BenQ M2400HD - 24" LCD Monitor User manual

1
Applicable Country & Regions: Europe/China
Service Manual for BenQ:
LCD E2400HD
(D-SUB+DVI-D+HDMI1.3
+ Black Bezel)
Product Service Manual – Level 1~2
Version: 1st
Date:07-08-2008
Notice:
For RO to input specific “Legal Requirement” in specific NS regarding to responsibility and
liability statements.
Please check BenQ’s eSupport web site, http://esupport.benq.com, to ensure that you have the
most recent version of this manual.
First Edition (August, 2008)
©Copyright BenQ Corporation 2008. All Right Reserved.

24” LCD Color Monitor BenQ E2400HD
2
Content Index
Abbreviations & Acronyms........................................................................................................................................3
1. About This Manual..................................................................................................................................................5
1.1 Important ............................................................................................................................................................5
1.2 Trademark...........................................................................................................................................................5
2. Introduction.............................................................................................................................................................5
2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS.....................................................5
2.2 Safety Notice ......................................................................................................................................................6
2.3 Compliance Statement .......................................................................................................................................6
3. General Description................................................................................................................................................6
4. Related service information...................................................................................................................................7
5. Product Overview ...................................................................................................................................................8
5.1 Monitor Specifications ........................................................................................................................................8
5.2 Packing...............................................................................................................................................................9
Level 1 Cosmetic / Appearance / Alignment Service ..............................................................................................9
Level 1 Cosmetic / Appearance / Alignment Service ............................................................................................10
Level 1 Cosmetic / Appearance / Alignment Service ............................................................................................11
Level 1 Cosmetic / Appearance / Alignment Service ............................................................................................12
Visual Inspection & Cleaning..................................................................................................................................12
Software/Firmware Upgrade Process ....................................................................................................................12
Adjustment / Alignment Procedure .........................................................................................................................20
Level 2 Circuit Board and Standard Parts Replacement ......................................................................................31
Product Exploded View ..........................................................................................................................................31
Six angles’ view ......................................................................................................................................................31
Product Disassembly..............................................................................................................................................32
Block Diagram ........................................................................................................................................................35
Schematic Diagram ................................................................................................................................................37
Troubleshooting Guide ...........................................................................................................................................46
PCB LAYOUT .........................................................................................................................................................53
Appendix – Screw List / Torque ..............................................................................................................................56

24” LCD Color Monitor BenQ E2400HD
3
Abbreviations & Acronyms
A
ADC Analogue to Digital Converter
AFC Automatic Frequency Control: control signal used to tune to the correct frequency
B
BenQ BenQ Corporation
BTSC Broadcast Television System Committee
C
CPU Central Process Unit
CVBS Composite Video Blanking and Synchronisation
D
DLP Digital Light Processing / Texas Instruments®
DMD Digital Micromirror Device
DRAM Dynamic RAM
DVI Digital Video Interface
DVI-I Digital Video Interface-Integrated
E
EEPROM Electrically Erasable and Programmable Read Only Memory
F
FLASH FLASH memory
G
G-TXT Green Teletext
H
HDMI High Definition Multimedia Interface, digital audio and video interface
HP Head Phone
I
I2C Integrated IC bus
L
LED Light Emitting Diode
LVDS Low Voltage Differential Signalling, data transmission system for high
M
MOSFET Metal Oxide Semiconductor Field Effect Transistor
N
NC Not Connected
NVM Non Volatile Memory: IC containing TV related data (for example, options)
O
OSD On Screen Display

24” LCD Color Monitor BenQ E2400HD
4
P
PC Personal Computer
PCB Printed Circuit Board (or PWB)
R
RC Remote Control transmitter
RGB Red, Green, and Blue. The primary colour signals for TV. By mixing levels of R, G, and B,
all colours (Y/C) are
ROM Read Only Memory
S
SDA Data signal on I2C bus
SDRAM Synchronous DRAM
SW Sub Woofer / Software
T
THD Total Harmonic Distortion
V
VGA Video Graphics Array
Y
YPbPr Component video (Y= Luminance, Pb/ Pr= Colour difference signals B-Y and R-Y, other
amplitudes w.r.t. to YUV)
Y/C Video related signals: Y consists of luminance signal, blanking level and sync; C consists
of colour signal.

