DSI custom board problem with STM32F769BI MCU

[GSink]

Hello,

I used STM32F769I-EVAL board as a design reference for custom board. However, I could not achieve correct operation of MB1166 LCD board 

which is connected via DSI. It works well on the evaluation board.

When MCU tryies to display a picture, screen fickers with coloured lines and stays white.

Theres some hardware problem which I cannot figure out. Im attaching custom board schematics of DSI peripheral. STM32F769BIT6 MCU is used.

Any help to debug such issue would be apriciated.

[Du1]

Schematics looks fine at first glance, did you double check layout for footprints missmatch and doubled check the differential pairs for proper routing?

[GSink]

Dear Du,

footprints are correct. I figured that DSI routing could have been a problem on my first PCB design. So this time I designed around the DSI. My approach was to reduce length of DSI route as short as possible while maintaining DSI_CK, DSI_D0 and DSI_D1 lengths as equal as possible.

Im attaching PCB routing of DSI connection and DSI net lengths.

[Du1]

Did your code have any change? Any IO remapping or reconfigurations? What else have you checked through so far that you could rule out for sure?​
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[Tesla DeLorean]

Perhaps have an ST FAE review the PCB and trace layout/lengths, circuit performance likely to be critical at these speeds.​

[GSink]

Dear Clive Two.Zero,

I will try to contact them through the supplier of the evaluation board.