BenQ G2020HDA User manual

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Applicable Country & Regions: Europe
Service Manual for BenQ:
LCD G2020HDA
(D-SUB+ Black Bezel)
Product Service Manual – Level 1~2
Version: 2nd
Date:09-03-2009
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 (April, 2009)
©Copyright BenQ Corporation 2009. 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.............................................................................................................................................................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................................................................................................................................................7
4. Related service information...................................................................................................................................8
5. Product Overview ...................................................................................................................................................8
5.1 Monitor Specifications........................................................................................................................................8
5.2 Packing.............................................................................................................................................................10
Level 1 Cosmetic / Appearance / Alignment Service ............................................................................................12
Visual Inspection & Cleaning..................................................................................................................................12
Software/Firmware Upgrade Process ....................................................................................................................12
DDC instruction ......................................................................................................................................................15
Adjustment / Alignment Procedure.........................................................................................................................21
Level 2 Circuit Board and Standard Parts Replacement ......................................................................................30
Product Exploded View ..........................................................................................................................................30
Six angles’ view......................................................................................................................................................31
Product Disassembly..............................................................................................................................................32
Block Diagram........................................................................................................................................................36
Schematic Diagram................................................................................................................................................38
Troubleshooting Guide ...........................................................................................................................................46
PCB LAYOUT.........................................................................................................................................................54
Appendix 1 – Screw List / Torque ...........................................................................................................................56

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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 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 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
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.

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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, otherwise it may explode.
9. Refer to government requirements for battery recycling or disposal.
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 G2020HDA 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 color purity right into
the corners)
●high degree of brightness and good contrast
●high resolution (1600x900)
●presentation of up to 16.7 million colors (in conjunction with an appropriate graphics card)
●automatic scanning of horizontal frequencies from 24 to 83 kHz and refresh rates (vertical frequencies) from 50 to
76 Hz (absolutely flicker-free)
●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
●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 20”W MICROPROCESSOR based Multi-mode supported high
resolution color LCD monitor. This monitor can be directly connected to general 15-pin D-sub VGA 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. 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.

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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
5. Product Overview
5.1 Monitor Specifications
G2020HDA
Display
Panel model SEC/LG/AUO/ CMO/CPT
Panel Type (TN / VA / IPS) TN
Panel Size 20"W (2 lamp)
Display Area 442.8x249.2mm
Native. Resolution 1600 x 900
Pixel Pitch 0.2768x0.2768
Brightness (Typ.) 250 nits
Contrast Ratio (Typ.) / DCR (Min.) 1000:1 (Panel) /40000:1 (DCR); Min :20000:1
Viewing Angle (H/V), CR≧10 160/160
Display Colors 16.7M (6bit+Hi-FRC)
Response Time 5ms (Tr+Tf)
GtG response Time N/A
NTSC ratio 72%
Video
BenQ SenseyeTM Technology Yes
BenQ SenseyeTM Preset Modes 5 Modes (by hotkey)
Standard / Movie / Dynamic / Photo / s-RGB
Color Temperature Selection Normal (6500°K) / Reddish (5800°K) / Bluish (9300°K) /
User Mode
Hor. Frequency (KHz) 24kz~83Kz
Ver. Frequency (Hz) 50Hz~76Hz
Video Bandwidth (MHz) 165Mhz

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Audio Speakers (built-in) NA
Input/Output
PC Video Input D-Sub
Audio line in NA
Earphone Jack NA
Power Supply
Voltage Rating AC: 100~240V (Built-in)
Power-On Mode 28W
Standby Mode <1W
Power Off Mode <0.5W
Mechanical
Design
Chassis Colors Glossy black
Carton Brown Carton with at least C flute
Power LED Green (ON)/ Amber (Standby)
Tilt (Up / Down) 20° ~ -5°
VESA Wall Mount 100 x 100mm
Kensington Lock Yes
Container Loading (40') >1600
Container Loading (20') >800
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)
Other feature Vista Vista Basic
Accessories VGA cable, power cord, warranty card, quick start guide,
CD manual
Regulation Approvals Refer to the worksheet "RFQ-Regulatory"

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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
Using the EPS to pack the monitor

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Putting the base and D-SUB cable in the position as the picture shows above.
Putting the monitor and accessories into the carton
User manual
Power cord

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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.
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.
Note: After installation, you must restart the PC to take the setup to effect.
3. Connect the ISP board as follow:
Connect to
the PC LPT
Connect to the
BenQ model

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4. The process of ISP write is as follows.
a. Double-click ，running the program as follows:
b. Choose , click , running the program as follows:

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c. Click icon, search the program” BenQ_G2020HDA_2045LH_SEC_V004.H00”, and click open:
d. Click icon, search the program” BenQ_G2020HDA_2045LH_SEC_V004.H01”, and click open:
e. Click icon, search the program” BenQ_G2020HDA_2045LH_SEC_V004_EXTEND”, and click open:
f. Click icon, until appear the follow Fig, writer completed

