LG TV has weird flickering blue cast on picture

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LG Television

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cwthorpe @cwthorpe

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发帖于: 2023年2月7日

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LG TV has weird flickering blue cast on picture

Recently, my LG49UH610T 4K TV started flickering - it isn't the backlight but one of the colours flickering on and off, leaving the screen with a mostly blue colour.

This flickers on and off constantly (but these days it is mostly blueish)

Weirdly, there is a narrow stripe at the top of the screen that is still the right colours:

I have already tried reattaching all the ribbon cables on the boards, and then bought a T-Con board off e-bay but that didn't fix it (actually, maybe it made it worse, so perhaps it was a dud). I then replaced the controller board but that made no difference.

My question then is what to try next - should I get another T-Con board and hope that it works? Or is it likely to be something else going on?

Edit - adding some photos of the boards.

6870-584B T-CON board

EAX66943504 main controller

EAX66923201 Power supply board

Overall arrangement:

Closeup of T-CON board

Connection to screen

After replacing the T_CON board, the screen is not flickering, however the colours remain distorted.

There is a narrow strip along the top of the screen which is uncorrupted

Here is the screen when removing one of the pair of ribbon cables coming out of the T-CON board.

1 Removing the cable on the left

2 Removing the cable on the right

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We have this issue.. we are not at all clued up or tech savvy.. is there a way we can get this fixed? Or should we just buy a new TV?

由 Emily 完成的 2天前2024年6月30日

@emily24361 it will depend on exactly what issues your TV has. Let us know the exact issues, the exact model number and the make for your TV. The good thing is that you do not have to be to tech savvy for as long as you don't mind taking some directions (yes, sometimes those are confusing) and all you most commonly need is a couple of hand tools and maybe a multi meter. No worries, we will always show you how to use it and where to measure etc.

由 oldturkey03 完成的 2天前2024年6月30日

Aw thank you so much.. It’s literally the exact same issue. The TV will work for a few minutes then start glitching with a blue tint.. then it will work again for a while then it does it a lot.

The make is LG webOS TV UJ634V

I have a video of the TV issue if you need me to send it ?

Thank you so much

由 Emily 完成的昨天2024年7月1日

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We have this issue.. we are not at all clued up or tech savvy.. is there a way we can get this fixed? Or should we just buy a new TV? — Emily
@emily24361 it will depend on exactly what issues your TV has. Let us know the exact issues, the exact model number and the make for your TV. The good thing is that you do not have to be to tech savvy for as long as you don't mind taking some directions (yes, sometimes those are confusing) and all you most commonly need is a couple of hand tools and maybe a multi meter. No worries, we will always show you how to use it and where to measure etc. — oldturkey03
Aw thank you so much.. It’s literally the exact same issue. The TV will work for a few minutes then start glitching with a blue tint.. then it will work again for a while then it does it a lot.

The make is LG webOS TV UJ634V

I have a video of the TV issue if you need me to send it ?

Thank you so much — Emily

oldturkey03 @oldturkey03 声誉积分: 789.5千 1.1千 897 2.4千 · Answer 1 · 2023-02-07T17:17:14-07:00

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oldturkey03 @oldturkey03

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发帖于: 2023年2月7日

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cwthorpe under any other circumstance, I would go with a T-con board as well. This looks like a bad Gamma IC. Now depending on your panel, there can also be a Gamma IC on those boards. Those are the boards that are directly connected to the panel. The ones the T-con board connects to. Let us know which board your changed here "I then replaced the controller board". I am not certain what you mean by controller board. Anyhow, try another T-con board,. After that we need some really good pictures of the LCD driver boards to see if we can identify if this one has a Gamma IC,

cwthorpe I marked the points with red arrows. Let's see if we can find out whats going on with this.

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thanks. I have just ordered another T-con board 6870C-0584B from a different supplier, maybe it will work :)

Will upload some photos of the boards. The "controller board" is the main CPU board. I didn't touch the boards connected directly to the LCD - they are under the bottom edge of the TV.

由 cwthorpe 完成的 2023年2月7日

@cwthorpe okay so the one you replaced is the main board. Yes, those boards under the bottom edge are the once we may have you take a look at. Those are a pain since they are attached to the panel via a special process and are not meant to be replaced/fixed/etc. by the DIY'er :-( but nobody says we cannot get you to replace an IC :-))

If you have a multimeter and a steady hand, we might be able to get the Gamma Voltages for your T-con board. You could see if it has the right voltages. We need a really good clear picture of the T-con board. OR we could just wait till you get the new board :-)

由 oldturkey03 完成的 2023年2月7日

Hi @oldturkey03, thanks - I have updated some clearer pictures. I do have a multimeter but nothing more, so could make some measurements if that would help.

由 cwthorpe 完成的 2023年2月7日

Here are the measured voltages:

VGL1 -6.9V

VGL2 -15V

VGH 28V

Vcc 3.3V

Vcore 1.22V

VDD 16.4V

Vcc18 1.8V

F1 12.8V

VGH_even flips between 28 and -15V about every second

VGH_odd same

Vcom1 4.6V

Vcom2 4.6V

VcomRFB 4.68V

Do these measurements indicate anything?

Cheers!

由 cwthorpe 完成的 2023年2月9日

@cwthorpe VDD is the Gamma IC control and it has the correct voltage. The rest looks pretty close to the data I have Vcom lines are a little lower than what I have. I get between 5.9 and 5.6 but that may be negligible. Glad the voltages are there but we'll just have to see what your new board shows.

由 oldturkey03 完成的 2023年2月9日

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LG Television

LG TV has weird flickering blue cast on picture

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