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DS90UH927Q-Q1: The white spots issue about 927

Part Number: DS90UH927Q-Q1

Hi expert:

My customer use 927&928, there are some white spots appear on the screen when it is turned on. But there was no problem when they used 927&926.

They use STM32 at the screen end. We adjusted the PDB signal timing which is controled by a processor, and the result is better, but not completely resolved.

The test video is attached.Please help to check the attachedsch and code about 927.

Any Suggestions are appreciated