samsung ue46c6000 weird alternating lines

[Mohammed Mecegguem]

Hello,

I encountered an issue with my TV long before noticing a pattern of alternating red lines. Initially, I replaced the T-Con board, but the problem persisted. After a year, I decided to open the TV again and found some oil leaks around the CPU, RAMs, and LVDS FPC connector, likely from the thermal pads. I reconnected the LVDS connector but still faced the same issue with the alternating lines.

At first, I thought the LVDS cable might be loose. I inspected the cable, found no damage, cleaned the connector, and reconnected it, but the issue remained. This led me to suspect a problem with the video processing from the mainboard or an issue with the COFs board/COFs.

Despite extensive searching on the internet, I couldn't find anyone experiencing the same issue.

Can anyone help me diagnose this problem further or suggest potential solutions?

[Mohammed Mecegguem]

[Diah]

i don't know what do you mean Oil you found on MB... but your suspect correct its main boards issue

[Mohammed Mecegguem]

it was the fpc connector on the main board the lever after applying little force it's gonne but the while lines double image like still there

[Davi.p]

There are already some topics about this model and also other Samsung and this typical fault, i have one of this and i noticed there are two twin clock level shifters called AG32xx, don't remember exactly, on the tcon, on them there is one or two outputs not regular, i don't remember all info, give me the time to find my discussion.. if i recall the correct freq. are 100Hz for some lines and 15khz for the most of them..

[Mohammed Mecegguem]

Hi Davi, i have removed the ckv1 ckvb1 and ckv3 ckvb3 hooked them to voff and removed the NTC (thermistor) to increase voff to -20 and it fixed the issue, but i'm worried about vgl -20v is it ok ? and why removing these clockes from tcon fixed the issue

[Davi.p]

I have watched this type of mod by a YouTube video but i don't fully understand this method, surely there is a clock line or more at fault, what is not clear is if is shorted at the panel or at the tcon or both , by decreasing the voff you probably balance the voff leak due to sh.cir.