BenQ G2450HM User manual

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Applicable Country & Regions: Global
Service Manual for BenQ:
G2450HM: D-SUB + HDMI + DVI + AUDIO
P/N: 9H.L7NLA.TBW
GL2450HM: D-SUB + HDMI + DVI + AUDIO
P/N: 9H.L7CLA.TBE
GL2450HE: D-SUB + HDMI + DVI + AUDIO
P/N: 9H.L7CLA.FBE
Glossy Black Chassis Colors
Product Service Manual – Level 1~2
Version: 2nd
Date:10-31-2012
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 (Sep. 2011)
©Copyright BenQ Corporation 2011. All Right Reserved.

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Content Index
Abbreviations & Acronyms........................................................................................................................................3
1. About this Manual...................................................................................................................................................5
1.1 Important ............................................................................................................................................................5
1.2 Trademark ..........................................................................................................................................................5
2. Introduction.............................................................................................................................................................6
2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS.....................................................6
2.2 Safety Warning and Notice.................................................................................................................................6
2.3 Compliance Statement .......................................................................................................................................7
3. General Description................................................................................................................................................8
4. Related service information...................................................................................................................................8
5. Product Overview ...................................................................................................................................................9
5.1 Monitor Specifications ........................................................................................................................................9
5.2 Panel Inspection Specification..........................................................................................................................21
Level 1 Cosmetic / Appearance / Alignment Service ............................................................................................26
Visual Inspection & Cleaning..................................................................................................................................26
F/W Upgrade SOP..................................................................................................................................................26
Adjustment / Alignment Procedure.........................................................................................................................43
Level 2 Circuit Board and Standard Parts Replacement ......................................................................................58
Product Exploded View ..........................................................................................................................................58
Six Angles’ View .....................................................................................................................................................60
Product Disassembly/Assembly .............................................................................................................................61
Block Diagram ........................................................................................................................................................71
Schematic Diagram ................................................................................................................................................74
Troubleshooting......................................................................................................................................................85
PCB LAYOUT.............................................................................................................................................................91
Appendix 1 – Screw List / Torque ...........................................................................................................................99

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Abbreviations & Acronyms
A
ADC Analog 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 Synchronization
D
DLP Digital Light Processing / Texas Instruments®
DMD Digital Micro mirror Device
DRAM Dynamic RAM
DVI Digital Visual Interface
DVI-D Digital Visual Interface-digital
DVI-I Digital Visual 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 Signal, data transmission system for high
M
MOSFET Metal Oxide Semiconductor Field Effect Transistor
N

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NC Not Connected
NVM Non Volatile Memory: IC containing TV related data (for example, options)
O
OSD On Screen Display
P
PC Personal Computer
PCB Printed Circuit Board (or PWB)
R
RC Remote Control transmitter
RGB Red, Green and Blue. The primary color signals for TV. By mixing levels of R, G
and B, all colors (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= Color 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 color signal.

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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

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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 complaints.
If the product service or maintenance require replacing any parts, please confirming the RoHS requirement before
replace them.
2.2 Safety Warning and Notice
Installation
1. Do not use your monitor under any of the following environmental conditions:
Extremely high or low temperature, or in direct sunlight
Dusty places
Highly humid, exposed to rain, or close to water
Exposed to vibrations or impacts in places such as cars, buses, trains, and other rail vehicles
Near heating appliances such as radiators, heaters, fuel stoves, and other heat-generating items (including
audio amplifiers)
An enclosed place (such as a closet or bookcase) without appropriate ventilation
An uneven or sloping surface
Exposed to chemical substances or smoke
2. Do not block vents and openings by clothes or curtains.
3. Carry the monitor carefully.
4. Do not place the monitor face down on the floor or a desk surface directly. Otherwise, scratches on the panel
surface may occur.
5. Do not place heavy loads on the monitor to avoid possible personal injury or damage to the monitor.
6. Ensure that children do not hang or climb onto the monitor.
7. Keep all packing bags out of reach of children.

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Operation
1. To protect your eyesight, please refer to the user manual to set the optimal screen resolution and the viewing
distance.
2. To reduce eye fatigue, take a break on a regular basis while using the monitor.
Avoid taking either one of the following actions for a long time. Otherwise, burn marks may occur.
Use the monitor in the aspect ratio of 16:9.
Place a still image (such as an OSD menu, fixed text or image) on the screen.
3. To avoid possible damage to the monitor, do not touch the monitor panel by hand, pen, or any other sharp
objects.
4. Excessively frequent plug and unplug of video connectors (D-sub / DVI) may cause damage to the monitor.
5. This monitor is designed mainly for personal use. If you want to use the monitor in a public place or a harsh
environment, contact your nearest BenQ service center for assistance.
6. To avoid possible electric shock, do not dissemble or repair the monitor.
7. If a bad smell or an abnormal sound appears to come from the monitor, contact your nearest BenQ service
center for assistance immediately.
Cleaning
1. Ensure that the power is unplugged before cleaning your monitor
2. Use a monitor cleaner and a soft cloth to clean your monitor.
3. Do not use solvents such as alcohol to clean your monitor.
Power
1. To avoid possible damage to the monitor, do not use it in a region where power supply is unstable.
2. Ensure that the power cord is connected to a grounded power outlet before turning on the monitor.
3. Use only the power cord provided by BenQ.
4. Never use a power cord that appears to be damaged or frayed.
5. To avoid possible danger, observe the total electric load when using the monitor with a (multi-outlet) extension
cord.
6. Always turn off the monitor before unplugging the power cord.
2.3 Compliance Statement
Caution: This Optical Storage Product contains a Laser device. Refer to the product specifications and your local
Laser Safety Compliance Requirements.

