Question LVDS to EDP 30 pins issue

[reptooyep]

Hello to all,
I'm facing troubles to display my image on a LAPTOP EDP LED screen using a TAIDACENT LVDS EDP V2.
i've adapted the cable for my SBC board connector. The board is an AAEON PICO KBU4 SBC board with 30 pins LVDS.
The screen is a LED EDP laptop screen (i've tried several ones).
I cannot find any documentation about TAIDACENT LVDS EDP V2 , all i can find is few words on AMAZON site saying :
Works with LVDS set to 1920x1080 24bits.
I've tryed several (hundreds) bios settings but i cannot get any image displayed.
The board is detected as a 2nd screen by windows 11.
The LED lights shine only when i set the bits to 18 bit but nothing is displayed.
I'm asking myself why do the signals BKL_ENABLE and BKL_ADJ exist on two different connectors. One pair is on the 30 pins LVDS connector and the other one is on the 5 pins backlight driving connector. I've tried both signals without much luck.
I've heard about a resistor to toggle resolution on the converter board but the only one i can find is to toggle 3.3v and 5v voltage. My SBC board is set to 3.3v, as the converter board.
Can someone help me with that ?
Many thanks

 

[CParsons]

On some of these boards, there’s a strap resistor/jumper that forces the LVDS input mode (single-channel 6/8-bit vs. dual-channel 8-bit). If it’s wrong, the panel won’t sync. What you found (3.3 V vs 5 V) is for panel power only, not resolution. The real mode-select resistors are usually unlabeled SMD pads near the LVDS input chip (often a PTN3460 or similar eDP bridge IC). Without documentation, you’d need to trace or probe.

 

[reptooyep]

Oh,
Thank you very much. I have an oscilloscope and many testing equipements but how do you probe this kind of signal ? The resistor only gives the chip a high or low level for the selected resolution ? I guess so. Those small board lack of documentation so, it's hard to set up.
i try to past a link to the board picture but the site do not allow my link

 

[COLGeek]

Upload images to a site like imgur.com and then post a link here.

 

[reptooyep]

https://imgur.com/a/LsRQLFo

View: https://imgur.com/a/LsRQLFo

 

[reptooyep]

Upload images to a site like imgur.com and then post a link here.

Hello,
Did you have a look at the picture ?
For me, there is no resistor tweak to toggle resolution on this board.
I've ordered another model with two setups for LVDS 2 lines, hopping that the wiring will be the same.
Many thanks

 

[reptooyep]

In windows display settins, i see that the screen is detected as a 1366X768 and in bios parametters, i've set the resolution to 1920X1080.
For a resistor issue but i cannot find them on the PCB.