Chosen Solution
Hello. I have one vertical dotted 1px thin vertical line on my LG 55SM86 tv. I opened and checked every ribbon cable and it did not fix it. What is reason usually for this kind of thin line? Could it really be cable fault or 100% its within led panel itself as its not “band” that is faulty but just single line? Is it safe to swap left side cable ribbon with right just to check if its cable fault? Asking as on cable there is warnings written LEFT! and RIGHT! side, or its just for factory workers and repair shop to faster know which one goes where.. No warranty. Any suggestions will be appreciated.
@mezzoo that is a TAB error. This happens when the Bond that holds the very thin ribbon cable that connects to the top/side of the panel fails. Apply some pressure on the TAB that corresponds with where the line is on your screen. See if that changes anything. The attached image is just an example of what to look for.
I would never advice to flip the cables since it can shorten out your t-con board or your panel. It will all depend on the contacts on the t-con board. I do not recommend that
