TMDS181: HDMI 4K did not display after multiple plugging and unplugging, and 4K did not display after waking up from sleep.

Rannie Zhou

Part Number: TMDS181

Tool/software:

Hi David,

Per talked, please help to give some debug direction asap, there are 3 key projects share the same base board that using TMDS181, this issue has blocked the progress of customer project. As this board is in TI Lab, can we try to reproduce in TI Lab? Thanks!

The issue behavior:

HDMI 4K did not display after multiple plugging and unplugging, and 4K did not display after waking up from sleep.

The sch:8546.HDMI Re-timer 线路12.24.pdf Also, modified the Vsadj, choke selection, EQ_SEL like we recommend.

The HPD_SRC, HPD, 3.3V, 1.8V when the abnormality occurred:

HPD:

Sleep HPD:

Sleep wake:

BRs,

Rannie

5 months ago

0 David (ASIC) Liu 5 months ago

TI__Guru**** 178126 points

Rannie

Does this issue open happen with 4k@60Hz or any other resolutions?

Can you please also ask the customer to probe the DDC bus?

Can you also probe the clock frequency?

Can you also check the TMDS181 TMDS_CLOCK_RATIO_STATUS bit, do you see it set to 1 when the abnormality happens?

Thanks

David

+1 David (ASIC) Liu 3 months ago in reply to David (ASIC) Liu

TI__Guru**** 178126 points

Hi,

I will go ahead and close this thread since there is no response. You can either respond to this thread to re-open it or create a new thread if you need continue support.

Thanks

David

0 Rannie Zhou 3 months ago in reply to David (ASIC) Liu

TI__Expert 4220 points

Hi David,

Thanks for your kindly and patience support. This issue has been solved in customer side. Now they introduce this solution in most projects/platform.

BRs,

Rannie

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TMDS181: HDMI 4K did not display after multiple plugging and unplugging, and 4K did not display after waking up from sleep.