One vertical green line on my AQUOS LC-70LE740E TV

[Bagel]

Hello,

on my AQUOS LC-70LE740E LCD TV there is a vertical green line on the screen. (pictures below)

Does anyone know what the issue could be?





Thanks in advance

Edit:


Up close it looks something like this

[wraper]

Faulty LCD panel.

[Bagel]

Thanks for the quick response! Yes it seems to be a faulty LCD panel. Is there anything worth trying before it goes to the dumpster?

Edit:
Factory reset did not work.

Edit2:
Youtube videos show LCDs with a vertical line being fixed by reinforcing the contacts. Might me worth a shot?

[Rasz]

Its still a 70" panel, Imo too big of a waste to just bin it. It has VGA meaning there is option of configuring custom resolution (1600x1080?) and moving picture to the right, you will end up with 50" PC ~3:2 monitor.

[james_s]

You could try gently pressing on the ribbon connections along the top and bottom of the panel in the area of that line, there is at least a chance that you have a bad connection there.

[wraper]

It's probably possible to somewhat fix it. I've had some success pushing driver IC onto the flex cable it sits on to restore the lost connection. When problematic area found install something that pushes it permanently. If you are lucky, it may last for a while.

[Bagel]

Thanks for the tips! I will ask my uncle Bob to take it apaaart with me and we will see what we can do. Im going to report on this here.

[mon2]

Post your issue and details on the badcaps forum for tv and monitor repair. There are many there who can confirm if the fault can be serviced.

https://www.badcaps.net/forum/forumdisplay.php?f=31

[Bagel]

Will do! Thanks alot! 

[Bagel]

When I loose the contact on the connection and apply different amounts of pressure I get this kind of artifacting (some of it looks just like the original vertical line. The original vertical line however does not go away when reconnecting):

[james_s]

Well that sucks. The fact that it changes when you press on it definitely suggests there is a fault there though.

I forgot to ask this but did you confirm that the set is out of warranty?

[Rasz]

you can also try pressing on the ribbon glued to the PCB under the connector

[Bagel]

Thanks for all the replies so far!

To be clear...
This is the connector fully engaged:

This is the connector fully loosened

This is one of the many artifacts that apear, when the loosened connector is lightly pressed down (notice the permanent line is brighter):

This is another one of the many artifacts that apear, when the loosened connector is lightly pressed down:


These artefacts are lines or plains that are white, blue, red or green. Next to that connector is another one that behaves the same as far as I can tell.

Another idea would be to replace one of the PCBs:


There is another one on the right of them but its covered by a metal plate. The whole housing is of metal, beautiful construction.

Maybe unplugging the cables on the pcbs and cleaning them would do the job? I have no clue about this stuff, but im feeling like dumpimg this high quality made in japan TV is a waste. Defenitly no warrenty on this one. Pressing the ribbon under the connector doesnt effect the screen at all.

[james_s]

Whatever you press on that affects what is on the screen has a problem, it's hard to tell from the description what that is.

[Bagel]

Whatever you press on that affects what is on the screen has a problem, it's hard to tell from the description what that is.

I lift this connection:

Like this:

[drhex]

Hallo,
it is perfectly normal that things change when the connector is open and you move the ribbon cable. Does the green line disappear when you disconnect the flat cable? If so, you probably have an issue in the driver section on the other side of the cable, the panel may be fine. If it stay no matter what you do the panel is probably shot.
Florian

[Rasz]

Leave that connector alone closed. Replacing boards wont help in this type of defect.
Problem is usually the ribbon bonded to the glass, its under your finger on the photo, under the ribbon plugged in connector. Its either bond itself of the chip on flex on it.





now im NOT saying you should whip out soldering iron and start burning stuff up! Take a credit card or something similar flat and stiff and gently run it side to side over the bond while monitor is running to see if your line changes

[james_s]

I fixed several old Game Boy handheld games years ago that had bad bonding to the glass. I put a piece of paper over the back and rubbed it with the tip of a hot soldering iron, they were still working last time I used them.

[Bagel]

Hallo,

I have disconnected the flat cable


The screen goes partly white masking/making disapear the green line.

I will now check the contacts with a plastic card.

Oh man, the gameboy is my favorite console. Ironically I had green vertical lines on mine decades back. Thought of buying one in 2008 when people where selling them for one euro...

[Bagel]

Went over the bond with my finger, that had no effect. Gonna try it with something stiffer.

There is another connection that goes straight to the PCB behind. Loosening does make a larger area go white.





EDIT: using a piece of plastic did not help.

[drhex]

Seems like one column driver is broken. Given it turns white on disconnect I'd assume that a high state on the line is off - you could try to find the right line on the connector and pull it up which should tell you which side of the cable it is.

[Bagel]

you could try to find the right line on the connector and pull it up which should tell you which side of the cable it is.

I don't know how to do that.


If I have checked and cleaned all connections. Maybe installing this PCB is worth a shot?

[james_s]

You could try, I doubt it will help, but with such a nice TV it's worth exhausting all other options before scrapping it. Have you looked on ebay for a used board?

[drhex]

OK, looking at the service manual and the amount of pins these aren't driving the columns directly. The actual drivers must be somewhere on the panel - you are out of luck probably. You can change the LCD control board if it doesn't cost a lot. Parts #s are here: https://www.manualslib.com/manual/961194/Sharp-Lc-70le740e.html?page=180#manual. Seems to me it should be DUNTKG031FM51 or DUNTKG031FM52. Manual says to replace the panel under these circumstances. Panel should be R1LK695D3GW80F.

[drhex]

Board you linked is for LC-70LE741E - most probably not compatible. You can obviously take the risk and try it, it is broken as is...