AOC 2436VH - Operating instructions

24" LCD Color Monitor AOC 2436Vh
1
Service
Service
Service
HorizontalFrequency
30-80 kHz
TABLEOFCONTENTS
Description Page Description Page
Description Page
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
Table Of Contents.......…….................……...........…........1
Revision List.…........................………................……......2
1. Monitor Specification.................................………........3
2.LCD Monitor Description…………………………….......4
3. Operation Instruction…………...................…...........5
3.1 General Instructions.....................................…...........5
3.2 Control Button……………………………..……...........5
3.3 Adjusting the Picture...........................…............5
4. Input/Output Specification............……………............8
4.1 Input Signal Connector............…..……................8
4.2 Factory Preset Display Modes.........................9
5 Panel Specification.....…………………........................10
5.1 Display Characteristics………………………………10
5.2 Optical Characteristics………………………………..10
5.3 Parameter guide line for CCFL Inverter……………..10
6
Block
Diagram
1
1
Table Of Contents.......…….................……...........…........1
Revision List.…........................………................……......2
1. Monitor Specification.................................………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instruction…………...................…...........6
3.1 General Instructions.....................................…...........6
3.2 Control Button……………………………..……...........6
3.3 Adjusting the Picture...........................…............7
4. Input/Output Specification............……………............9
4.1 Input Signal Connector............…..……................9
4.2 Factory Preset Display Modes.........................10
5 Panel Specification.....…………………........................11
5.1 Display Characteristics………………………………11
5.2 Optical Characteristics……………………………….12
5.3 Electrical Characteristics……………….…………..13
6. Block Diagram…….…................………….........15
6.1 Software Flow Chart…….…..........………….........15
6.2 Electrical Block Diagram………...………...…......17
7. Schematic……………………………………………. 19
7.1 Main Board…………..............................................19
7.2 Power Board....……………....................................25
8. PCB Layout..…………............................................27
8.1 Main Board……………......................................27
8.2 Power Board….....................................................29
8.3 Key Board……………….....................................31
8.4 USB Board……………..........................................31
9. Maintainability………...............................................32
9.1. Equipments and Tools Requirement.....................32
9.2. Trouble Shooting…………....................................33
10.Firmware and DDC Instruction………………….….39
11. White-Balance, Luminance adjustment.................40
12. Monitor Exploded View……..……………............42
13. BOM List....……....................................................43

24" LCD Color Monitor AOC 2436Vh
2
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 might 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 radiations 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.)

24" LCD Color Monitor AOC 2436Vh
3
Revision List
Version Date Revision History Remark
A00 May.-28-2010 Initial release
HKAASBNK6WA1PNE
HKAASBNL6W3APNE
A01 Aug.-26-2010 Add new Models
HKAASBNK6WA3PNE
HKAASBNK6WA2PNE

24"LCDColorMonitor AOC2436Vh
4
1. Monitor Specification
LCD Panel
Model name 2436Vh
Driving system TFT Color LCD
Viewable Image Size 60.9 cm diagonal
Pixel pitch 0.2715mm(H) x 0.2715mm(V)
Video R, G, B Analog lnterface & HDMI
Separate Sync. H/V TTL
Display Color 16.7M Colors
Dot Clock 148.5 MHz
Resolution
Horizontal scan range 30 kHz - 80 kHz
Horizontal scan Size(Maximum) 521.28mm
Vertical scan range 55 Hz - 75 Hz
Vertical scan Size(Maximum) 298.89 mm
Optimal preset resolution 1920 x 1080 (60 Hz)
Highest preset resolution 1920 x 1080 (60 Hz)
Plug & Play VESA DDC2B/CI
Input Connector D-Sub 15pin & HDMI
Input Video Signal Analog: 0.7Vp-p(standard), 75 OHM, HDMI
Power Source 100-240V~, 50/60Hz
Power Consumption Typical < 49 W
Standby < 1 W
USB Downstream port (A type ) To USB device, loading < 100mA
off timer 0~24hours Select timing to turn off the monitor.
Speakers 2W x 2
Physical
Characteristics
Connector Type 15-pin Mini D-Sub & HDMI
Signal Cable Type Detachable
Dimensions & Weight:
Height (with base) 425.47 mm
Width 582.14mm
Depth 206mm
Weight (monitor only) 5.5 kg
Weight (with packaging) 7.3 kg
Environmental
Temperature: Operating 0° to 40°
Non-Operating -25°to 55°
Humidity: Operating 10% to 85% (non-condensing)
Non-Operating 5% to 93% (non-condensing)
Altitude: Operating 0~ 12,000 ft (3,658m )
Non-Operating 0~ 40,000 ft (12,192m )

