Asus VG27WQ1B User manual

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LCD Monitor Service Manual
Model: ASUS VG27WQ1B
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SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATION USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE, AND
SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMENS NO
RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS
MANUAL, INCLUDING THE PRODUCT AND SOFTWARE DESCRIBED IN IT.

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Index
Revision Lists............................................................................................................................3
IMPORTANT SAFETY NOTICE ...............................................................................................4
1. Monitor Specifications...........................................................................................................5
2. Operation Instruction ............................................................................................................7
2.1 General Instructions............................................................................................................7
2.2 Control Button.....................................................................................................................7
2.3 OSD Menu ........................................................................................................................10
3. Input/ Output Specification..................................................................................................18
3.1 Input Signal Connector .....................................................................................................18
3.2 Power Supply Requirements ............................................................................................18
3.3 Supported Timing List.......................................................................................................19
4. Block Diagram ....................................................................................................................20
4.1 Main Board .......................................................................................................................20
4.2 Power Board .....................................................................................................................21
5. Schematic...........................................................................................................................22
5.1 Main Board .......................................................................................................................22
5.2 Power Board .....................................................................................................................32
5.3 Key Board .........................................................................................................................33
5.4 LED Board ........................................................................................................................34
6. PCB Layout......................................................................................................................... 35
6.1 Main Board .......................................................................................................................35
6.2 Power Board .....................................................................................................................39
6.3 Key Board .........................................................................................................................42
6.4 LED Board ........................................................................................................................43
7. Disassembly & Assembly SOP ...........................................................................................44
7.1 Precaution.........................................................................................................................44
7.2. Suggest Tools..................................................................................................................45
7.3. Disassembly Procedure...................................................................................................46
7.4 Assembly Procedure.........................................................................................................52
8. ISP Instruction..................................................................................................................53
9. DDC Instruction................................................................................................................63
10. Color/ White Balance Adjustment .....................................................................................70
11. Trouble Shooting ..............................................................................................................72
12. Exploded View ..................................................................................................................76
13. BOM list ............................................................................................................................78

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Revision Lists
Version Release Date Revision History Customer Model TPV Model Name
A00 May.27,2020 Initial release VG27WQ1B HFN9BA2BCCU1DN

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IMPORTANT SAFETY NOTICE
Safety information
Before setting up the monitor, carefully read all the documentation that came with the package.
To prevent fire or shock hazard, never expose the monitor to rain or moisture.
Never try to open the monitor cabinet. The dangerous high voltages inside the monitor may result in serious
physical injury.
If the power supply is broken, do not try to fix it by yourself. Contact a qualified service technician or your retailer.
Before using the product, make sure all cables are correctly connected and the power cables are not damaged. If
you detect any damage, contact your dealer immediately.
Slots and openings on the back or top of the cabinet are provided for ventilation. Do not block these slots. Never
place this product near or over a radiator or heat source 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 supply to your home, consult your dealer or local power company.
Use the appropriate power plug which complies with your local power standard.
Do not overload power strips and extension cords. Overloading can result in fire or electric shock.
Avoid dust, humidity, and temperature extremes. Do not place the monitor in any area where it may become wet.
Place the monitor on a stable surface.
Unplug the unit during a lightning storm or if it will not be used for a long period of time. This will protect the monitor
from damage due to power surges.
Never push objects or spill liquid of any kind into the slots on the monitor cabinet.
To ensure satisfactory operation, use the monitor only with UL listed computers which have appropriate configured
receptacles marked between 100-240V AC.
If you encounter technical problems with the monitor, contact a qualified service technician or your retailer.
Care & Cleaning
Before you lift or reposition your monitor, it is better to disconnect the cables and power cord. Follow the correct
lifting techniques when positioning the monitor. When lifting or carrying the monitor, grasp the edges of the monitor.
Do not lift the display by the stand or the cord.
Cleaning. Turn your monitor off and unplug the power cord. Clean the monitor surface with a lint-free, non-abrasive
cloth. Stubborn stains may be removed with a cloth dampened with mild cleaner.
Avoid using a cleaner containing alcohol or acetone. Use a cleaner intended for use with the LCD. Never spray
cleaner directly on the screen, as it may drip inside the monitor and cause an electric shock.
The following symptoms are normal with the monitor
The screen may flicker during the initial use due to the nature of the fluorescent light. Turn off the Power Switch and
turn it on again to make sure that the flicker disappears.
You may find slightly uneven brightness on the screen depending on the desktop pattern you use.
When the same image is display for hours, an afterimage of the previous screen may remain after switching the
image. The screen will recover slowly or you can turn off the Power Switch for hours.
When the screen becomes black or flashes, or cannot work anymore, contact your dealer or service center to fix it.
Do not repair the screen by yourself!
Conventions used in this guide
WARNING: Information to prevent injury to yourself when trying to complete a task.
CAUTION: Information to prevent damage to the components when trying to complete a task.
IMPORTANT: Information that you MUST follow to complete a task.
NOTE:Tipsandadditionalinformationtoaidincompletingatask.
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1. Monitor Specifications
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Dimension of Monitor
Dimension VG27WQ1B
with stand 610.34(W)x 475.16(H) x213.78(D) (mm)
without stand 610.34 (W)x 367.34(H) x 77.72(D) (mm)

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2. Operation Instruction
2.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at the front of the panel of
the monitor.
2.2 Control Button
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Rear of the LCD monitor

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2.3 OSD Menu

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3. Input/ Output Specification
3.1 Input Signal Connector
HDMI Pin Assignment
1 TMDS Data2＋11 TMDS Clock Shield
2 TMDS Data2 Shield 12 TMDS Clock－
3 TMDS Data2－13 CE REMOTE
4 TMDS Data1＋14 NC
5 TMDS Data1 Shield 15 DDC CLK
6 TMDS Data1－16 DDC DATA
7 TMDS Data0＋17 GND
8 TMDS Data0 Shield 18 ＋5V Power
9 TMDS Data0－19 Hot Plug Detect
10 TMDS Clock＋
DP Pin Assignment
1 ML_Lane 3 (n) 11 GND
2 GND 12 ML_Lane 0 (p)
3 ML_Lane 3 (p) 13 CONFIG1
4 ML_Lane 2 (n) 14 CONFIG2
5 GND 15 AUX_CH(p)
6 ML_Lane 2 (p) 16 GND
7 ML_Lane 1 (n) 17 AUX_CH(n)
8 GND 18 Hot Plug Detect
9 ML_Lane 1 (p) 19 Return DP_PWR
10 ML_Lane 0 (n) 20 DP_PWR
3.2 Power Supply Requirements
A/C Line voltage range : 100V ~ 240 V
A/C Line frequency range : 50Hz, 60 Hz
Peak surge current : no damage at 240 VAC and cold starting
Leakage current : < 3.5mA
Power line surge : No advance effects (no loss of information or defect)
with a maximum of 1 half-wave missing per second
Safety certification :CCC,CECP, cCTUVus, EPA 7.0, TCO 7.0, GS or Bauart,
ISO9241-307
EMC : FCC,CE

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3.3 Supported Timing List
PC Supported Primary Timing
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4. Block Diagram
4.1 Main Board