AOC G27770PF Service Manual
27" Flat wide monitor AOC G2770PF
Service
Service
Service
Horizontal Frequency
30 - 83kHz
Table of Contents
Description Page Description Page
Table of Contents…………………..…………………..…...1
Revision List.…...................................................……......2
Important Safety Notice.….….............................……......3
1.Monitor Specification..............................………............4
2.LCD Monitor Description……….…………………….......5
3.Operation Instruction.…………...................……...........6
3.1.General Instructions....................................…...........6
3.2.Control Buttons and Connections...............................6
3.3.OSD Setting…..........................................................8
4.Input/Output Specification...............……………….......19
4.1.Input Signal Connector...............………..................19
4.2.Preset Display Modes…….......................................21
4.3.Panel Specification…………..………………………..22
5.Block Diagram….........................................................24
5.1.Main Board…..….............................................24
5.2.Power Board…………..…………………………......25
6.Schematic…………..….........................................26
6.1.Main Board..…….…...........................................26
6.2.Power Board..……….........................................35
6.3.Key Board..……….........................................37
6.4.USB Board..………........................................38
7.PCB Layout..……….............................................39
7.1.Main Board………..…........................................39
7.2.Power Board….…..............................................43
7.3.Key Board………..…..........................................45
7.4.USB Board………..….........................................45
8.Maintainability………............................................47
8.1.Equipments and Tools Requirement…...............47
8.2.Trouble Shooting…..………...............................48
9.White-Balance,Luminance Adjustment…..............52
10.Monitor Exploded View……...............................54
11.BOM List…………..……………………….............55
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC
EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
Revision List
Version Release Date Revision History TPV Model Name
A00 Jun.-03-2015
A01 Aug.-04-2015 Add new models HFEAV96DAVACDZE
A02 Aug.-25-2015 Add new models HFEAV96KAVACDNE
A03 Oct.-09-2015 Add new models HFEAV96LAVACDNE
A04 Dec.-28-2015 Add new models HFEAV96LAVA7DNE
Initial release
HFEAV96BAVACDNE
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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The special
tools should be used when and as recommended.
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. It is also important to understand that these CAUTIONS and NOTICES ARE NOT
EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in which
service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics may create shock,
fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC. AOC
assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may result
in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)
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1. Monitor Specifications
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2. LLCD Monitor Description
The LCD monitor will contain a main board, a power board, an usb board and a key board which house the flat panel
control logic, brightness control logic and DDC.
The power part will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each
voltage.
Power Board
AC-IN
100V-240V
Monitor Block Diagram
LED Drive.
Flat Panel and
LED backlight
Main Board
Key Board USB Board
HOST Computer
RS232 Connector
For white balance
adjustment in factory
Video signal, DDC
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3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control knobs are located at front panel of the monitor
(See Figure ). By changing these settings, the picture can be adjusted to your personal preferences.
* The power cord should be connected.
* Press the power button to turn on the monitor. The power indicator will light up.
3.2 Control Buttons and Connections
1 Source/Auto/Exit
2 Game Mode/-
3 Volume/+
4 Menu/Enter
5 Power
Clear Vision
1. When there is no OSD, Press the “-” button to activate Clear Vision.
2. Use the “-” or “+” buttons to select between weak, medium, strong, or off settings. Default setting is always “off”.
3. Press and hold “-” button for 5 seconds to activate the Clear Vision Demo, and a message of “Clear Vision Demo:
on” will be display on the screen for a duration of 5 seconds. Press Menu or Exit button, the message will disappear.
Press and hold “-” button for 5 seconds again, Clear Vision Demo will be off.
Clear Vision function provides the best image viewing experience by converting low resolution and blurry images into
clear and vivid images.
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1. Power
2. Analog (D-Sub 15-Pin VGA cable)
3. DVI
4. HDMI
5. Audio in
6. Earphone out
7. Display port
8. HDMI/MHL
9. USB input
10. USB 2.0x2
11. USB 3.0
12. USB 3.0+ fast charging
13. AC power switch
To protect equipment, always turn off the PC and LCD monitor before connecting.
1. Connect the power cable to the AC port on the back of the monitor.
2. Connect one end of the 15-pin D-Sub cable to the back of the monitor and connect the other end to the computer's D-Sub port.
3. (Optional –Requires a video card with DVI port)Connect one end of the DVI cable to the back of the monitor and connect the
other end to the computer’s DVI port.
4. (Optional – Requires a video card with HDMI port) - Connect one end of the HDMI cable to the back of the monitor and connect
the other end to the computer’s HDMI port.
5. (Optional – Requires a video card with DP port) - Connect one end of the DP cable to the back of the monitor and connect the
other end to the computer’s DP port.
6. (Optional – Requires a video card with MHL port) - Connect one end of the MHL cable to the back of the monitor and connect the
other end to the computer’s MHL port.
7. (Optional)Connect the audio cable to audio in port on the back of the monitor
8. Turn on your monitor and computer.
If your monitor displays an image, installation is complete. If it does not display an image, please refer Troubleshooting.
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3.3 OSD Setting
Basic and simple instruction on the control keys.
1. Press the MENU-button to activate the OSD window.
2. Press - or + to navigate through the functions. Once the desired function is highlighted, press the MENU-button to
activate. Press - or + to navigate through the sub-menu. Once the desired function is highlighted, press MENU-button
to activate.
3. Press - or + to change the settings of the selected function. Press AUTO to exit. If you want to adjust any other
function, repeat steps 2-3.
4. OSD Lock Function: To lock the OSD, press and hold the MENU-button while the monitor is off and then press
power-button to turn the monitor on. To un-lock the OSD, press and hold the MENU-button while the monitor is off
and then press power-button to turn the monitor on.
