dotted green vertical line

Hi Guys,

I have an LG NanoCell Sj8000 49 inch TV set which worked great at my parents house.

it had an WIFI issue where it sees the network but cant connect, or connects and then drops and then can’t see the networks.

I took it to my house to test and try to deal with. it was kept nicely and did not take any beating on the way.

I am pretty sure it was fine when I installed it at my place, however minutes after we noticed a dotted green vertical line on the TV.

it is on all input, even on picture test.

I found this thread here

LED TV - one single dotted vertical line

and I opened it opened it up, played and wiggled with the WIFI wiring, also with the tabs connections but the vertical line persists. I am not sure I did the right action while the TV is open.

this is how it looks like

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any idea what is the cause? what else can I do? what specific action to take with the tab wiring?

here are some photos of the TV opened

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