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Original question:

TMDS181: HDMI 4k video in source mode setup

TMDS181: No output

Gabriel Wang1
Genius 4375 points
Part Number: TMDS181

Dear Sir

We're doing a stress test. The relay was used to realize 5S hot swap, but no output signal was found. It is checked that HPD_SRC has input 3.3V signal, but HPD_SNK has no output 3.3V signal. The HDMI connection cannot detect a port connection signal.
What is the reason?

Below is our Sch,pls check !

芯片原理图.pdf

  • 0
    TI__Guru**** 156181 points

    Hi,

    HPD_SNK, pin 33 is an input, not an output. Is R10 populated? If you see HPD_SRC 3.3V, it looks like the HPD is driven correctly.

    Looking at the schematic, since this is a sink side application, the pullup on the DDC bus needs to be 47k, not 1.8k.

    Thanks

    David