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Q.

Monitor shows incorrect color and non-smooth tone when connecting Mac via HDMI cable.

 

A.

When connecting Mac via HDMI cable, the monitor may show incorrect color and non-smooth tone.
 
In details, phenomena occurs such as:
 - High tone/low tone cannot be displayed correctly
 - Middle tones are skipped.
When these occur, we recommend using alternative ways than HDMI connection.
 
- Cause
Mac does not output full range, RGB signal but limited range, YUV signal from the HDMI port. 
This is an intended behavior of Mac. 
 
- Measures
1. Use alternative connection than HDMI.
 
    When Mac has following output connectors, please use these connectors.
   - Thunderbolt 3 (USB Type-C)
   - Thunderbolt 2 (Mini DisplayPort)
   - DVI
 
2. Change the monitor settings (ColorEdge monitor only)
 
    You can avoid this HDMI issue with the following "Signal Format" setting.
 
     For CG277 / CG247 / CG247X / CX271 / CX241 / CS270 / CS240
      Optional Settings -> Signal Selection -> Signal Format -> HDMI
      Change the setting from "Video" to "PC"
 
     For CG2730 / CG2420 / CS2740 / CS2731 / CS2730 / CS2420 / CS2410
      Administrator Settings -> Signal Format -> HDMI
      Change the setting from "Video" or "4K 60Hz / YUV" to "RGB" or "4K 60Hz"
 
    Please refer to the user's manual for detailed procedure.

 

▼ Model:CX240 FAQ ranking

No. Question Category Date
1 FlexScan
ColorEdge
FORIS
January 20, 2015
2 FlexScan
ColorEdge
FORIS
April 6, 2020
3 FlexScan
ColorEdge
FORIS
January 5, 2015
4 FlexScan
ColorEdge
FORIS
July 31, 2020
5 FlexScan
ColorEdge
FORIS
March 10, 2016
6 ColorEdge
June 3, 2013
7 FlexScan
ColorEdge
July 31, 2020
8 ColorEdge
February 21, 2019
9 ColorEdge
March 22, 2019
10 ColorEdge
11 ColorEdge
May 1, 2015
12 ColorEdge
April 6, 2016
13 ColorEdge
June 4, 2013
14 ColorEdge
15 ColorEdge
16 ColorEdge
17 ColorEdge
18 ColorEdge
September 20, 2013
19 ColorEdge
20 ColorEdge

 

▼ Model:CX240 Latest updates

No. Question Category Date
1 FlexScan
ColorEdge
July 31, 2020
2 FlexScan
ColorEdge
FORIS
April 6, 2020
3 ColorEdge
March 22, 2019
4 ColorEdge
February 21, 2019
5 ColorEdge
April 6, 2016
6 FlexScan
ColorEdge
FORIS
March 10, 2016
7 ColorEdge
May 1, 2015
8 FlexScan
ColorEdge
FORIS
January 20, 2015
9 FlexScan
ColorEdge
FORIS
January 5, 2015
10 ColorEdge
June 4, 2013
11 ColorEdge
June 3, 2013
12 FlexScan
ColorEdge
FORIS
July 31, 2020
13 ColorEdge
September 20, 2013
14 ColorEdge
15 ColorEdge
16 ColorEdge
17 ColorEdge
18 ColorEdge
19 ColorEdge
20 ColorEdge