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TPD12S016: 5V_OUT pin stays off

Part Number: TPD12S016

Hi

In the datasheet on page 14 it says that

CT_HPD control enables the detection scheme (5V_OUT and HPD) to be active before enabling the HDMI link

I don't seem to get a 5V_OUT by pulling the pin up to Vcca (3.3V) 

Am I understanding it correctly?  I've tried connecting a hdmi cable to my PCB which didn't work and this is the first

problem I'm looking at.

Thank you.