BenQ G922HD Service Manual

Applicable Country & Regions: China

Service Manual for BenQ:

LCD G922HD

(D-SUB+DVI+ Silver Black/

Black Bezel)

Product Service Manual – Level 1~2

Version: 1st

Date:04-16-2009

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

most recent version of this manual.

, to ensure that you have the

First Edition (April, 2009)

18.5” LCD Color Monitor BenQ G922HD

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 Notice ......................................................................................................................................................6

2.3 Compliance Statement .......................................................................................................................................6

3. General Description................................................................................................................................................7

4. Related service information...................................................................................................................................7

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.........................................................................................................................23

Level 2 Circuit Board and Standard Parts Replacement ......................................................................................32

Product Exploded View ..........................................................................................................................................32

Six angles’ view ......................................................................................................................................................33

Product Disassembly..............................................................................................................................................34

Block Diagram ........................................................................................................................................................38

Schematic Diagram ................................................................................................................................................40

Troubleshooting Guide ...........................................................................................................................................47

PCB LAYOUT .........................................................................................................................................................55

Appendix 1 – Screw List / Torque ...........................................................................................................................58

18.5” LCD Color Monitor BenQ G922HD

Abbreviations & Acronyms

ADC Analog to Digital Converter

AFC Automatic Frequency Control: control signal used to tune to the correct frequency

BenQ BenQ Corporation

BTSC Broadcast Television System Committee

CPU Central Process Unit

CVBS Composite Video Blanking and Synchronization

DLP Digital Light Processing / Texas Instruments®

DMD Digital Micromirror Device

DRAM Dynamic RAM

DVI Digital Video Interface

DVI-I Digital Video Interface-Integrated

EEPROM Electrically Erasable and Programmable Read Only Memory

FLASH FLASH memory

G-TXT Green Teletext

HDMI High Definition Multimedia Interface, digital audio and video interface

HP Head Phone

I2C Integrated IC bus

LED Light Emitting Diode

LVDS Low Voltage Differential Signal, data transmission system for high

MOSFET Metal Oxide Semiconductor Field Effect Transistor

18.5” LCD Color Monitor BenQ G922HD

NC Not Connected

NVM Non Volatile Memory: IC containing TV related data (for example, options)

OSD On Screen Display

PC Personal Computer

PCB Printed Circuit Board (or PWB)

RC Remote Control transmitter

RGB

ROM Read Only Memory

SDA Data signal on I2C bus

SDRAM Synchronous DRAM

SW Sub Woofer / Software

THD Total Harmonic Distortion

VGA Video Graphics Array

YPbPr

Red, Green and Blue. The primary color signals for TV. By mixing levels of R, G

and B, all colors (Y/C) are

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.

18.5” LCD Color Monitor BenQ G922HD

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

18.5” LCD Color Monitor BenQ G922HD

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 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.

18.5” LCD Color Monitor BenQ G922HD

3. General Description

This new LCD (Liquid Crystal Display) monitor BenQ G922HD 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)

● Contrast ratio 1000:1, brightness 250nits

● WXGA resolution (1366 x 768)

● Presentation of up to 16.7 million colors (in conjunction with an appropriate graphics card)

● Automatic scanning of horizontal frequencies from 30 to 63 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 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 18.5” MICROPROCESSOR based Multi-mode supported high

resolution color LCD monitor. This monitor can be directly connected to general 15-pin D-sub VGA connector and

DVI 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 1366x768 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

18.5” LCD Color Monitor BenQ G922HD

5. Product Overview

5.1 Monitor Specifications

G922HD

Panel Type (TN / VA / IPS) TN

Panel Size 18.5"W(2 lamps)

Display Area 409.8 x 230.4

Max. Resolution 1366x768

Brightness (Typ.) 250 nits

Contrast Ratio (Typ.) / DCR (Min.) 1000:1 (Panel) /40000:1 (DCR TYP) Min :20000:1

Panel / Display

Viewing Angle (H/V), CR≧10

Display Colors 16.7M (6bit+Hi-FRC)

170/160

Response Time 5ms (Tr+Tf)

