DS90UB947-Q1: CPU +DS90UB947-Q1 + DS90UB948-Q1 + panel ，display not ok

what is your issue? pls elaborate it. is it the processor video output problem?
for pattern gen. test, is it the UB947's internal pattern? the timing is from external or internal?


best regards,
Steven

hi Steven,
for pattern gen. test display ok, it is the UB947's internal pattern ，and internal clock.
when normal display,there is some colour bars which are not expected are showing on the screen,like the the pciture i attched .
i have tryed 1-lane FPD-Link III Input, Dual Link OpenLDI Output mode,and 2-lane FPD-Link III Input, Dual Link OpenLDI Output mode,but it does fix my issue.
I used DS90UB927Q-Q1 to light panel before,so i think the processor video output is ok.

thanks.

updata this line:
i have tryed 1-lane FPD-Link III Input, Dual Link OpenLDI Output mode,and 2-lane FPD-Link III Input, Dual Link OpenLDI Output mode,but it does
not fix my issue.

Have you follow up UB947/UB948 design spec. and design guide line? please use the external timing to test the pattern gen., is it ok?

regards,
Steven

Dear Steven,

         I  use the  external timing&pattern gen. data to test by set reg ds947_write_reg(client,0x65,0x04) ====》ds947_write_reg(client,0x65,0x00)，

and the pattern gen.  starts to show unexpected colour bars now,like the picture below

Dear Steven,
We did follow up UB947/UB948 design spec. and design guide line,our hardware engineer design this pcba at an other company berfore.

Please check the I/f between processor and UB947 input port. the video input to UB947 could have some problem since the external timing would cause the display panel abnormal.
anyway, please double confirm the design.

best regards,
Steven