Lg 50ln5700 horizontal moving black line on bottom of screen

[Gdog215]

Hello bought this tv with intermittent back light a few months ago and finally got time to work on it. I replaced all the led strips have full clear picture but now slight horizontal line that seems to move on the bottom 3 inches of screen. Already cleaned and reseated lads cables to tcom. Bad panel?

[neilc6]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

https://www.badcaps.net/forum/showthread.php?t=71885

[Davi.p]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

If you think this it's a not good tv to use as is then you can try this: disconnect one at a time the output flats of the tcon an see wich is the faulty side, with the flat cable of the faulty side connected and image on screen, cut a square piece of opaque tape wide as much as 5-6 rows of pixels high and place it in corrisponence of the begin of the defect and exactly at te begin of the witdth where pixels starts at the side, then switch off the tv and take a sharp cutter and with magnifying glass you have to cut exactly before the first pixels in width starts, if it is too difficult to center the blade it's better if you cut in the center of the first pixel than before its begin, don't make too much pressure, it is almost easy to cut. Unfortunately i can't do this test because i have no cracked screens at the moment with a partial image to make the test on, because the cracked screens i bought are very easy to lost the remaining image cause the cracks runs easily. This job its valid only if your screen has no side tabs. In the truth the best work to do would be to remove the glass foil and flip it because on the front side there's a polarizer film that obscures all the pixels, instad in the back side you can see even the pixels and the gate drivers circuit and where to cut better, it is useful those goggles with magnifying glass and led light that are sold on ebay/aliexpress.

[Gdog215]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

when I unplug one side of tcom and than the other see pics
what does it mean?

[Davi.p]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

Yes this is typical of LG screens of today, it's normal, unfortunately in this way you can't judge which side is bad, i don't know what to do... anyway T-con not tcom..
if there are many silkscreens then post a good clear tcon picture or better link a shopjimmy one that are the best..

[Gdog215]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

Here's the t con card

[Davi.p]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

No this is not what i call a good picture.. search its brand and model in internet with image search and post here a big clear picture..
sorry i've noticed many errors in my post #3, 1. "and" not "an", 2. "which" not "wich", 3. "width" not "witdth", "instead" not "instad"...

[Andrew F. Ali]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

You might be able to fix this by placing a piece I=of stationery tape 1cm wide on the right (looking from the back) FFC going to the Panel Bd. You would have to try it several times along the width, by trial and error, of the FFC to get the correct spot. It will take some time but a little patience will get you there. This is called the 'CUT-OFF' Method.

[Biruslapio]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

when I unplug one side of tcom and than the other see pics
what does it mean?

The right side(facing front) is the only that has an horizontal line on those pictures,also some glowing gradient on the bottom which happens often on panel faults, the left side looks more normal.

[budwich]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

x2

[Davi.p]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

Biruslapio it is not enough as a proof, needed some tests, if you want to proceed as "hoping in God"..

[budwich]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

there is "no hoping in god". All this means is the OP should focus his efforts on using the "tape cutoff" method on the connector associated with the right side of the panel. It is not a "catastrophic method" as long as they are careful with the connector so "god" won't come into play.

[nomoresonys]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

there is "no hoping in god". All this means is the OP should focus his efforts on using the "tape cutoff" method on the connector associated with the right side of the panel. It is not a "catastrophic method" as long as they are careful with the connector so "god" won't come into play.

Amen budwich, God won't be needed for this little situation.

[Davi.p]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

Yes maybe the tiny little line that is visible is the true defect, but i had in mind my technique not the tape masking technique, this last is a risky one cause switches off a big part of the screen, furthermore in my case the result is far from perfect vision, it's advantage is that in the first times after it's reversible.

[Gdog215]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

No matter where I place the tape couldn't get rid of the black horizontal line.
Until I watched a movie, the movie had black borders on top and bottom.
It looks perfect with the top n bottom black borders. Just gonna give this tv to my parents their Comcast cable box has the up down black borders on every channel.

[Davi.p]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

This is what i was telling, but unfortunately some stupid people continue on their old road with the same old refrain... tape is not enough here..

[nomoresonys]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

Now he's calling people "stupid" I would get an infraction for that, hmmmm.

[Davi.p]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

I know few words in english, it is not come anything else better in mind than "stupid".. some people has learned 2-3 things crossed and comes here to repeat them endless..

[nomoresonys]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

Yes this is typical of LG screens of today, it's normal, unfortunately in this way you can't judge which side is bad, i don't know what to do... anyway T-con not tcom..
if there are many silkscreens then post a good clear tcon picture or better link a shopjimmy one that are the best..

Everyone is "stupid" right? RIGHT here you admit you don't know what to do, then you turn right around and call people "stupid" like you have the fix. Well like I asked before WHERE IS IT THEN???????

[nomoresonys]

Re: Lg 50ln5700 horizontal moving black line on bottom of screen

davi why don't you put up a youtube video of all these sure fire "techniques" you know of that fixes everything???? or are you just a frustrated little would be "inventor" of techniques???? YOU are "smart" enough to figure out how to do a youtube video right??????