GtG response Time N/A

NTSC ratio 0.72

Panel maker AUO/CMO

BenQ Senseye

Technology Yes

Preset Modes

5 Modes (by hotkey) : Standard / Movie / Dynamic /

Photo / s-RGB

Normal (6500°K) / Reddish (5800°K) / Bluish

Color Temperature Selection

Video

(9300°K) / User Mode

Hor. Frequency (KHz) 30~63KHz

Ver. Frequency (Hz) 50Hz~76Hz

Video Bandwidth (MHz) 110Mhz

Audio Speakers (built-in) N/A

Input/Output

Power Supply

PC Video Input D-sub + DVI-D

Audio line in Yes

Earphone Jack NO

Voltage Rating AC: 100~240V (Built-in)

Power-On Mode 23W

Standby Mode <1W

Power Off Mode <0.5W

18.5” LCD Color Monitor BenQ G922HD

Chassis Colors Silver Black/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

Mechanical Design

Physical Dimension (WxHxD) TBD

Box Dimension (WxHxD) TBD

Net Weight (Esti.) TBD

Gross Weight (Esti.) TBD

Container Loading (40') 2070

Container Loading (20') 990

17 Languages (English / Francais / Deutsch /

Italiano / Espanol / Polish / Czech / Hungarian /

Multi-language Support OSD

Other feature Vista Vista Premium

Accessories

Regulation Approvals Refer to the worksheet "RFQ-Regulatory"

Serbo-croatian / Romanian / Netherlands / Russian

/ Swedish / Protuguese / Japanese / Chinese /

S-Chinese)

VGA cable, power cord, warranty card, quick start

guide, CD manual

18.5” LCD Color Monitor BenQ G922HD

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

18.5” LCD Color Monitor BenQ G922HD

Putting the base and D-SUB cable in the position as the picture shows above.

Power cord

User manual

Putting the monitor and accessories into the carton

18.5” LCD Color Monitor BenQ G922HD

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 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” program

d. ISP BOARD (x1), Printer cable (x1), 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

18.5” LCD Color Monitor BenQ G922HD

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:

18.5” LCD Color Monitor BenQ G922HD

c. Click

d. Click

e. Click

icon, search the program” BenQ_G922HD_RTD2525LH_CMO185.H00”, and click open:

icon, search the program” BenQ_G922HD_RTD2525LH_CMO185.H01”, and click open:

icon, search the program” BenQ_G922HD_RTD2525LH_CMO185_EXTEND”, and click open:

f. Click

icon, until appear the follow Fig, writer completed

18.5” LCD Color Monitor BenQ G922HD

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. OSD SN BOARD (x1), Printer cable(x1), VGA cable (x1), 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:

When you write digital

EDID, Connect this port

Connect to

When you write analog

EDID, Connect this port

the PC LPT

12V DC Input

18.5” LCD Color Monitor BenQ G922HD

4. Take analog DDC write for example, as follow

a. Double-click

，appear as follow:

b. Choose “Analog ” and then click “Loadfile”, it will show the picture as follow:

18.5” LCD Color Monitor BenQ G922HD

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:

Note:

The way of digital DDC Write is the same as analog.

18.5” LCD Color Monitor BenQ G922HD

G922HD EDID

Analog

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 3D 78 45 54 00 00

10: 0D 0F 01 03 0E 29 17 78 2E 3D 85 A6 56 4A 9A 24

20: 12 50 54 A5 6A 00 81 C0 81 CF 01 01 01 01 01 01

30: 01 01 01 01 01 01 66 21 56 AA 51 00 1E 30 46 8F

40: 33 00 9A E6 10 00 00 1E 00 00 00 FF 00 33 34 35

50: 36 38 39 37 30 31 32 33 0A 20 00 00 00 FD 00 32

60: 4C 1E 3F 0B 00 0A 20 20 20 20 20 20 00 00 00 FC

70: 00 42 65 6E 51 20 47 39 32 32 48 44 0A 20 00 94

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: 783D

ID Serial Number: 45540000

Week of Manufacture: 13

Year of Manufacture: 2005

<-x-Vendor/Product Identification-x->

<---EDID Structure Version/Revision--->

EDID Version#: 01

EDID Revision#: 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-Black not expected

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