The HDMI port does not work on the own designed carrier board

No AC capacitance is added to this circuit,The test found that the TMDS channel was not pulled up to 3.3v。 I measured 480mHz:

How to solve this problem?

It looks that your design is different to reference. Please check the HDMI design guideline in Product Design Guide and reference schematic of P3509 in DLC to eliminate the difference first.

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