Hello everyone,
The repair isn't finished yet and I'm still working on it, but unfortunately, we had a minor flood due to heavy rain.
So I have no choice but to wait to continue the work until the damage to the house has been repaired and I have everything back in my small workshop.
I'll continue as soon as I can.​

I can't believe. It was a small 0603 capacitor on the pcb where the cof strips are connected to. I couldn't find something faulty on the TCon but had fluctuations on every single voltage line.
PSU was 100% ok and Mainboard too. Had only problems on the TCon board...
I was just guessing and checked all the capacitors there for short circuits. I found a shorted capacitor on the left side.
I removed it with hot air and replaced it with another one from a TV board. Everything's working fine again.

What a strange behavior for a shorted capacitor. Have not expected this......

It's definitely inside the monitor. I opened it up and inside it is completely a LG. It was a pain to remove the small ribbon cables from the metal case cause they have been glued to it.
Everything looks quite good but I was expecting the fault an the T-Con and I truly believe that I'm right with my thoughts.The Voltages from the PSU to the T-Con are all stable but the Voltages on the T-Con are not.
I will write them all down and post them here cause I need here some help from someone with some experience.

I've expected some fluctuations and that something is pulling a...