BenQ G900WA Diagram
19” LCD Color Monitor BenQ G900WA
Content Index
1.AboutThisManual......................................................................................................................................................... 2
2.Introduction................................................................................................................................................................... 3
2.1 RoHS requirement ...........................................................................................................................................................3
2.2 Safety Notice.....................................................................................................................................................................3
2.3 General Description .........................................................................................................................................................4
2.4 Related service information ............................................................................................................................................4
3.ProductOverview........................................................................................................................................................... 6
3.1 Monitor Specifications .....................................................................................................................................................6
3.2 Input Signal Connector....................................................................................................................................................7
3.3 Factory Preset Display Modes .......................................................................................................................................7
3.4 Panel Specification...........................................................................................................................................................8
4Disassembly/Assembly ................................................................................................................................................. 13
4.1 Three angles’ view .........................................................................................................................................................13
4.2 Exploded View................................................................................................................................................................14
4.3Disassembly .......................................................................................................................................................................15
5.Cosmetic / Appearance / Alignment Service......................................................................................................... 19
5.1Software/FirmwareUpgradeProcess................................................................................................................................19
5.2Adjustment/AlignmentProcedure ...................................................................................................................................22
5.3White‐Balance,LuminanceAdjustment.............................................................................................................................31
6CircuitBoardandStandardPartsReplacement .............................................................................................................. 33
6.1ElectricalBlockDiagram ....................................................................................................................................................33
6.2TroubleshootingGuide.......................................................................................................................................................35
6.3Circuitoperationtheory.....................................................................................................................................................42
6.4BOMList ............................................................................................................................................................................44
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19” LCD Color Monitor BenQ G900WA
1. About This Manual
This Service Manual is issued by engineer of TPV customer service according to the structure and capability
of various models. 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.
If you have any questions, please contact with the engineers of TPV customer service.
COLOR MONITOR
MODEL ID G900WA (EU)
1st Edition
July 2007
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19” LCD Color Monitor BenQ G900WA
2. Introduction
2.1 RoHS requirement
Overview
-Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (RoHS) Directive
2002/95/EC is published in the Official Journal 13 February 2003 (OJ L37, 13.2.2003, p.19).
-Purpose: Reduction of the environmental and health risks posed by hazardous materials in EEE.
-It is complementary to & running in parallel with the WEEE Directive.
-Transposed into national law by 13 August 2004. And comes into effect 1 July 2006.It is similar to the WEEE
Directive, except:
Applies to new EEE placed on the market after 1 July 2006.
Includes household filament light bulbs & luminaries.
Excludes: Medical devices or monitoring & control equipment (WEEE categories 8 & 9);Spare parts for the repair of
EEE placed on the market before 1 July 2006; Re-used EEE originally placed on the market before 1 July 2006.
2.2 Safety Notice
FCC Notice
FCC Class B Radio Frequency Interference Statement WARNING: (FOR FCC CERTIFIED MODELS)
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in
a residential installation. This equipment generates, uses and can radiate radio frequency energy, and if not
installed and used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
4. Consult the dealer or an experienced radio/TV technician for help.
NOTICE :
1. The changes or modifications not expressly approved by the party responsible for compliance could void the
user's authority to operate the equipment.
2. Shielded interface cables and AC power cord, if any, must be used in order to comply with the emission
limits.
3. The manufacturer is not responsible for any radio or TV interference caused by unauthorized modification to
this equipment. It is the responsibilities of the user to correct such interference.
Power Safety
1.The AC plug isolates this equipment from the AC supply.
2.The power supply cord serves as a power disconnect device for pluggable equipment. The socket outlet should be
installed near the equipment and be easily accessible.
3.This product should be operated from the type of power indicated on the marked label. If you are not sure of the
type of power available, consult your dealer or local power company.
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19” LCD Color Monitor BenQ G900WA
2.3 General Description
This new LCD (Liquid Crystal Display) monitor BenQ G900WA 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
● high resolution (1440 x 900)
● presentation of up to 16.7 million colours (in conjunction with an appropriate graphics card)
● automatic scanning of horizontal frequencies from 31 to 83 kHz and refresh rates (vertical frequencies) from 56 to
76 Hz (absolutely flicker-free)
● digital screen controller with microprocessor for storing 20 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.
A graphics card (screen controller) with VGA interface is required to control the BenQ G900WA LCD monitor. The
monitor processes the data supplied to it by the screen controller. The screen controller or the associated driver
software is responsible for setting the modes (resolution and refresh rate).
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 1440 x 900 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.
2.4 Related service information
• Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool
or in a wet basement.
• Do not place the monitor on an unstable cart, stand, or table. If the monitor falls, it can injure a person and
cause serious damage to the appliance. Use only a cart or stand recommended by the manufacturer or sold
with the monitor. If you mount the monitor on a wall or shelf, use a mounting kit approved by the
manufacturer and follow the kit instructions.
• Slots and openings in the back and bottom of the cabinet are provided for ventilation. To ensure reliable
operation of the monitor and to protect it from overheating, be sure these openings are not blocked or
covered. Do not place the monitor on a bed, sofa, rug, or similar surface. Do not place the monitor near or
over a radiator or heat register. Do not place the monitor in a bookcase or cabinet unless proper ventilation
is provided.
• The monitor should be operated only from the type of power source indicated on the label. If you are not
sure of the type of power supplied to your home, consult your dealer or local power company.
• The monitor is equipped with a three-pronged grounded plug, a plug with a third (grounding) pin. This plug
will fit only into a grounded power outlet as a safety feature. If your outlet does not accommodate the
three-wire plug, have an electrician install the correct outlet, or use an adapter to ground the appliance
safely. Do not defeat the safety purpose of the grounded plug.
