24" LCD Color Monitor |
AOC 2436Sa |
Service
Service
Service
Horizontal Frequency
30-80 kHz
TABLE OF CONTENTS
Description Page
Table Of Contents.......…….................……...........…........1
DescriptionTable Of Contents.......…….................……...........…........Page1
Revision List.…........................………................……......2
Revision List.…........................………................……......2
1. Monitor Specification.................................………........4
1.Monitor Specification.................................………........3
2.LCD Monitor Description…………………………….......5
2.LCD Monitor Description…………………………….......4 3. Operation Instruction…………...................…...........6
3. Operation Instruction…………...................…...........5
3.1 General Instructions.....................................…...........6
3.1General Instructions.....................................…...........5
3.2Control Button……………………………..……...........6
3.2Control Button……………………………..……...........5
3.3Adjusting the Picture...........................…............6
3.3 Adjusting the Picture...........................…............5
4. Input/Output Specification............……………............8
4. Input/Output Specification............……………............8
4.1 Input Signal Connector............…..……................8
4.1Input Signal Connector............…..……................8
4.2Factory Preset Display Modes.........................8
4.2 Factory Preset Display Modes......................... |
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5 Panel Specification.....…………………........................9 |
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5 Panel Specification.....…………………........................10 |
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5.1 Display Characteristics………………………………9 |
5.1Display Characteristics………………………………10
5.2Optical Characteristics………………………………..9
5.2Optical Characteristics………………………………..10
5.3Electrical Characteristics……………….…………..10
5.3 Parameter guide line for CCFL Inverter……………..10
6. Block Diagram…….…................………….........11
6 Block Diagram |
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Description |
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6.1Software Flow Chart…….…..........………….........11
6.2Electrical Block Diagram………...………...…......13 7. Schematic……………………………………………. 15
7.1Main Board…………..............................................15
7.2Power Board....……………....................................19 8. PCB Layout..…………........................................22
8.1Main Board……………......................................22
8.2Power Board….....................................................24
8.3Key Board……………….....................................26
8.4USB Board……………..........................................26 9. Maintainability………...............................................27
9.1.Equipments and Tools Requirement.....................27
9.2.Trouble Shooting…………....................................28 10. White-Balance, Luminance adjustment.................34 11. Monitor Exploded View……..……………............36 12. BOM List....……....................................................37
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
1
24" LCD Color Monitor |
AOC 2436Sa |
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.)
2
24" LCD Color Monitor |
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AOC 2436Sa |
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Revision List |
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Version |
Date |
Revision History |
Remark |
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A00 |
June.-04-2010 |
Initial release |
TKAAABNB6WA1UNE |
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3
24" LCD Color Monitor |
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AOC 2436Sa |
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1. Monitor Specification |
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model name |
2436Sa |
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Driving system |
TFT Color LCD |
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Viewable Image Size |
60.9 cm diagonal |
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LCD Panel |
Pixel pitch |
0.2768mm(H) x 0.2768mm(V) |
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Video |
R, G, B Analog lnterface & Digital Interface |
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Separate Sync. |
H/V TTL |
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Display Color |
16.7M Colors |
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Dot Clock |
148.5 MHz |
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Horizontal scan range |
30 kHz - 80 kHz |
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Horizontal scan Size(Maximum) |
531.36mm |
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Vertical scan range |
55 Hz - 75 Hz |
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Vertical scan Size(Maximum) |
298.89mm |
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Optimal preset resolution |
1920 x 1080 (60 Hz) |
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Plug & Play |
VESA DDC2B/CI |
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Resolution |
Input Connector |
D-Sub 15pin |
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Input Video Signal |
Analog: 0.7Vp-p(standard), 75 OHM |
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Power Source |
100-240V~, 50/60Hz |
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Power Consumption |
Typical < 49 W |
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Standby < 1 W |
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USB Downstream port (A type ) |
To USB device, loading < 100mA |
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off timer |
0~24hours |
Select timing to turn off the monitor. |
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Speakers |
2W x 2 |
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Connector Type |
15-pin Mini D-Sub |
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Signal Cable Type |
Detachable |
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Physical |
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Height (with base) |
425.47mm |
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Width |
582.14mm |
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Characteristics |
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Dimensions & Weight: |
Depth |
206mm |
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Weight (monitor only) |
5.5kg |
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Weight (with packaging) |
7.3 kg |
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Temperature: |
Operating |
0° to 40° |
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Non-Operating |
-25°to 55° |
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Environmental |
Humidity: |
Operating |
10% to 85% (non-condensing) |
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Non-Operating |
5% to 93% (non-condensing) |
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Altitude: |
Operating |
0~ 12,000 |
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(3,658 m) |
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Non-Operating |
0~ 40,000 |
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(12,192 m ) |
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4
24" LCD Color Monitor |
AOC 2436Sa |
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.
Monitor Block Diagram
CCFL Driver |
Flat Panel and |
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CCFL backlight |
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Power board |
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Main Board |
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RS232 Connector |
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(Include: adapter, inverter) |
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For white balance |
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adjustment in factory |
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mode |
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Keyboard |
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USB board |
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AC-IN |
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Video signal DDC |
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100V-240V |
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HOST Computer |
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5
24" LCD Color Monitor |
AOC 2436Sa |
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.