24” LCD Color Monitor BenQ E2400HD
5
1. About This Manual
The purpose of Service Manual is to provide a guide line to engineers to repair different models. The
appearance and capability is introduced in this Service Manual. It is better for repair engineer to have a rough
idea of this model through reading the Service Manual. Please do pay attention to the item part of the
disassembly when repair the machine and also do the protection of panel any time. When repairing the circuit
board, please follow the requirement of RoHS and refer to the circuit diagram and repairing process that
attached in the Service Manual. The method of firmware updated, the way of using the menu and some
information that may be used when repairing are also attached in the Service Manual that provide repair
engineer various choice.
1.1 Important
Only trained service personnel who are familiar with this BenQ Product shall perform service or
maintenance to it. Before performing any maintenance or service, the engineer MUST read the
“Important Safety Information”.
1.2 Trademark
2. Introduction
This section contains general service information, please read through carefully. It should be stored for easy
access place.
2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS.
The RoHS (Restriction of Hazardous Substance in Electrical and Electronic Equipment Directive) is a legal
requirement by EU (European Union) for the global electronics industry which sold in EU and some counties
also require this requirement. Any electrical and electronics products launched in the market after June 2006
should meet this RoHS requirements. Products launched in the market before June 2006 are not required to
compliant with RoHS parts. If the original parts are not RoHS complaints, the replacement parts can be non
ROHS complaints, but if the original parts are RoHS compliant, the replacement parts MUST be RoHS

24” LCD Color Monitor BenQ E2400HD
6
complaints.
If the product service or maintenance require replacing any parts, please confirming the RoHS requirement
before replace them.
2.2 Safety Notice
1. Make sure your working environment is dry and clean, and meets all government safety requirements.
2. Ensure that other persons are safe while you are servicing the product.
3. DO NOT perform any action that may cause a hazard to the customer or make the product unsafe.
4. Use proper safety devices to ensure your personal safety.
5. Always use approved tools and test equipment for servicing.
6. Never assume the product’s power is disconnected from the mains power supply. Check that it is
disconnected before opening the product’s cabinet.
7. Modules containing electrical components are sensitive to electrostatic discharge (ESD). Follow ESD safety
procedures while handling these parts.
8. Some products contain more than one battery. Do not disassemble any battery, or expose it to high
temperatures such as throwing into fire, or it may explode.
9. Refer to government requirements for battery recycling or disposal.
2.3 Compliance Statement
1. Caution: This Optical Storage Product contains a Laser device. Refer to the product specifications and your
local Laser Safety Compliance Requirements.
3. General Description
This new LCD (Liquid Crystal Display) monitor BenQ E2400HD offers numerous features and functions, for
example:
●TFT display (Thin Film Transistor; active matrix)
●minimal space requirements thanks to slim casing
●optimum ergonomic characteristics (totally distortion-free, excellent picture definition and colour purity right into
the corners)
●high degree of brightness and good contrast

24” LCD Color Monitor BenQ E2400HD
7
●high resolution (1920x1080)
●presentation of up to 16.7 million colours (in conjunction with an appropriate graphics card)
●automatic scanning of horizontal frequencies from 30 to 83 kHz and refresh rates (vertical frequencies) from 50 to
76 Hz (absolutely flicker-free)
●digital screen controller with microprocessor for storing 21 different display modes
●freely adjustable colour alignment for matching the screen colours to the colours of various input and output devices
●convenient operation via integrated OSD (On-Screen-display) menu
●VESA-DDC compatibility
●plug&play capability
●power management for reducing power consumption when the computer is not in use
●compliance with the recommendations in accordance with TCO’03
This operating manual contains important information you require to start up and run your LCD monitor.
This specification defines the requirements for the 24” MICROPROCESSOR based Multi-mode supported high
resolution color LCD monitor. This monitor can be directly connected to general 15-pin D-sub VGA connector, 24-pin
DVI connector and 19-pin HDMI connector, also supports VESA DPMS power management and plug & play function.
There is a build-in stereo audio amplifier with OSD control to drive a pair of speakers.
Additional information
Due to the nature of liquid crystal display (LCD) technology, the picture resolution is always fixed. For the best
display performance, please set the display resolution to 1920x1080 pixels with an aspect ratio of 16:10. This is
called “Native Resolution” or maximal resolution – that is, the clearest picture. Lower resolutions are displayed on a
full screen through an interpolation circuit. Image blurring across pixel boundaries can occur with the interpolated
resolution depending upon the image type and its initial resolution.
4. Related service information
This Service Manual contains general information. There are 2 levels of service:
Level 1: Cosmetic / Appearance / Alignment Service
Level 2: Circuit Board or Standard Parts Replacement

