HP L1940T Service Manual

19" LCD Color Monitor HP L1940T
33
11. White-Balance, Luminance Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment.
1. How to do the Chroma-7120 MEM .Channel setting
A. Reference to chroma 7120 user guide
B. Use “ SC” key and “ NEXT” key to modify xyY value and use “ID” key to modify the
TEXT description Following is the procedure to do white-balance adjust
2. Setting the color temp. You want
A. 9300 color:
9300 color temp. parameter is x = 283 ±20, y = 297 ±20, Y = 180 cd/m
2 ,
B. 6500K color:
6500K color temp. parameter is x = 313±20, y = 329 ±20, Y= 180 cd/m
2
)
C. sRGB color:
sRGB color temp. parameter is x = 313±20, y = 329 ±20, Y= 150 cd/m
2
)
3. Into factory mode of HP L1940T
Turn off the monitor. then press AUTO button and MENU button and hold them at the same time, then press power
on, then press Menu button, wait until the OSD menu with Characters “F” come on the Screen of the monitor.
4. Bias adjustment:
Set the Contrast
to 80
Adjust the Brightness
to 90.
5. Gain adjustment :
Move cursor to “-F-” and press MENU key
A. Adjust 9300k color-temperature
1. Switch the Chroma-7120 to 9300k channel.
2. The chroma 7120 will show x = 283±20, y = 297 ±20, Y= 180 cd/m
2
3. Switch the chroma-720 to RGB MODE (with press “MODE” button to change )
4. Adjust the RED of color 9300K on factory window until chroma 7120 indicator reached
the value R=100
5. Adjust the GREEN of color 9300K on factory window until chroma 7120 indicator reached
the value G=100
6. Adjust the BLUE of color 9300K on factory window until chroma 7120 indicator reached
the value B=100
7. Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the
tolerance =100±2
B. Adjust 6500K color-temperature
1. Switch the chroma-7120 to 6500K channel.

HP L1940T Specifications

General

3D	No
Pixel pitch	0.294 x 0.294 mm
Aspect ratio	5:4
Response time	8 ms
Display diagonal	19 \
Display resolution	1280 x 1024 pixels
Vertical scan range	56 - 76 Hz
Horizontal scan range	30 - 83 kHz
Viewing angle, vertical	135 °
Contrast ratio (dynamic)	-
Contrast ratio (typical)	700:1
Display number of colors	16.78 million colors
Viewing angle, horizontal	140 °
Display brightness (typical)	300 cd/m²
Supported graphics resolutions	1280 x 1024 (SXGA)
On/off switch	Yes
USB hub version	2.0
DVI-I ports quantity	0
USB Type-A downstream ports quantity	2
Pivot angle	0 - 90 °
Tilt angle range	-5 - 35 °
Panel mounting interface	100 x 100 mm
AC input voltage	95 - 265 V
AC input frequency	50 - 60 Hz
Power consumption (max)	60 W
Power consumption (average)	33 W
Power consumption (standby)	2 W
Power consumption (typical)	40 W
Operating temperature (T-T)	5 - 35 °C
Storage relative humidity (H-H)	5 - 90 %
Operating relative humidity (H-H)	20 - 80 %
Package depth	241 mm
Package width	508 mm
Package height	521 mm
Package weight	10200 g
Sustainability certificates	ENERGY STAR
Certification	CSA, CE, CISPR, FCC, ISO, TCO, VCCI, TUV, MPR-II
Country of origin	China

Weight and Dimensions

Depth (without stand)	273 mm
Width (without stand)	413 mm
Height (without stand)	362 mm
Weight (without stand)	8400 g