BenQ GL2040 User manual

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Applicable Country & Regions: Australia & Taiwan & EU
Service Manual for BenQ:
GL2040: D-SUB + DVI-D
P/N: 9H.L6FLA.TBW
GL2040M: D-SUB + DVI-D+AUDIO
P/N:9H.L5XLA.TBE(ForEU)
9H.L5XLA.TBT (For Australia)
Glossy Black Chassis Colors
Product Service Manual – Level 1~2
Version: 1st
Date:05-12-2011
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 (May. 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..........................................................................................................................14
Level 1 Cosmetic / Appearance / Alignment Service ............................................................................................17
Visual Inspection & Cleaning..................................................................................................................................17
F/W Upgrade SOP..................................................................................................................................................17
Adjustment / Alignment Procedure.........................................................................................................................34
Level 2 Circuit Board and Standard Parts Replacement ......................................................................................54
Product Exploded View ..........................................................................................................................................54
Six Angles’ View .....................................................................................................................................................56
Product Disassembly/Assembly .............................................................................................................................57
Block Diagram ........................................................................................................................................................65
Schematic Diagram ................................................................................................................................................67
Troubleshooting......................................................................................................................................................75
PCB LAYOUT.............................................................................................................................................................81
Appendix 1 – Screw List / Torque ...........................................................................................................................89

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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 or 16:10.
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 GL2040&GL2040M offers numerous features and functions,
for example:
Panel Type: TN + WLED
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 12 million:1 (DCR), brightness 250nits
MAX. resolution (1600x900)
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 20″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 1600x900 pixels with an aspect ratio of 16:9 or 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
Service Web Site
eSupport URL: http://esupport.benq.com

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5. Product Overview
5.1 Monitor Specifications
GL2040
D-sub (include component
source)+ DVI-D
GL2040M
D-sub (include component
source)+ DVI-D + speaker
Panel / Display
Panel Type (TN / VA / IPS) TN + WLED TN + WLED
Panel Size 20"W 20"W
Display Area 442.8x249.075 442.8x249.075
Max. Resolution 1600x900 1600x900
Pixel Pitch 0.2768 0.2768
Brightness (Typ.) 250 cd/㎡250 cd/㎡
Contrast Ratio (Typ.) / DCR
(Min.) 12M:1 (DCR) 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 N/A N/A
MPRT N/A N/A
NTSC ratio 68% 68%
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
Hor. Frequency (KHz) 30-83 30-83
Ver. Frequency (Hz) 50-76 50-76
Video Bandwidth (MHz) 205 205
Audio Speakers (built-in) No 1W x 2
Input/Output
PC Video Input D-sub + DVI-D D-sub + DVI-D
Audio line in No Yes
Earphone Jack No Yes

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Power Supply
Voltage Rating AC: 100~240V (Built-in) AC: 100~240V (Built-in)
Power-On Mode <24W (max) <27W (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 (A flute CTN for BQjp
shipments)
Brown Carton with at least C flute
(A flute CTN for BQjp shipments)
Power LED Green (ON)/ Amber (Standby) Green (ON)/ Amber (Standby)
Tilt (Up / Down) 20° ~ -5° 20° ~ -5°
VESA Wall Mount N/A N/A
Kensington Lock Yes Yes
Container Loading (foam
cushion 40') >1700 >1700
Container Loading (foam
cushion 20') >850 >850
Multi-language
Support OSD
17 Languages (English /
Francais / Deutsch / Italiano /
Espanol / Polish / Czech /
Hungarian / Serbo-croatian /
Romanian / Netherlands /
Russian / Swedish / Protuguese /
Japanese / Chinese / S-Chinese)
17 Languages (English / Francais /
Deutsch / Italiano / Espanol /
Polish / Czech / Hungarian /
Serbo-croatian / Romanian /
Netherlands / Russian / Swedish /
Protuguese / Japanese / Chinese /
S-Chinese)
Other feature
Vista Vista Premium Vista Premium
Win 7 Yes Yes
sRGB Pro Yes Yes
Accessories
VGA cable, power cord, warranty
card, quick start guide, CD
manual
VGA cable, power cord, warranty
card, Audio cable, quick start
guide, CD manual
Regulation
Approvals
Refer to the worksheet
"RFQ-Regulatory"
Refer to the worksheet
"RFQ-Regulatory"