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DDC instruction
General
DDC Data Re-programming
In case the main EEPROM with Software DDC which store all factory settings were replaced because a defect
repaired monitor’ the serial numbers have to be re-programmed.
It is advised to re- soldered the main EEPROM with Software DDC from the old board onto the new board if circuit
board have been replaced, in this case the DDC data does not need to be re-programmed.
Additional information about DDC (Display Data Channel) may be obtained from Video Electronics Standards
Association (VESA). Extended Display Identification Data (EDID) information may be also obtained from VESA.
1. When does 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, TPVDDC.exe” program.
d. EDID BOARD (x1), Printer cable(x1), VGA cable (x1), Power cord (x 2), 12V DC power source.
2. Install the “PORT95NT.EXE”, and restart the computer.
The process of installing “PORT95NT” has been specified in, so it will not be specified again. If you have any
problem, please read it.
3. Connect the DDC Board as follow:
Note:
1. The monitor must be power on.
2. Turn off the monitor, keep pressing the “MENU” + “ENTER” buttons, and turn on the monitor, then when we
press the AUTO button, the factory OSD will be at the left top of the panel as below, set the WP “Off “.
Connect to
the PC LPT
When you write analog
EDID, Connect this port
12V DC Input

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4. The process of ISP write is as follow:
a. Double-click ，appear as follow:
b. Choose “Analog ” and then click “Loadfile”, it will show the picture as follow:

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c. Click “OK”, it will show the picture as follow:
d. Input the date in “Year-Month-Day” box, Key in the same 13 numbers in the Input SN and Verify SN, then click
“Program”, when the analog DDC Write complete, it will show the picture as follow:

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G2020HDA EDID
128 bytes EDID Data (Hex):
x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
0: 00 FF FF FF FF FF FF 00 09 D1 1E 78 45 54 00 00
10: 01 0C 01 03 0E 2C 19 78 2E 3D 85 A6 56 4A 9A 24
20: 12 50 54 A5 6A 00 61 C0 81 C0 81 CF A9 CF 01 01
30: 01 01 01 01 01 01 2F 26 40 A0 60 84 1A 30 30 20
40: 35 00 BB F9 10 00 00 1A 00 00 00 FF 00 32 31 32
50: 33 31 33 32 31 32 33 33 0A 20 00 00 00 FD 00 32
60: 4C 18 53 11 00 0A 20 20 20 20 20 20 00 00 00 FC
70: 00 42 65 6E 51 20 47 32 30 32 30 48 44 41 00 05
Decoded EDID data
<---Header--->
Header: 00 FF FF FF FF FF FF 00
<-x-Header-x->
<---Vendor/Product Identification--->
ID Manufacturer Name: BNQ
ID Product Code: 781E
ID Serial Number: 45540000
Week of Manufacture: 1
Year of Manufacture: 2002
<-x-Vendor/Product Identification-x->
<---EDID Structure Version/Revision--->
EDIDVersion#: 01
EDIDRevision#: 03
<-x-EDID Structure Version/Revision-x->
<---Basic Display Parameters/Features--->
Video i/p definition: Analog
Signal Level Standard: 0.700V/0.300V (1.000Vpp)
Setup: Blank-to-Blacknotexpected
Separate Sync Support: Yes

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Composite Sync Support: Yes
Sync. on green video supported:Yes
Serration of the Vsync.Pulse is not required.
Max. H. Image Size: 44cm.
Max. V. Image Size: 25cm.
DisplayGamma: 2.2
DPMS Features, Stand-by: No.
DPMS Features, Suspend: No.
DPMS Features, Active off:Yes.
Display Type: R.G.B color display.
Standard Default Color Space: Primary color space.
Preferred Timing Mode: In First Detailed Timing.
GTF supported: No.
<---Basic Display Parameters/Features--->
<---Color Characteristics--->
Red x: 0.6484375000
Red y: 0.3388671875
Green x: 0.2929687500
Green y: 0.6025390625
Blue x: 0.1425781250
Blue y: 0.0703125000
White x: 0.3125000000
White y: 0.3291015625
<-x-Color Characteristics-x->
<---Established Timings--->
Established Timings 1: A5
-720x400 @70Hz VGA, IBM
-640x480 @60Hz VGA, IBM
-640x480 @75Hz VESA
-800x600 @60Hz VESA
Established Timings 2: 6A
-800x600 @75Hz VESA
-832x624 @75Hz Apple,Mac II
-1024x768 @60Hz VESA
-1024x768 @75Hz VESA
Established Timings 3: 00
<-x-Established Timings-x->
<---Standard Timing Identification--->
-1024x576@60 Hz

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-1280x720@60 Hz
-1280x720@75 Hz
-1600x900@75 Hz
<-x-Standard Timing Identification-x->
<---Detailed Timing Descriptions--->
Detailed Timing: 1600x900 @ 60Hz
<-x-Detailed Timing Descriptions-x->
<---Detailed Timing Descriptions--->
Detailed Timing:FF (Monitor SN) '21231321233'
Detailed Timing:FD (Monitor limits)
Min. V. rate: 50Hz
Max. V. rate: 76Hz
Min. H. rate: 24 KHz
Max. H. rate: 83 KHz
Max. Pixel Clock: 170MHz
Detailed Timing: FC (Monitor Name) 'BenQ G2020HDA '
<-x-Detailed Timing Descriptions-x->
Extension Flag: 00
Checksum: 05