This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMDS181RGZEVM: device stops operating at power cycle

Part Number: TMDS181RGZEVM
Other Parts Discussed in Thread: TMDS181

The setup runs 4K video:

DP source -> DP-HDMI Adaptor -> 181 Eval -> HDMI Sink MNA

The system runs correctly from power up.

Here are the details of the failure

  1. When we cycle power to the 181 Eval the video blanks and will not recover
  2. We get an IIC error of TMDS_Scrambler_Status = N
  3. When we disconnect and reconnect the HDMI source cable to the 181 Eval, it starts working
  4. Same failure mode with DP-HDMI Adaptors from other vendors
  5. Failure also happens when we cycle power to the 181 Eval and the HDMI Sink MNA
  6. Failure does not happen when we remove the 181 Eval  from the system and just cycle power to HDMI Sink MNA 
  7. Failure does not happen when we replace the HDMI Sink MNA with a 4K monitor
  8. Failure does not happen when we remove the DP-HDMI Adaptor and have a HDMI source

Here are the jumper setting on the Eval board:

                J1 2-3

                J6 1-2

                J4 1-2

                J3 open

                J12 open

                J11 open

                J17 open

                J15 open

                J7 open

                J8 1-2

                J14 open

Any suggestions to debug the issue?

Thank you!