24” LCD Color Monitor BenQ E2400HD
8
Service Web Site
eSupport URL:http://esupport.benq.com
5. Product Overview
5.1 Monitor Specifications
Panel Type TN
Size 24"
Pixel pitch 0.277mm(H) × 0.277mm(V)
Display Area
Viewable angle 170, 160 (CR>10)
Contrast 1000:1
Dynamic contrast
ratio 10000: 1 (typical)
Brightness 300 cd/m2
LCD Panel
Response time 5ms(typical)
2 ms (GTG)
Video
RGB analog 0.7 Vpp/75 Ohm positive
Digital: DVI-D, HDMI
Synchronization TTL separate signal connection 15-pin mini D-sub cable
H-Frequency 30 - 83 kHz Multi- frequency monitor
Input
V-Frequency 50 - 76 Hz modes within these parameters
Display Colors 16.7M Colors
Image diagnostics Digital, OSD Technology, AUTO key (automatic image setting)
Controls 5 buttons and AUTO key
Max. Resolution 1920 x 1080
Power management VESA DPMS, EPA
Max. power
consumption
57W (max)
EPA ENERGY
STAR®
saving mode < 2 Watt
Speaker(power consumption) 1 Watt x 2
Operating voltage Automatic switched mode power supply, 100-240 V, 50-60 HZ
Environmental
Considerations
Operating Temp: 0° to 35°C
Operating Humidity: 10% to 85%
Dimension (H x W x D) 365.5mm x 582.6mm x 197.4mm
Weight (N. W.) 7 KG
531.36 (H) x 298.89 (V)

24” LCD Color Monitor BenQ E2400HD
9
5.2 Packing
When packing the monitor into the carton, please follow the pictures as below.
Using the EPE bag to pack the monitor without base.
Putting the base into the PE bag

24” LCD Color Monitor BenQ E2400HD
10
Using the EPS to pack the monitor
Putting the base and user manual in the position as the picture shows above.

24” LCD Color Monitor BenQ E2400HD
11
Putting the monitor and accessories into the carton.
Power cord, Signal cable,
Audio cable

24” LCD Color Monitor BenQ E2400HD
12
Level 1 Cosmetic / Appearance / Alignment Service
Visual Inspection & Cleaning
• Cleaning. Always unplug your monitor from the wall outlet before cleaning. Clean the LCD monitor surface with a
lint-free, non-abrasive cloth. Avoid using any liquid, aerosol or glass cleaners.
• Slots and openings on the back or top of the cabinet are for ventilation. They must not be blocked or covered. Your
monitor should never be placed near or over a radiator or heat source, or in a built-in installation unless proper
ventilation is provided.
• Never push objects or spill liquid of any kind into this product.
Software/Firmware Upgrade Process
1. When do the part, need the tools as follow:
a. An i486 (or above) personal computer or compatible.
b. Microsoft operation system Windows 95/98/2000/XP.
c. “ PORT95NT.exe” program
d. Software ISP SN Alignment kits
The kit contents:
a. ISP BOARD x1
b. Printer cablex1
c. VGA cable x1
2. Install the “PORT95NT.EXE”, and restart the computer.
You must install the at the first. The processing as follows:

24” LCD Color Monitor BenQ E2400HD
13

24” LCD Color Monitor BenQ E2400HD
14

24” LCD Color Monitor BenQ E2400HD
15

24” LCD Color Monitor BenQ E2400HD
16
Click to complete the installation.
Note: After installation, you must restart the PC to take the setup to effect.

24” LCD Color Monitor BenQ E2400HD
17
3. Connect the ISP board as follow:
4. The process of ISP write is as follows.
a. Double-click ，running the program as follows:
Connect to
the PC LPT
Connect to the
BenQ model

24” LCD Color Monitor BenQ E2400HD
18
b. Click icon, running the program as follows:
c. Click icon, load the program”E2400W-TSUMU88EDI-M240HW01-V0x-20080801_V027_B15B.BIN”

24” LCD Color Monitor BenQ E2400HD
19
d. Click icon, it will auto run. If burn in success, it will show as the follow picture:

24” LCD Color Monitor BenQ E2400HD
20
Adjustment / Alignment Procedure
Adjusting the Picture
You can use the OSD (On Screen Display) menu to adjust all the settings on your monitor.
Press the MENU key to display the following main OSD menu.
There are four main OSD menus:
1. Display
2. Picture
3. Picture Advanced
4. Audio
5. System
Use the or keys to highlight a menu item, and press the ENTER key to enter the Menu item settings.