AIO-3399J_V12 vs. V1.3

peksuj

Hi,

I have 16 pcs v12 models and new I ordered 1 pcs more, I get v1.3 board. I get dual-LVDS work on v12 board (using a LOT of time to research material how to configure kernel to work with dual-LVDS). Now I update v1.3 board using same kernel wich I use v12. Display in v1.3 board is now only grey. HDMI port work OK. I try newest (Linux) kernel with Ubuntu 16 and 18.

What is changed in this new v1.3 model and what I must do in (Linux) kernel config? To get dual-LVDS work like in v12 board.

Thanks,
Pekka

peksuj

Hi,

I found the problem. LVDS port VCC pins give 0 volt. I test power selection connector and LVDS VCC pins connection and there wasn't connection of these pins. I put jumper wire from 3v3 port to LVDS port VCC and now display works like charm. Is this designing bug or manufacture problem?

But MIC port doesn't work yet... I need to mesure all MIC connections on PCB to make sure that there has no problems.


Pekka

CarletonBechte

Hello! @Merge Fruit The fact that you have temporarily connected the VCC pin of the LVDS to the 3.3V source is a temporary solution, helping the screen to work, but this is not a long-term solution and can lead to other problems with the stability of the system.

trinoctial

duplicated, my bad

trinoctial

@escape road Glad you figured out the LVDS issue with the jumper! It could indeed be a design or manufacturing difference between the v12 and v1.3 boards, especially with power routing.

For the MIC port, I’d check the device tree and make sure the mic pins are properly mapped and enabled. Sometimes those need specific tweaks in the kernel config as well.

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