It is very strange, I have made several CX3 boards, all of them use same image sensor board. but only one of them shows video with big noise, others work fine.
I set this image sensor in Color bar mode, the picture also shows noise, it means this specific CX3 board may be the root cause for this niose, becase the sensor shows static color bar continuously.
Can anybody give some advice?
Can you please probe HSYNC_test, VSYNC_test pins on working and noise board, compare the both?
Please enable the debug prints and check whether the prints are same.