DS90UB934-Q1: Some 934 Video shaking

Hello Yao,

just for better understanding, The UB934 is receiving the signal from which SER? Can you provide the image sensor resolution, data type and number of frames per second?

So, the video signal coming out of the UB934 is going into the ML86175, which is processing it and then outputting into display A? What about B signal path?

Are you splitting the signal at the output of the UB934?

What is the job of the UB947 and UB948?

Hi Jaradat,

Thanks for reply.

UB934 receive video signal from UB933, the image sensor resolution is 960P, data type is YUV422, fps is 25.

We do not split the signal output form 934. UB947 and 948 are tranfer the lvds signal which come from 86175 into display panel.

I can not understand what is the meaning of display A and signal B.

Best Regards.

With Display A and B i mean what you called module or region A and Module or region B

Hi Jaradat,

Region A:video signal coming out from the UB934 and then going into the ML86175, finally output to display follow by 947/948;

Region B:86175 draw those icons directly, then output to display follow by 947/948;

Best Regards.

Hello Yao,

What is the used pixel CLK? 

Which clocking mode are you using? External clock or PCLK?

Have you tried another Cable? Shorter or longer? 

is this issue seen only on one system or more? Have you done ABA swap, i.e. good device on the suspect board, and the suspect device on a known good board?

Hi Jaradat,

The used pixel CLK:72M

We use PCLK.

This issue can be seen on some system, we had done AB swap yet(A shaking, B not shaking), it follow the UB934

Best Regards.

Hello Yao,

can you provide register dump from a good system and from a bad system?

Hi Jaradat,

Which register dump we should get?UB 934 or UB947?

Best Regards.

You said the error is at the output of 934, and the failure followed the 934 after ABA swap, correct? So I will need a reg dump from the 934.