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LG TV has no picture, but has sound and backlight.

I have an LG 43UK6400. After a long vacation away, I returned home and turned on the TV. The TV worked fine for a couple of minutes and then the image disappeared. The sound works fine, and the backlight is lit. The remote also navigates the menu. I tried resetting, pulling the plug and waiting etc. I tried looking with a flashlight to see if there is an image, but there isn’t. I have opened up the TV and haven’t seen any visually identifiable defects in the power supply or the main board. I saw online that there is a common connectivity issue where some pins of the ribbon cable will be defective, and putting tape on the ribbon cable will solve it. However, I tried removing each ribbon cable separately to see if the image comes up on half of the screen, but it didn’t. Also, my TV seems like it doesn’t have what’s called a tcon board; the ribbon cables go from the main board to the screen directly. What do you think might be the problem?

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@gaspardgaston your T-con board is integrated onto the main board. Clarify how the picture disappears. Something like all of a sudden or fades or maybe from one side to the other.

Since you do not have an image visible via the “flashlight test” the very first suspect would be a bad main board since that is what produces the image etc. (very simplified). Yes, it can always be bad ribbon cables but it should not be the first suspect for this. Post another image, this time of the label to the left of the power board in picture number. That will most likely be the label for your display panel. Lets see if we can find a datasheet for that.

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First of all thank you very much for your help!

The image disappeared instantly, entirely, once and for all. So now when I turn on the TV I can see the black backlight, but there is no image at all, despite the fact that the remote works and when I connect an input the sound works as well.

I have added the image you were asking for of the label: but here is the code written on it: "HC430DGG - ABTL3 - A11X"

da

Hello, @oldturkey03 I have a similar problem where the complete screen picture went off after turning on the TV.. I checked everything at the back and it seems when I remove the right hand side ribbon the left side works perfectly(no backlight issue) .. But As soon as I plug back the right panel ribbon the whole screen is without picture.. Could this just be a bad ribbon or would the whole board need to be replaced?

TV model: LG 55UK6470PLC, 139 cm (55 Zoll), UHD 4K, SMART TV

da

Ok, so I managed to get the picture back up and running.. But the issue now is that the colours are fluctuating, so basically the screen is going between different colors continously

da

How did you manage to get the picture back? Having same problem.

da

Hi, I have model LG 55UK6470PLC and same problem. Did you repair TV?

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Gaspard Gaston sarà eternamente grato.
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