Strange LG TV issue : Image vertical lines in black screen

[Ancient1]

Hi

Asking for a friend.

I'm used to black vertical line in otherwise good image - probable solution is a rubber to push and tighten the COFs bonding.
but here its the opposite !

TV has new T-con = same issue
A missing panel voltage would have global effect

So , what should one do ? how can I find where the fault is ?

Thanks !

[EazyBone]

Panel short it appears. I would say it's dead.

[Ancient1]

Thx EazyBone

Turns out the guy has 3 ( 3 ) of that Model with SAME issue. I asked him to note the production date , might be (emerging) known issue.
For now , I sent him to look for fluctuating VGH VGL LCx..

[Diah]

this LG EBT64022702 Main Board with ONE SoC knowing issue with BGA at SoC

[EazyBone]

this LG EBT64022702 Main Board with ONE SoC knowing issue with BGA at SoC

It'll cause lines like that?

[nomoresonys]

It can, many things can make strange lines, bad tcon, bad cap, tvs diode etc.

[Diah]

It'll cause lines like that?

yes. exactly these lines at the middle are SoC BGA

[nomoresonys]

Thanks Diah, I bet many tvs wound up thrown out only needing mainboard replace/repair. I remember SO many times that certain member, not Easybone but the one that always gives bad harmful advice telling everyone bad panel all the time.

[Ancient1]

this LG EBT64022702 Main Board with ONE SoC knowing issue with BGA at SoC

Thx ! it does make sense because these are image ( production lines ) lines and not no_image ( usually dark / black ) lines.

Does reflowing work ? or is it a faulty IC ?

I'll try to reflow and report here

[Ancient1]

test

[Ancient1]

LG 49SM5KB

Reflow = No change.
New T-con .

Could it be Firmware corruption issue ( Logo appears etc ofc )