24" LCD Color Monitor AOC 2436Vh
5
2. LCD Monitor Description
The LCD MONITOR will contain a main board, a power board, an audio board and a key board which house the flat
panel control logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
HOST Computer
AC-IN
100V-240V
Power board
(Include: adapter, inverter)
Flat Panel and
CCFL backlight
Main Board RS232 Connector
For white balance
adjustment in factory
mode
CCFL Driver
Video signal DDC
Monitor Block Diagram
Key board USB Board

24" LCD Color Monitor AOC 2436Vh
6
3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the
monitor.
By changing these settings, the picture can be adjusted to your personal preferences.
-The power cord should be connected.
-Connect the video cable from the monitor to the video card.
-Press the power button to turn on the monitor, the power indicator will light up.
3.2 Control Buttons
Power Press to turn on or turn off the monitor.
(4 : 3 or wide) / Up Press key to change the screen aspect ratio between standard 4:3 format or Wide
format.
Source hot key : When the OSD is closed, press button will be Source hot key function (Only for the models with
dual or more inputs) .Press Source button continuously to select the input source showed
in the message bar , press Menu/Enter button to change to the source selected.
Auto / Down Auto configure hot key: When the OSD is closed, press Auto button to do auto configure.

24" LCD Color Monitor AOC 2436Vh
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3.3 Adjusting the Picture
Eco mode ---DCR, Standard, Text, Internet, Game, Movie, Sports
Notes : When Eco mode is not set as “Standard”, Contrast and Brightness can not be adjusted; When DCR is set as
“On”, Contrast, Brightness, Eco mode and Gamma can not be adjusted.
Color Boost --- Full Enhance, Nature Skin, Sky-Blue, Green Field, Auto Detect, Demo, Off, Exit
Notes :
Full Enhance: Total color saturation is enhanced, suitable for vivid pictures.
Natural Skin: Suitable for human portrait.
Green Field: Suitable for large area of green.
Sky Blue: Suitable for sky or ocean scene.
Auto Detect: Suitable for outdoor or garden.
Demo: Screen divided into two for comparison purpose.

24" LCD Color Monitor AOC 2436Vh
8
Luminance ---Brightness,Contrast, Gamma
Notes : When Eco mode is not set as “Standard”, Contrast and Brightness can not be adjusted; When DCR is set as
“On”, Contrast, Brightness, Eco mode and Gamma can not be adjusted.
Image Setup --- Clock, Phase, H.Position, V.Position, Exit
Notes : When the input source is digital signal like DVI or HDMI, Image Setup can not be adjusted.
Color Temperature ---User-R , User-G , User-B, Normal, Warm, Cool, sRGB, Exit
Notes :
One of DCR, Color Boost, and Picture Boost functions is active, the other two function is turned off accordingly.
Picture Boost --- V.Position, H.Position, Contrast, Brightness, Frame Size, Bright Frame, Exit
Extra ---Language, Reset, DDC-CI,OSD Timeout, Transparency, V. Position, H. Position, Off Timer,
Notes :
One of DCR, Color Boost, and Picture Boost functions is active, the other two function is turned off accordingly.
Exit
LED Indicator

24" LCD Color Monitor AOC 2436Vh
9
4. Input/Output Specification
4.1 Input Signal Connector
4.1.1 D-SUB connector
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
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
4.1.2 HDMI connector
Pin No. Signal Name Pin No. Signal Name Pin No. Signal Name
1 TMDS Data 2+ 9 TMDS Data 0 17 DDC/CEC Ground
2 TMDS Data 2 Shield 10 TMDS Clock + 18 +5V Power
3 TMDS Data 2 11 TMDS Clock Shield 19 Hot Plug Detect
4 TMDS Data 1+ 12 TMDS Clock
5 TMDS Data 1Shield 13 CEC
6 TMDS Data 1 14 Reserved (N.C. on device
7 TMDS Data 0+ 15 SCL
8 TMDS Data 0 Shield 16 SDA

