DS90UH949-Q1: The colors are reversed on the DS90UH949 and DS90UH948.

To explain the symptoms in more detail, RED is displayed in full screen and GREEN, and GREEN is displayed in RED.

Thank you.

Hello Choi,

Please first check that all the lanes from HDMI chip to 949 and 948 to display are ordered correctly. Also please try changing the MAPSEL configuration on 948 to see if the display issue is resolved. 

Best Regards,

Casey 

Hi Casey,

Attached 949 connections. Is it correct to connect HDMI to 949? The 948 board is in mass production now. I need to make it work on that monitor.

Best Regards,

Choi

Choi,

Most of these connections are going off page so the schematic is not too useful. Can you please share the full schematic so we can see connections and strap options?

Thanks,

Casey 

Hi Casey

Strap pin is connected as below.

Is the hdmi connection name correct?

Thanks,

Choi

Hello Choi,

It looks like the HDMI naming is correct and I don't see a problem with the mode straps. Is the HDMI connection AC or DC coupled to the source?

Thanks,

Casey 

Hi Casey,

Directly connected HDMI Transmitter chip and 949 chip without AC or DC couple.

The current problem is described again as shown below.

When R (255), G (0), and B (0) are input, the output shows GREEN.

When R (0), G (255), and B (0) are input, the output shows RED.

When R (0), G (0) and B (255) are input, the output shows BLUE.

If I change the ROUTING of R and G in the input, I can see the normal screen output.

The output of the graphics chip is reversed R and G. So the color of OSD is also reversed.

Thanks,

Choi

Hello Choi,

If there are no AC coupling caps between the 949 and the HDMI source then it should be DC coupled HDMI. For 949 the VTERM voltage controls DC or AC coupled configuration. In your schematic the VTERM pin is connected to 1.8V for AC coupled HDMI. Can you please try connecting it to 3.3V for DC coupled HDMI instead?

The 949 does not take any action to change colors so I think there still may be some connection issue. 

Best Regards,

Casey 

Hi Casey,

I tested it by changing VTERM to 3.3v.

The result is the same as before. I can't understand why this is happening.

Thanks,

Choi

Hello Choi,

Two ideas - I did not see a confirmation from the above if you were able to try changing MAPSEL at the 948. This can be done via the remote back channel through 949 by adjusting 948 register 0x49[6:5]. Please try swapping the MAPSEL to see if it fixes the issue. 

Second, can you confirm the output data format from the HDMI source? Is it RGB888? Is it possible that the source is sending a YUV format instead? 949 needs to receive RGB888 (RGB444 in HDMI terminology), so please check if that is configurable from the HDMI source. 

Best Regards,

Casey 

Hi Casey,

I tested two ideas you told me about.

First, I tested MAPSEL, but it changed but the G and R didn't change and the other colors changed.

Second, the output data format from HDMI source is RGB888. I changed it to the YUV output, but the G and R didn't change as other colors changed.

Best Regards,

Choi

Hello Choi,

I can't think of any other reason for the reversed colors except maybe that the DOUT0 and DOUT1 connections could be reversed going to the 948? Other than that, the 949/948 do not change the colors for the video so I think the problem may be coming from the HDMI source. 

Best Regards,

Casey