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5.1.1 Certification
Region
Shipment
Country
(Pls
select)
Country
Certification / Requirement
Remark
Request for
Certification
(Pls select)
Certification
(Black is
mandatory and
blue is
voluntary)
Regulatory Type
(safety/safety &
EMC/EMC/GP)
A
pplied by
vendor
Applied
by BenQ
BenQ
Sample
Reguest
Asia-Pa
cific
V
A
ustralia,
New
Zealand
V C-Tick EMC V
Must
include
radiation
test result
for
frequency
above
1GHz
V Taiwan
V BSMI Safety & EMC V
Including
BSMI
certificate,
BSMI
report and
BSMI
authorizati
on letter
for BenQ
Corporatio
nif the
applicant
of BSMI
certificate
is vendor
and
vendor
will
perform
the
clearance
for BenQ.
Green Mark GP
Vender
provide
relevant
information
V 1 set.
One
sample of
DVT is
required

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and report for the
assigned
third-party
test.
Energy Label GP V
One
sample of
DVT is
required
for the
assigned
third-party
test.
Carbon-Footpri
nt Label GP
Vender
provide
relevant
information
and report
V
3rd party
verificatio
n is
required
first.
Europea
n Union
V
Member
countries
of EU
V CE Safety & EMC V
V EuP GP
Vender
provide
relevant
information
and report
V WEEE GP
Vender
provide
relevant
information
and report
V REACH GP
Vender
provide
relevant
information
and report
V Germany
GS Safety V
V Bauart Safety V
Ergo Safety V
V ISO9241-307 Safety V
V MPR II Safety V
Eastern
Europe
V Russia V GOST Safety & EMC V
V Ukraine V UkrSEPRO Safety V
V EMC DoC EMC V

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Internati
onal V CB Scheme V CB Safety V
for CE
DOC or
PSE DOC
or
internation
al
certificatio
n
Internati
onal V Internatio nal V RoHS GP
Vender
provide
relevant
information
and report
Internati
onal V All V
Energy
Star GP V
Including
Test
Report by
EPA
recognitio
n of
Accreditati
on
Laborator
y and
Certificate
by EPA
recognitio
n of
Certificati
on Body
(CB).
Effective
date:
2011-1-1.
BenQ
phase in
date:
2010-12-0
6.

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5.2 Panel Inspection Specification
1. Description
These inspection standards shall be applied to LCD Module supplied by CHI MEI Optoelectronics Corporation.
2. The environmental condition of inspection
The environmental condition and visual inspection shall be conducted as below.
(1) Ambient temperature: 15~25℃
(2) Humidity: 25~75 %RH
(3) External appearance inspection shall be conducted by using a single 20W fluorescent lamp or equivalent
illumination.
(4) Panel visual inspection on the operation condition for cosmetic shall be conducted at the distance 35cm or
more between the LCD module and eyes of inspector. And, the viewing angle shall be 90 degree to the front
surface of display panel.
Ambient Illumination: 400 ~ 600 Lux for external appearance inspection
Ambient Illumination: 100 ~ 200 Lux for light on inspection
(5) Using method for ND Filter
When using ND Filter for judging Mura, placing ND Filter near Mura defect and get close to the surface of LCD
Panel (its distance shall be 1~2cm between the surface of panel and ND Filter.) Don’t touch the surface of
polarizer to avoid scratching polarizer, and then move to the defect position to judge mura by view angle 90
degree (The viewing angle shall be 90 degree to the right top of Mura defect with panel.)
3. Classification of defects
Defects are classified two types, major defect and minor defect according to the defect. And, the definition of
defects is classified as below.
(1) Major defect
Any defect may result in functional failure, or reduce the usability of product for its purpose. For example,
electrical failure, deformation and etc.
(2) Minor defect
A defect that is not to reduce the usability of product for its intended purpose and un-uniformity, dot defect and
etc.
The criteria on major and/or minor judgment will be according with the classification of defects.
4. Inspection Criteria
(1) Definition of dot defect induced from the panel inside a) the definition of dot: The size of a defective dot over
1/2 of whole dot is regarded as one defective dot.
b) Bright dot: Dots appear bright and unchanged in size in which module is displaying under black pattern.
c) Dark dot: Dots appear dark and unchanged in size in which module is displaying under pure red, green, blue
picture.
d) 2 dot adjacent = 1pair = 2 dots
Picture:

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(2) Display Inspection
Items Acceptable count
Bright dot
Random N 2≦
2 dots adjacent N 1≦
3 dots adjacent or more N 0≦
Dark dot
Random N 3≦
2 dots adjacent N 1≦
3 dots adjacent or more N 0≦
Distance Minimum Distance Between Bright dots L 15mm≧
Minimum Distance Between Dark dots L 15mm≧
Total bright and dark dot N 4≦
Display failure (V-line/H-line/Cross line etc.) Not allowable
Mura Not visible through 8% ND filter at 50% gray pattern or judge by limit sample ifnecessary
(2) Appearance inspection
Item Standards
Foreign Black/White/Bright Spot 0.15＜D 0.5 mm, N 4≦≦
Foreign Black/White/Bright Lint 0.05＜W 0.1 mm, 0.5≦＜L 5.0 mm, N 4≦≦
Polarizer Scratches 0.05＜W 0.1 mm, 0.5≦＜L 10.0 mm, N 4≦≦
Dent/Air Bubble Avg. 0.15<D 0.5 mm, N 4≦≦
5. External Appearance Inspection Criteria
Item Contents
Screw Parts mounting, incomplete assembly, deformation, oxidized, crooked or rusty is not
permitted.
CCFT cable Cable not continuous、Break-off 、Connector Burn-off /Break-off
Metal frame
(Bezel)
Scratch *Noticeable scratch and exfoliation coating are not permitted.
*The oxidized metal is not permitted.
Incomplete assembly is not permitted.
Backlight
Scratch The scratch which may cause a problem in practical use is not permitted.
Break-off Breaking off is not permitted.
Crack The crack is not permitted.
Stain on Polarizer The stain which can’t be wiped off is not permitted.
Tape/Label Incorrect position, missed label is not permitted.
Connector Oxidized/rusty connector is not permitted.
Outline size Spec. out is not permitted.

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6. Classification of defects
Inspection Item Criteria and Description Defect type
Vertical line Signal input, vertical line off or
irregular V-line appears major
Horizontal line Signal input, horizontal line off or
irregular H-line appears major
Cross line Pattern signal input, a correct
display is not obtained major
No display Signal input, display is dead major
Irregular display Pattern signal input, a correct
display is not obtained major
Dots defect Exceed specified standards minor
Scratch and Dent
on polarizer Exceed specified standards minor
Foreign material Exceed specified standards minor
External Appearance
Rust, deformation, irregular plating,
coating missing etc.
A appearance defect that do not
affect function or performance
minor
Bezel claw Bezel claw missing or not bent major
Polarizer bubble Exceed specified standards minor

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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.
F/W Upgrade SOP
Upgrade by 715GT089-B/ C
1. Materials list
ISP JIG: 715GT089-B/C VGA cable PC
TPV P/N: 089G728 GAA DB
Monitor USBcable USBportdriver
TPV P/N: 089G1758 X
ISPtool:V4.5.0.8.0 NewF/W

18
2.Connection
3.Install USB driver.
3.1. When insert the USB cable to PC USB port, will pop up a Hardware Wizard to help you install the USB driver if
you use this ISP board first time. You can install it successfully as the below instruction step by step.
Remark: The USB driver files path: D:\FTC100103(Mstar)\FTCUSB.INF

19
4. Install the ISP tool.
4.1.Copy the three files in one folder.
Click “Finish” to
complete the
USB serial port
driver installation.

20
4.2. Double-click to run the ISP tool.
4.3. Set the parameters in “Device” window. Tick “WP Pin pull to high during ISP”.