3.2Control 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.
Auto / Down Auto configure hot key: When the OSD is closed, press Auto button to do auto configure.
3.3 Adjusting the Picture
6
24" LCD Color Monitor |
AOC 2436Sa |
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.
LED Indicator
7
24" LCD Color Monitor |
AOC 2436Sa |
4. Input/Output Specification
4.1Input Signal Connector
4.1.1D-SUB connector
PIN NO. |
DESCRIPTION |
PI N NO. |
DESCRIPTION |
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1 |
Video-Red |
9 |
+5V |
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2 |
Video-Green |
10 |
Ground |
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3 |
Video-Blue |
11 |
N.C. |
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4 |
N.C. |
12 |
DDC-Serial data |
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5 |
Detect Cable |
13 |
H-sync |
6 |
GND-R |
14 |
V-sync |
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7 |
GND-G |
15 |
DDC-Serial clock |
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8 |
GND-B |
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4.2 Factory Preset Display Modes
STAND |
RESOLUTION |
HORIZONTAL |
VERTICAL |
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FREQUENCY(kHZ) |
FREQUENCY(Hz) |
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VGA |
640×480 @60Hz |
31.469 |
59.94 |
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VGA |
640×480 @67Hz |
35 |
66.667 |
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VGA |
640×480 @72Hz |
37.861 |
72.809 |
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VGA |
640×480 @75Hz |
37.5 |
75 |
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Dos-mode |
720×400 @70Hz |
31.469 |
70.087 |
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SVGA |
800×600 @56Hz |
35.156 |
56.25 |
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SVGA |
800×600 @60Hz |
37.879 |
60.317 |
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SVGA |
800×600 @72Hz |
48.077 |
72.188 |
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SVGA |
800×600 @75Hz |
46.875 |
75 |
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SVGA |
832×624 @75Hz |
49.725 |
74.55 |
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XGA |
1024×768 @60Hz |
48.363 |
60.004 |
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XGA |
1024×768 @70Hz |
56.476 |
70.069 |
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XGA |
1024×768 @75Hz |
60.023 |
75.029 |
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XGA |
1024×768 @75Hz |
60.241 |
74.927 |
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*** |
1280×960 @60Hz |
60 |
60 |
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SXGA |
1280×1024 @60Hz |
63.981 |
60.02 |
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SXGA |
1280×1024 @75Hz |
79.976 |
75.025 |
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WXGA+ |
1440×900 @60Hz |
55.935 |
59.887 |
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WSXGA |
1680X1050 @60Hz |
65.29 |
59.954 |
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HD |
1920×1080@60Hz |
67.5 |
60 |
8
24" LCD Color Monitor |
AOC 2436Sa |
5 Panel Specification
5.1 Display Characteristics
M236H1-L01 is a 23.6” TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins 2ch-LVDS interface. This module supports 1920 x 1080 Full HD mode and can display up to 16.7M colors. The inverter module for Backlight is not built in.
5.2 Optical Characteristics
9
24" LCD Color Monitor |
AOC 2436Sa |
5.3 Electrical Characteristics
1.TFT LCD Module:
2.Back Light Unit:
10
24" LCD Color Monitor |
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AOC 2436Sa |
6. Block Diagram |
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6.1 Software Flow Chart |
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1 |
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2 |
Y |
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3 |
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N |
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4 |
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5 |
N |
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Y |
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6 |
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7 |
N |
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8 |
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Y |
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9 |
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10 |
N |
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11 |
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Y |
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N |
13 |
N |
12 |
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Y |
Y |
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14 |
15 |
N |
16 |
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Y |
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18 |
N |
19 |
Y
11
24" LCD Color Monitor |
AOC 2436Sa |
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?
12
24" LCD Color Monitor |
AOC 2436Sa |
6.2 Electrical Block Diagram
6.2.1 Scalar Board
Crystal 14.31818MHz |
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LCD Interface |
(X401) |
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(CN403) |
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FLASH MEMORY |
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Scalar TSUMU18ER-LF-1 |
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EN25F20-100GCP |
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(Include :MCU,ADC,OSD etc) |
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(U402) |
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(U401) |
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H sync |
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V sync |
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RGB |
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D-Sub |
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Connector |
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(CN101) |
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VGA_SDA,
VGA_SCL
EEPROM M24C02 (U405)
Key Control
Interface
(CN409)
13
24" LCD Color Monitor |
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AOC 2436Sa |
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6.2.2 Inverter / Power Board |
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AC input |
EMI filter |
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Bridge |
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Transformer |
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16V |
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(T901) |
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Rectifier diodes |
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Rectifier,Filter |
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5V |
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Start Circuit |
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(R904,R905) |
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Power Switch |
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PWM Control IC |
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LD7576 |
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(Q901) |
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(IC901) |
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Photocoupler |
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Regulator |
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(IC903) |
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(IC904) |
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MOSFET |
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Output |
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(Q805,Q806) |
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Transformer |
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16V |
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Circuit |
(PT801) |
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Lamp
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PWM Control IC |
ON/OFF |
Feedback |
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ta9687GN |
5V |
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(IC801) |
DIM |
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Circuit |
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PID |
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Audio Power Amplifier |
CN601(Phone Jack) |
+5V |
APA2069JITUL |
CN602 |
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(IC601) |
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14