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DS90UB925Q-Q1: The screen goes out after about 1 second

TS Yang
Genius 4800 points
Part Number: DS90UB925Q-Q1

Hi,

The chip under development is the DS90UB925QSQ, and I am trying to insert an external video input source into a monitor with DS90UB926QSQ, which SERDES thinks is PAIR.

The hardware configuration is complete, and the screen of the product is displayed normally when connected, but there is a symptom that the backlight is turned off by itself for about 1 second.
The monitor is 800x480 resolution, so it does not seem to be a screen problem. I am not sure whether the UH925 is a chip specification difference between the currently selected UB925 and another specification, especially HDCP.
I would be very grateful if you could help me with the above.
We attach our video block circuit and the current display is UB926.
NV1-06_925_회로도.pdf
thanks,
TS