24" LCD Color Monitor AOC 2436Vh
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4.2 Factory Preset Display Modes
STAND RESOLUTION
HORIZONTAL
FREQUENCY(kHZ)
VERTICAL
FREQUENCY(Hz)
VGA 640×480 @60Hz 31.469 59.94
VGA 640×480 @67Hz 35 66.667
VGA 640×480 @72Hz 37.861 72.809
VGA 640×480 @75Hz 37.5 75
Dos-mode 720×400 @70Hz 31.469 70.087
SVGA 800×600 @56Hz 35.156 56.25
SVGA 800×600 @60Hz 37.879 60.317
SVGA 800×600 @72Hz 48.077 72.188
SVGA 800×600 @75Hz 46.875 75
SVGA 832×624 @75Hz 49.725 74.55
XGA 1024×768 @60Hz 48.363 60.004
XGA 1024×768 @70Hz 56.476 70.069
XGA 1024×768 @75Hz 60.023 75.029
XGA 1024×768 @75Hz 60.241 74.927
*** 1280×960 @60Hz 60 60
SXGA 1280×1024 @60Hz 63.981 60.02
SXGA 1280×1024 @75Hz 79.976 75.025
WXGA+ 1440×900 @60Hz 55.935 59.887
WSXGA 1680X1050 @60Hz 65.29 59.954
HD 1920×1080@60Hz 67.5 60

24" LCD Color Monitor AOC 2436Vh
11
5 Panel Specification
5.1 Display Characteristics
Ta= 25℃

24" LCD Color Monitor AOC 2436Vh
12
5.2 Optical Characteristics
Ta= 25℃

24" LCD Color Monitor AOC 2436Vh
13
5.3 Electrical Characteristics
1.TFT LCD Module:
Note 1：Measurement conditions:
The duration of rising time of power input is 470 us:

24" LCD Color Monitor AOC 2436Vh
14
2.Back Light Unit:
Ta= 25℃

24" LCD Color Monitor AOC 2436Vh
15
6. Block Diagram
6.1 Software Flow Chart
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N
16
17
19
Y
N
18

24" LCD Color Monitor AOC 2436Vh
16
REMARK:
1) MCU initialize.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEprom.Turn on the LED and set it to green color. Scalar initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are they’re any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?

24" LCD Color Monitor AOC 2436Vh
17
6.2 Electrical Block Diagram
6.2.1 Scalar Board
FLASH MEMORY
SST25LF020A
(U
4
0
2
)
Scalar TSUMU58KDT-LF-1
(Include :MCU,ADC,OSD etc)
(U401)
LCD Interface
(CN404)
D-Sub
Connector
(CN101)
H sync
V sync
RGB
EEPROM
AT24C02N
(U101)
VGA_SDA
VGA_SCL
Crystal 14.31818MHz
(X401)
EEPROM
M24C04
(
U403
)
HDMI
Connector
(CN501)
EEPROM
AT24C02N
(U102)
HDMI1_SCL
HDMI1_SDA
Key Control Interface
(CN403)

24" LCD Color Monitor AOC 2436Vh
18
6.2.2 Inverter / Power Board
EMI filter
Start Resistor
(R904,R905)
PWM Control
LD7576
(IC901)
Transformer
(T901)
AC input
5V
ON/OFF
+5V
DIM
PID
Feedback
Circui
t
Transformer
(PT801)
MOSFET
(Q805,Q806)
Lamp
16V
Bridge
Rectifier
and Filter
Feedback
Circuit
Rectifier
diodes
Output
Circui
t
PWM Control
TA9687GN
(IC801)
Power Switch
(Q901)
Photo coupler
(IC903)
16V
Regulator
(IC904)