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3. General Description
This new LCD (Liquid Crystal Display) monitor BenQ G2450HM&GL2450HM/GL2450HE offers numerous features
and functions, for example:
Panel Type: TN + CCFL (For G2450HM)
Panel Type: TN + LED (For GL2450HM/GL2450HE)
Minimal space requirements thanks to slim casing
Optimum ergonomic characteristics (totally distortion-free, excellent picture definition and color purity right into
the corners)
Contrast ratio 50000:1 (DCR), brightness 300nits (For G2450HM)
Contrast ratio 12 million:1 (DCR), brightness 250nits (For GL2450HM/GL2450HE)
MAX. resolution (1920X1080)
Presentation of up to 16.7 M colors (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 15 different display modes
Freely adjustable color alignment for matching the screen colors to the colors 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
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 VGA connector and 24-pin
DVI-D connector, also supports VESA DPMS power management and plug & play function.
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 16:9. 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
Service Web Site
eSupport URL: http://esupport.benq.com

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5. Product Overview
5.1 Monitor Specifications
G2450HM GL2450HM/GL2450HE
Conf. 2
D-sub (include component source) +
DVI-D + HDMI + speaker
Conf. 3
D-sub (include component source) +
DVI-D + HDMI + speaker
Panel / Display
Panel Type (TN / VA /
IPS) TN + CCFL TN + LED
Panel Size 24"W(16:9) 24"W(16:9)
Display Area 531.36x298.89 531.36x298.89
Max. Resolution 1920X1080 1920X1080
Pixel Pitch 0.276 0.276
Brightness (Typ.) 300 cd/m2250 cd/m2
Contrast Ratio (Typ.)
/ DCR (Min.) 1000:1(Panel)/50000:1 (DCR) 1000:1(Panel)/12M:1 (DCR)
Viewing Angle (H/V),
CR≥10 170/160 170/160
Display Colors 16.7M 16.7M
Response Time 5ms (Tr+Tf) 5ms (Tr+Tf)
GtG response Time 2ms 2ms
MPRT N/A N/A
NTSC ratio 72% 70~72%
Video
BenQ SenseyeTM
Technology Senseye 3 Senseye 3
BenQ SenseyeTM
Preset Modes
6 Modes (by hotkey) : Standard /
Movie / Game / Photo / s-RGB / ECO
6 Modes (by hotkey) : Standard /
Movie / Game / Photo / s-RGB / ECO
Color Temperature
Selection
Normal (6500°K) / Reddish (5800°K) /
Bluish (9300°K) / User Mode
Normal (6500°K) / Reddish (5800°K) /
Bluish (9300°K) / User Mode
AMA (Over Drive ) Yes Yes
Hor. Frequency (kHz) 30-83 30-83
Ver. Frequency (Hz) 50-76 50-76
Video Bandwidth
(MHz) 205 205
Audio Speakers (built-in) 2W x 2 2W x 2
Input/Output PC Video Input D-sub/DVI-D/HDMI D-sub/DVI-D/HDMI

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Audio line in Yes Yes
Earphone Jack Yes Yes
Power Supply
Voltage Rating AC: 100~240V (Built-in) AC: 100~240V (Built-in)
Power-On Mode <35W (max) <35W (max)
Standby Mode <0.3W (max) <0.3W (max)
Power Off Mode <0.3W (max) <0.3W (max)
Mechanical
Design
Chassis Colors
(proposal A) Glossy black, detail refer to artwork Glossy black, detail refer to artwork
Carton Brown Carton with at least C flute (BE
flute CTN for BQjp shipments)
Brown Carton with at least C flute (BE
flute CTN for BQjp shipments)
Power LED Green (ON)/ Amber (Standby) Green (ON)/ Amber (Standby)
Tilt (Up / Down) 15° ~ -5° 15° ~ -5°
VESA Wall Mount 100 x 100 mm 100 x 100 mm
Kensington Lock Yes Yes
Container Loading
(foam cushion 40') >1300 >1300
Container Loading
(foam cushion 20') >650 >650
Multi-language
Support OSD
17 Languages (English / Francais /
Deutsch / Italiano / Espanol / Polish /
Czech / Hungarian / Serbo-croatian /
Romanian / Netherlands / Russian /
Swedish / Portuguese / Japanese /
Chinese / S-Chinese)
17 Languages (English / Francais /
Deutsch / Italiano / Espanol / Polish /
Czech / Hungarian / Serbo-croatian /
Romanian / Netherlands / Russian /
Swedish / Portuguese / Japanese /
Chinese / S-Chinese)
Other feature
Vista Premium Premium
Win 7 Yes Yes
Dynamic Power
Saving (DPS) Yes Yes
Accessories Refer to SKU list Refer to SKU list
Regulation
Approvals
Refer to the worksheet
"RFQ-Regulatory"
Refer to the worksheet
"RFQ-Regulatory"