• Unplug the unit during a lightning storm or when it will not be used for long periods of time. This will protect
the monitor from damage due to power surges.
• Do not overload power strips and extension cords. Overloading can result in fire or electric shock.
• Never push any object into the slot on the monitor cabinet. It could short circuit parts causing a fire or
electric shock. Never spill liquids on the monitor.
• Do not attempt to service the monitor yourself; opening or removing covers can expose you to dangerous
voltages and other hazards. Please refer all servicing to qualified service personnel.
• To ensure satisfactory operation, use the monitor only with UL listed computers which have appropriate
configured receptacles marked between 100 - 240V AC, Min. 5A.
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19” LCD Color Monitor BenQ G900WA
• The wall socket shall be installed near the equipment and shall be easily accessible.
• For use only with the attached power adapter (Output 12Vdc) which have UL,CSA listed license(Only for
monitors with power adapter).
Since the equipment is compatible with RoHS Directive, use components in which the use of specific chemically
noxious substances is restricted; use only designated spare parts when it is necessary to replace such parts with
new parts.
Use lead-free solder for the equipment compatible with ones with substrates on which lead-free components are
mounted. For the details, refer to “Caution for Lead-Free Soldering Work” given in the next page.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment.
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19” LCD Color Monitor BenQ G900WA
/
3. Product Overview
3.1 Monitor Specifications
Driving system TFT Color LCD
Size 48cm(19")
Pixel pitch 0.285mm(H) × 0.285mm(V)
LCD Panel
Viewable angle
160, 160 (CR>10)
Contrast 800:1
Brightness
300 cd/m2
Response time 5ms(typical)
Video R, G, B Analog Interface
Separate Sync. H/V TTL
Input
H-Frequency
V-Frequency
31 - 83 kHz Multi- frequency monitor
55 - 76 Hz modes within these parameters
Display Colors 16.7M Colors
Max. Resolution
1440 x 900
Plug & Play VESA DDC2B
ON Mode ≤40W
EPA ENERGY
STAR
®
saving mode
< 1 Watt, 120 V
< 2 Watt, 240 V
Input Connector 15-pin D-Sub
TM
Input Video Signal
Analog: 0. 7Vp-p(standard),
75 OHM, Positive
Power Source 100~240VAC,50~60Hz
Environmental
Considerations
Dimension
Weight (N. W.)
Certifications
Operating Temp: 0° to 40°C
Operating Humidity: 10% to 90%
441.3 x 365.7 x 165 mm
3.73 kg
TCO 03/99, TÜV
Ergonomics, TÜV/ GS, FCC Class B, VCCI, CB
Report, CE, C-Tick, Fimko, GOST, MIC, EPA, CCC, BSMI, CSA,
SASO, PSB, NOM, TUV-Argentina
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19” LCD Color Monitor BenQ G900WA
3.2 Input Signal Connector
Pin No.
1. Red 9. +5V
2. Green 10. Detect Cable
3. Blue 11. Ground
4. Ground 12. DDC-Serial Data
5. VGA_CON 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
3.3 Factory Preset Display Modes
Description Pin No. Description
15
6
11 15
10
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19” LCD Color Monitor BenQ G900WA
3.4 Panel Specification
M190A1-L07
OVERVIEW
M190A1-L07 is a 19” wide TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins 2ch-LVDS
interface. This module supports 1440 x 900 WXGA+ mode and can display 16.7M colors. The inverter module for
Backlight is not built in.
General Specifications
Mechanical Specifications
Electrical Characteristics
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19” LCD Color Monitor BenQ G900WA
Optical Characteristics
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19” LCD Color Monitor BenQ G900WA
LTM190M2-L31
OVERVIEW
LTM190M2-L31 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT(Thin Film
Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back light
unit. The resolution of a 19.0” is 1440 x 900 and this model can display up to 16.7 millions colors.
General Specifications
Mechanical Specifications
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19” LCD Color Monitor BenQ G900WA
Electrical Characteristics
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19” LCD Color Monitor BenQ G900WA
Optical Characteristics
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19” LCD Color Monitor BenQ G900WA
4 Disassembly /Assembly
4.1 Three angles’ view
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19” LCD Color Monitor BenQ G900WA
4.2 Exploded View
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19” LCD Color Monitor BenQ G900WA
4.3 Disassembly
Note: Only the monitor G900W has both D-SUB and DVI connectors. The Monitor G900WA dose not have
DVI Connector.
1). Back View as Fig1
Place the monitor face down on a smooth surface as Fig 1. Be careful to avoid scratch and injury during the
uninstall.
Fig1
2).Remove the STAND-BASE ASS'Y
Remove the two screws in red to remove the STAND-BASE ASS'Y as Fig2.
Fig2
3).Remove the Rear Cover and Bezel
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19” LCD Color Monitor BenQ G900WA
The arrows in blue are the hook that we should put attention to when remove the rear cover. Use plastic putty knife
to release the 6 hooks on the bottom,6 hooks on the top,5 hooks on the left,5 hooks on the right and remove the only
one screw in red as Fig3 on the rear cover , then you can easily remove the rear cover and bezel.
Fig3
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19” LCD Color Monitor BenQ G900WA
4).Remove the Panel
Remove the 4 screws on the side of main frame first, and then disconnect the Lamp Connections and LVDS
Cable connection.
LVDS CABLE
SCREWS
Lamp Connection
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19” LCD Color Monitor BenQ G900WA
5).Remove the Main Board and Power Board
Remove the screws in red and disconnect the all connections, at last you can get the Main Board and Power
Board as follow.
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