24" LCD Color Monitor AOC 2436Vh
19
7. Schematic
7.1 Main Board
715G3262 2
+
C712
100uF/ 16V
on_PANEL4
on_BACKLIGHT 4
VCC1.2 4
C713
0.1uF 16V
ON/OFF
R708 100K--68K
R712 NC--47K
improve I-rush
current
VCC1.2
U702
AP1117E33LA
VSS
1
VOUT 2 VIN
3
TO-252
U703
VI
3VO 2
GND
1
U704
VI
3VO 2
GND
1
OE M MOD EL Size
Rev
Date
Sheet of
TPV MODEL
PCB NAME
称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹 E
B
27Thursday , J une 11, 2009
715G3262-2 <
称爹 >
2.0. POWER
G3262-2-X-X-1-090401
C701
0.1uF 16V
CN701
CONN
1
2
3
4
5
6
7
8
9
10
DIM
R711
10K 1/16W 5%
R706
10K 1/16W 5%
C705
0.1uF 16V
R707
10K 1/16W 5%
C710
0.22uF
R705 22K 1/16W 5%
R708 68K OHM 1/16W
C709
0.1uF 16V
R703
10K 1/16W 5%
Q702
AO3401
C711
10uF/ 10V
R704
10K 1/16W 5%
 NC/G1084-33T43Uf
VOUT 2 VIN
3
GND
1
C704
0.1uF 16V
Q703
2N3906S-RTK/PS
R709 22K 1/16W 5%
C708
0.1uF 16V
R702 100R 1/16W 5%
Q701
2N3904S-RTK/PS
R701
10K 1/16W 5%
+5V
VCC3.3 +5V
VCC3.3
+5VVLCD
+5V1
VCC3.3
VCC3.3
+5V
TO-252
lay
lay
2436vwh
Adj_BACKLIGHT 4
R710
3.3 OHM 2W
U301
NC/AO4411
S
1S 2S 3G 4
D8 D7 D6 D5
R712
NC/47K 1/16W 5%
+5V
+ C702
100uF/16V
+
C703
100uF/ 16V
FB410
120 OHM
1 2

24" LCD Color Monitor AOC 2436Vh
20
Close to CN101
RED-
VGA5V
BLUE+
HSI
VSI
C115
0.22uF
GREEN+
OEM MOD EL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME 称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹 E
B
37Thursday , June 11, 2009
715G3262-2 <
称爹 >
3.0.INPUT
G3262-2-X-X-1-090401
VSY NC 4
RED+
GREEN-
+5V
BLUE-
VGA_DET
R133
4K7 1/16W 5%
R131
4K7 1/16W 5%
D102
BAV70
3
1 2
VGA5V
VGA_SCL
VGA_SCL
VGA_SDA
C102 0.047uF
R114
2K2 1/16W 5%
R107
75R 1/16W 5%
C110
22pF
C106 0.047uF
R104 470R 1/16W 5%
C109
22pF
FB102 0R05 1/16W
R103 56 OH M 1/16W
R116 100R 1/16W 5%
CN101
DB15
1
6
2
7
3
8
4
9
5
11
12
13
14
15
10
1716
FB101 0R05 1/16W
R108 100R 1/16W 5%
C104 1000pF
C111
NC
C101 0.047uF
FB103 0R05 1/16W
R102 56 OH M 1/16W
R106
75R 1/16W 5%
C103 0.047uF
DDC_WP6
C105 0.047uF
R115 100R 1/16W 5%
R109 100R 1/16W 5%
C108
NC
C107 0.047uF
R101 56 OH M 1/16W
R110 100R 1/16W 5%
R105
75R 1/16W 5%
R111 1K 1/16W 5%
ZD102
RLZ5.6B
R112 1K 1/16W 5%
FB104 120 OHM
R113
2K2 1/16W 5%
GNDR 4
HSYNC 4
SOG 4
DDCA_SDA4
RIN 4
VGA5V
DDCA_SCL4
GIN 4
BIN 4
GNDG 4
HSI
VGAESD
GNDB 4
VGAESD
VGA_SDA
R132
10K 1/16W 5%
2436vwh
VGAESD
VSI
BLUE+GREEN+
RED+
候綼 U101
U101
AZC199-04S
I/O1
1
GND
2
I/O2
3I/O3 4
VDD 5
I/O4 6
U102
AZC199-04S
I/O1
1
GND
2
I/O2
3I/O3 4
VDD 5
I/O4 6
U106
AT24C02N-10SU-2.7
A0 1
A1 2
A2 3
GND 4 SDA
5SCL
6WP
7VCC
8
VGA_DET 4
Close to CN101
VGA_DET
候綼 U103