BenQ G2220HD - 21.5" LCD Monitor, Service Manual, Page: 16 / 47

16
Contrast
Check
1. Set input mode to 1920×1080@60Hz
2. Set Pattern to 32 gray shades
3. Set brightness/contrast to the max. The brightest 4~8 shades brightness
cannot be distinguished.
Chroma
Signal Generator
Color
Temperature
1. Do “Auto Color Balance” at 1920×1080@60Hz, 32gray shades
2. Measure color temperature, check it complies with the
following temperature :
5800K x=0.326 +/- 0.02, y = 0.342+/-0.02
6500K x = 0.313 +/- 0.02, y = 0.329+/-0.02
9300K x = 0.283 +/- 0.02, y = 0.297+/-0.02
Chroma Signal Generator
and color analyzer
Modes
switching
check
1. Use Chroma Pattern Generator to make sequence.
VESA (640x480 800x600 1024x768 1440x900 1920x1080),
And power saving signal,etc.
2. Confirm the above timing modes must be full screen and
the picture must be normal.
Chroma
Signal Generator
VGA cable
detector
When VGA cable is not plugged, the monitor will work in power saving
mode.
Visual check
Chroma Signal Generator
Panel Flicker
check
1. Mode: 1920×1080@60Hz
2. Set Brightness& contrast to default value
3. Do “Auto Adjustment”
4. Shut down PC to check whether there’s glitter on the center
of the picture.
Chroma signal generator
& PC
Power saving 1.Mode: 1920×1080@60Hz
2. Pattern: full white
3. Brightness: Max.
4. Contrast: Default
at each mode
Chroma signal generator
Status H-sync V-sync Video Power LED
Power On on on active ≤ 48W Green
off on blanked < 2W Amber+blue
on off blanked < 2W Amber+blue
Power Saving
off off blanked < 2W Amber+blue