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HP L1940T




SERVICE MANUAL

19" LCD Monitor
L1940T Series




THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE
EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE
ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR
CHANGES, ERRORS OR OMISSIONS.


1
HP L1940T


Table of Contents
Table of Contents ------------------------------------------------------------------------------------------------------------------------ 02
Revision List ------------------------------------------------------------------------------------------------------------------------------ 03
1.Monitor Specification ----------------------------------------------------------------------------------------------------------------04
2.LCD Monitor Description ------------------------------------------------------------------------------------------------------------05
3.Operation Instructions ---------------------------------------------------------------------------------------------------------------05
3.1 General Instructions ---------------------------------------------------------------------------------------------------------------05
3.2 Control Button ---------------------------------------------------------------------------------------------------------------------06
3.3 Adjusting The Picture --------------------------------------------------------------------------------------------------------------06
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.Repair Flow Chart ---------------------------------------------------------------------------------------------------------------------15
8. Trouble Shooting -------------------------------------------------------------------------------------------------------------------18
9. Block Diagram --------------------------------------------------------------------------------------------------------------------19
10. Schematic ------------------------------------------------------------------------------------------------------------------------------20
10.1Main Board ----------------------------------------------------------------------------------------------------------------------20
10.2 Inverter/Power Board -------------------------------------------------------------------------------------------------------25
10.3 Key Board ------------------------------------------------------------------------------------------------------------------29
11. PCB Layout -----------------------------------------------------------------------------------------------------------------------------31
11.1 Main Board --------------------------------------------------------------------------------------------------------------------------31
11.2 Inverter/Power Board -------------------------------------------------------------------------------------------------------------32
11.3 Key Board ---------------------------------------------------------------------------------------------------------------------------33
12. Maintainability -------------------------------------------------------------------------------------------------------------------------34
13. White-Balance, Luminance Adjustment ------------------------------------------------------------------------------------ 35
14. Check List after replacing LCD Main board ---------------------------------------------------------------------------------37
14.1 Check white-balance -------------------------------------------------------------------------------------------------------------37
14.2 Steps for writing DDC ------------------------------------------------------------------------------------------------------------37

15. EDID Content --------------------------------------------------------------------------------------------------------------------------52

16. BOM List --------------------------------------------------------------------------------------------------------------------------5364



2
HP L1940T

Revision List
Revision Date Revision History TPV Model
A00 Feb.-24-06 Initial release T981KMVDBHHPNP




3
HP L1940T
1.Monitor Specifications
Driving system TFT Color LCD

Panel M190E5-L0A

Active Area 376.32(H) x 301.056(V) (19.0")

Pixel pitch 0.294( H )x 0.294mm( V )

LCD Panel Viewing Angles(Min / TYP) H:120/140; V:110/130

Response time (typ.) < 8 ms

Brightness 200 nits

Contrast 450:1

Video Analog /Digital

Sync. Type H/V TTL
Input
H-Frequency 30kHz