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SN65DP159: No SCL_SINK

Part Number: SN65DP159

I am debugging a new board with a SN65DP159 for HDMI application.  I2C_EN is tied high, but with no I2C master connected I am expecting default configuration to work initially.  OE is tied high.

On power up, I get a good SCL_SOURCE clock, but see no activity on the SCL_SINK pin.   SCL_SINK is tied to a 5V pull-up.  Any suggestions for further debug?