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19" LCD Color Monitor HP L1940T

Table of Contents

Table of Contents -------------------------------------------------------------------------------------------------------------------------02

Revision List -------------------------------------------------------------------------------------------------------------------------------03

1. Monitor Specification -----------------------------------------------------------------------------------------------------------------04

2. LCD Monitor Description --------------------------------------------------------------------------------------------------------------05

3. Operation Instructions -----------------------------------------------------------------------------------------------------------------06

3.1 General Instructions ---------------------------------------------------------------------------------------------------------------06

3.2 Control Button ---------------------------------------------------------------------------------------------------------------------06

3.3 Adjusting The Picture ----------------------------------------------------------------------------------------------------------------07

4. Input/Output Specification -------------------------------------------------------------------------------------------------------- 09

4.1 Input Signal Connector -----------------------------------------------------------------------------------------------------------09

4.2 Factory Preset Display Modes --------------------------------------------------------------------------------------------------11

4.3 Power Supply Requirements ----------------------------------------------------------------------------------------------------11

5. Panel Specification --------------------------------------------------------------------------------------------------------------------12

5.1 General Feature --------------------------------------------------------------------------------------------------------------------12

5.2 Optical Characteristics ------------------------------------------------------------------------------------------------------------13

6. Monitor Exploded View -----------------------------------------------------------------------------------------------------------------14

7. Block Diagram -----------------------------------------------------------------------------------------------------------------------15

8. Maintainability -----------------------------------------------------------------------------------------------------------------------------17

9. Schematic --------------------------------------------------------------------------------------------------------------------------------24

9.1 Main Board -------------------------------------------------------------------------------------------------------------------------24

9.2 Inverter/Power Board ---------------------------------------------------------------------------------------------------------29

10. PCB Layout -----------------------------------------------------------------------------------------------------------------------------31

10.1 Main Board -------------------------------------------------------------------------------------------------------------------------31

10.2 Inverter/Power Board ------------------------------------------------------------------------------------------------------------32

10.3 Key Board --------------------------------------------------------------------------------------------------------------------------32

11. White-Balance, Luminance Adjustment ------------------------------------------------------------------------------------ 33

12. EDID Content --------------------------------------------------------------------------------------------------------------------------36

13. BOM List --------------------------------------------------------------------------------------------------------------------------------37

14. Different Parts List---------------------------------------------------------------------------------------------------------------------

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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