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SN75DP159: SN75DP159 can not show imaging in 4k monitor but can show imaging in 2k monitor.

Part Number: SN75DP159

Hi, David

 Hope you are doing great!

 my customer use SN75DP159 in their project and they transfer imaging data from FPGA to external monitor by SN75DP159. they said they could not see any imaging if the terminal is a 4k monitor and they can see imaging if the terminal is a 2k monitor screen. below is customer schematic, register configure and testing result. 

   seems it is a layout related issue since customer can see imaging in 2k monitor screen. could we can adjust or re-configure register to help customer to solve the issue for 4k monitor screen?

thank you very much!