Notes:
1. If the product has only one signal input, the item of "Input Select" is disabled.
2. If the product screen size is 4:3 or input signal resolution is wide format, the item of "Image Ratio" is disabled.
3. One of Clear vision, DCR, Color Boost, and Picture Boost functions is activated; the other three functions are turned
off accordingly.
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Luminance
1 Press
2 Press - or + to select
3 Press - or + to select submenu, and press
4 Press - or + to adjust.
5 Press
(Menu) to display menu.
(Luminance), and press to enter.
to exit.
to enter.
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10 11
Image Setup
1 Press
(Menu) to display menu.
2 Press - or + to select
3 Press - or + to select submenu, and press
4 Press - or + to adjust.
5 Press
to exit.
(Image Setup), and press to enter.
to enter.
Color Setup
1 Press
(Menu) to display menu.
2 Press - or + to select
3 Press - or + to select submenu, and press
4 Press - or + to adjust.
5 Press
to exit.
(Color Setup), and press to enter.
to enter.
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Picture Boost
1 Press
2 Press - or + to select
3 Press - or + to select submenu, and press
4 Press - or + to adjust.
5 Press
(Menu) to display menu.
(Picture Boost), and press to enter.
to exit.
to enter.
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OSD Setup
1 Press (Menu) to display menu.
2 Press - or + to select
3 Press - or + to select submenu, and press
4 Press - or + to adjust.
5 Press
to exit.
(OSD Setup), and press to enter.
to enter.
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Extra
1 Press
2 Press - or + to select
3 Press - or + to select submenu, and press
4 Press - or + to adjust.
5 Press
(Menu) to display menu.
(Extra), and press to enter.
to exit.
to enter.
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Exit
1 Press
2 Press - or + to select
3 Press
(Menu) to display menu.
to exit.
(Exit), and press to enter.
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LED Indicators
Status LED Color
Full Power Mode Green or Blue
Active-off Mode Orange or red
i-Menu
Welcome to “i-Menu” software by AOC. i-Menu makes it easy to adjust your monitor display setting by using on
screen menus instead of the OSD button on the monitor. To complete installation, please follow the installation guide.
e-Saver
Welcome to use AOC e-Saver monitor power management software! The AOC e-Saver features Smart Shutdown
functions for your monitors, allows your monitor to timely shutdown when PC unit is at any status (On, Off, Sleep or
Screen Saver); the actual shutdown time depends on your preferences (see example below).
Please click on "driver/e-Saver/setup.exe" to start installing the e-Saver software, follow the install wizard to
complete software installation.
Under each of the four PC status, you may choose from the pull-down menu the desired time (in minutes) for your
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monitor to automatically shutdown. The example above illustrated:
1) The monitor will never shutdown when the PC is powered on.
2) The monitor will automatically shutdown 5 minutes after the PC is powered off.
3) The monitor will automatically shutdown 10 minutes after the PC is in sleep/stand-by mode.
4) The monitor will automatically shutdown 20 minutes after the screen saver appears.
You can click “RESET” to set the e-Saver to its default settings like below.
Screen+
Welcome to "Screen+" software by AOC, Screen+ software is a desktop screen splitting tool, it splits the desktop into
different panes, each pane displays a different window. You only need to drag the window to a corresponding pane,
when you want to access it. It supports multiple monitor display to make your task easier. Please follow the installation
software to install it.
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4. Input/Output Specification
4.1 Input Signal Connector
15-Pin Color Display Signal Cable
Pin No. Signal Name Pin No. Signal Name
1 Video-Red 9 +5V
2 Video-Green 10 Ground
3 Video-Blue 11 N.C.
4 N.C. 12 DDC-Serial data
5 Detect Cable 13 H-sync
6 GND-R 14 V-sync
7 GND-G 15 DDC-Serial clock
8 GND-B
24-Pin Color Display Signal Cable
Pin Number 24-Pin Color Display
Signal Cable
1
2
3 TMDS data 2/4 Shield 15 Ground (for+5V)
4
5
6 DDC Clock 18
7 DDC Data 19 TMDS data 0/5 Shield
8 N.C. 20
9
10
11 TMDS data 1/3 Shield 23 TMDS Clock +
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TMDS data 2－
TMDS data 2＋
TMDS data 4－
TMDS data 4＋
TMDS data 1－
TMDS data 1＋
TMDS data 3－
Pin Number 24-Pin Color Display
Signal Cable
13
14
16 Hot Plug Detect
17
21
22 TMDS Clock Shield
24
TMDS data 3＋
＋5V Power
TMDS data 0－
TMDS data 0＋
TMDS data 5－
TMDS data 5＋
TMDS Clock －
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19-Pin Color Display Signal Cable
Pin No. Signal Name Pin No. Signal Name
1 TMDS Data 2+ 11 TMDS Clock Shield
2 TMDS data 2 Shield 12 TMDS Clock
3 TMDS Data 2 13 CEC
4 TMDS Data 1+ 14 Reserved (N.C. on device
5 TMDS Data 1 Shield 15 SCL
6 TMDS Data 1 16 SDA
7 TMDS Data 0+ 17 DDC/CEC Ground
8 TMDS Data 0 Shield 18 +5V Power
9 TMDS Data 0 19 Hot Plug Detect
10 TMDS Clock +
20-Pin Color Display Signal Cable
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4.2 Preset Display Modes
HDMI/DP Timing
MHL Timing
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4.3 Panel Specification
4.3.1 General Features
4.3.2 Display Characteristics
4.3.3 Electrical Characteristics
TFT LCD MODULE
Back Light Unit
Ta = 25 ºC
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