Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

[Pioneerx01]

I know that lines on screen are usually caused by bad panel; however this one is a little different. Lines start on the left panel, but slowly fade as they go right (see attached picture).

When the TV is on and I start to slowly release the left ribbon cable latch, on certain occurrences I can get the picture to show perfectly with no discolorations, lines of shadows. But that is only when the latch is released in specific position. I get the same results when releasing latch on the T-Con and on the driver board itself. Applying pressure to tab bonds had no effect. I re-seated and cleaned all cables and connections.

Could this be a T-Con issue after all?

Thanks,
Happy New Year

[ReeceyBurger123]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

Possibly there has been a few threads on this, the motherboards were at fault.

[Pioneerx01]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

Well, I got another T-Con board and same problem, so I am guessing that it is the driver board and/or panel issues. Oh well.

[ReeceyBurger123]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

Did you even read what I put ? I said motherboard which has the Hdmi inputs etc has been known to cause this.

[Pioneerx01]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

The issue is across all inputs. If you look at the picture of the issue, it is concentrated to one half of the panel, other side is OK. Usually when mains are defective they cause issues cross screen.
You have mentioned other threads, what are the URL's?

[freakaftr8]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

That looks like panel failure to me

[jjanssen7]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

can be repaired with scotch tape covering one side of the connections to the tconn. try tape covering the last 8-9 connections on the ribbon that connects into left ribbon cable latch you mention.

[CapLeaker]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

What happens when you bring the OSD menu up?

[martino]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

can be repaired with scotch tape covering one side of the connections to the tconn. try tape covering the last 8-9 connections on the ribbon that connects into left ribbon cable latch you mention.

Please elaborate in as much detail as you can! I have run into this fault a few times,as a matter of fact the 55" I have hanging in the bedroom has it(can't sell it this way.might as well use it).

[jjanssen7]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

Power off the TV.
Remove left side ribbon (or sometimes the right, experience helps when selecting which side). You already discovered the left side was a problem so the below assumes we're working on the left ribbon.

Place scotch tape covering some (start with 8 to 10) of the connectors, always starting near the edge (in other words, when trying this, the left side or the right side of the (left) ribbon will always have connectors covered by tape).
Insert ribbon back into the tconn carefully and test.
Do not leave the TV on long. Sometimes this can "fry" a tconn.
Power off TV.

If that doesn't work try covering some on the right side of the left ribbon.

If the picture is worse, etc you will have to put on a "thinner" piece of tape, cover maybe only 5... it's a bit of an acquired talent... covering the least number of the connectors to get a good picture but enough to stabilize the image.

I have repaired 5+ of these LG panels doing this.

[braxton]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

Power off the TV.
Remove left side ribbon (or sometimes the right, experience helps when selecting which side). You already discovered the left side was a problem so the below assumes we're working on the left ribbon.

Place scotch tape covering some (start with 8 to 10) of the connectors, always starting near the edge (in other words, when trying this, the left side or the right side of the (left) ribbon will always have connectors covered by tape).
Insert ribbon back into the tconn carefully and test.
Do not leave the TV on long. Sometimes this can "fry" a tconn.
Power off TV.

If that doesn't work try covering some on the right side of the left ribbon.

If the picture is worse, etc you will have to put on a "thinner" piece of tape, cover maybe only 5... it's a bit of an acquired talent... covering the least number of the connectors to get a good picture but enough to stabilize the image.

I have repaired 5+ of these LG panels doing this.

Does this imply that not all of the connections from the ribbon are required to generate the image?? Or are you taping the back side of the connectors to make the cable fit more tightly?

[martino]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

excellent! Thank you for that information,will try that on this 55" asap.

[jjanssen7]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

Not all the connections are required to generate the image. The tape trick is a deliberate attempt to cover some of the electrical connections.

[dogdad]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

Almost the exact symptoms on a Sony Bravia. Turned out to be one of the TAB strips (I think that's what they're called) that wasn't making good contact with the panel edge. Found it by gently poking along the TAB strips til I found the one that cleared up the problem. I then put some weather-strip material over it to keep it pushed down and making contact.

BTW, I found that you CAN fry a T-conn board by unplugging some of the ribbon connectors. Wanna guess how I know?

[braxton]

Re: Can these horizontal lines be caused by a bad T-Con on LG 47LN5400?

excellent! Thank you for that information,will try that on this 55" asap.

Any luck?