Samsung lcd le40a866 vertical lines

[remacomp]

I have problem with 3-4 year old samsung lcd. You can see it on attached picture. Vertical lines are not always on same place, they follow text, subtitles,...
I read about it, and some people said that it dissapear when TV is warmed up.

So i used hair dryer and warmed up boards and TV works ok till next day.
Then i made reflow on bga chips on main board, but same result, it worked but when cooled it doesnt.

I read a lot similar threads, but didnt found solution.

Does anyone have suggestion what to do?

[remacomp]

Re: Samsung lcd le40a866 vertical lines

i forgot to say that picture is sometimes worse like in attached file

[tom66]

Re: Samsung lcd le40a866 vertical lines

Probably tab bonds (panel defect)
Different symptom same cause
http://www.youtube.com/watch?v=purk_SyiT44

[remacomp]

Re: Samsung lcd le40a866 vertical lines

thanks for answer tom66, but i'm pretty sure that it's not problem with bonds.
First, like i said when i warmed TV or only mainboard, without touching tab bonds, its temporary fixed.
Second, i tried with pressing on tab bonds but nothing changed

thanks anyway

[tom66]

Re: Samsung lcd le40a866 vertical lines

Did you reflow BGA on main board or t-con? Main board cannot cause this symptom. We have found t-con replacement doesn't fix this problem either, at least in the few cases on this forum.

[remacomp]

Re: Samsung lcd le40a866 vertical lines

i reflow bga on mainboard, and i did it one more time today, but now without success.
i turned it on and off couple times and sometimes i have problems like on pics, and sometimes everything is ok. damn

could it be power board problem... ?

i'm really confused

[tom66]

Re: Samsung lcd le40a866 vertical lines

I think it's more likely the heat you are applying to the main board is heating something else up, the panel. Try applying light (<50C) heat to the panel tabs.

[freakaftr8]

Re: Samsung lcd le40a866 vertical lines

I have something similar going on with that Samsung 40 inch LCD don't remember the model number but its a 2008 model. anyway I have vertical streaking going on the left side of the screen with the artifacts that are on the screen so I started tearing into it tab bonds make no effect and so I went ahead and started hitting itwith freeze spray first with the screen no effect then with the t-con board and no effect so then I lastly tried the mainboard on the top side where the lvds exits and all the sudden the problem went away but then came right back about 30 seconds later it looks like maybe t-con board was absorbing the freeze spray and I went ahead and started spraying the mainboard the problem went away and then came back so on my symptoms I'm under the anticipation that the t-con board is bad I may just go ahead and order one and see what happens

[Knuppel]

Re: Samsung lcd le40a866 vertical lines

i forgot to say that picture is sometimes worse like in attached file

Did you ever fix this?
I have a Samsung LE40A656 with the same symptoms. Vertical lining, not fixed but moving with the brighter parts of the image like subtitles and channel logos.
It's on all sources and tv menu's. Not the ‘hmdi x no signal' though.

It was just there one day, over the entire screen, not just one side. That would point in the direction of tcon right? Tab bonds would mean the lines are fixed or at least at one side of the screen? Don't see any burning or bad caps on the boards, and it's always there heated or not.

[Knuppel]

Re: Samsung lcd le40a866 vertical lines

[Knuppel]

Re: Samsung lcd le40a866 vertical lines