom edge board around to the front of the panel... those are what you need to look at.