AOC 2436Sa Schematic

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.........................	9
5 Panel Specification.....…………………........................9
5 Panel Specification.....…………………........................10
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

11

Description

Page

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

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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.)

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24" LCD Color Monitor				AOC 2436Sa
			Revision List
	Version	Date	Revision History	Remark
	A00	June.-04-2010	Initial release	TKAAABNB6WA1UNE

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	24" LCD Color Monitor					AOC 2436Sa
	1. Monitor Specification
		model name	2436Sa
		Driving system	TFT Color LCD
		Viewable Image Size	60.9 cm diagonal
	LCD Panel	Pixel pitch	0.2768mm(H) x 0.2768mm(V)
		Video	R, G, B Analog lnterface & Digital Interface
		Separate Sync.	H/V TTL
		Display Color	16.7M Colors
		Dot Clock	148.5 MHz
		Horizontal scan range	30 kHz - 80 kHz
		Horizontal scan Size(Maximum)	531.36mm
		Vertical scan range	55 Hz - 75 Hz
		Vertical scan Size(Maximum)	298.89mm
		Optimal preset resolution	1920 x 1080 (60 Hz)
		Plug & Play	VESA DDC2B/CI
	Resolution	Input Connector	D-Sub 15pin
		Input Video Signal	Analog: 0.7Vp-p(standard), 75 OHM
		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
		Connector Type	15-pin Mini D-Sub
		Signal Cable Type	Detachable
	Physical		Height (with base)	425.47mm
			Width	582.14mm
	Characteristics
		Dimensions & Weight:	Depth	206mm
			Weight (monitor only)	5.5kg
			Weight (with packaging)	7.3 kg
		Temperature:	Operating	0° to 40°
			Non-Operating	-25°to 55°
	Environmental	Humidity:	Operating	10% to 85% (non-condensing)
			Non-Operating	5% to 93% (non-condensing)
		Altitude:	Operating	0~ 12,000	ft	(3,658 m)
			Non-Operating	0~ 40,000	ft	(12,192 m )

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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
		CCFL backlight

Power board
						Main Board					RS232 Connector
(Include: adapter, inverter)
											For white balance
											adjustment in factory
											mode
			Keyboard			USB board
AC-IN									Video signal DDC
100V-240V
							HOST Computer

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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

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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

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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
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

4.2 Factory Preset Display Modes

	STAND	RESOLUTION	HORIZONTAL	VERTICAL
			FREQUENCY(kHZ)	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

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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

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24" LCD Color Monitor

AOC 2436Sa

5.3 Electrical Characteristics

1.TFT LCD Module:

2.Back Light Unit:

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

18	N
	19

Y

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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?

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24" LCD Color Monitor

AOC 2436Sa

6.2 Electrical Block Diagram

6.2.1 Scalar Board

Crystal 14.31818MHz		LCD Interface
(X401)		(CN403)

FLASH MEMORY			Scalar TSUMU18ER-LF-1
EN25F20-100GCP			(Include :MCU,ADC,OSD etc)
(U402)
				(U401)
			H sync
			V sync
			RGB
			D-Sub
			Connector
			(CN101)

VGA_SDA,

VGA_SCL

EEPROM M24C02 (U405)

Key Control

Interface

(CN409)

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24" LCD Color Monitor									AOC 2436Sa
6.2.2 Inverter / Power Board
AC input	EMI filter			Bridge			Transformer			16V
							(T901)		Rectifier diodes
				Rectifier,Filter						5V
				Start Circuit
				(R904,R905)

				Power Switch
PWM Control IC
LD7576				(Q901)
(IC901)
				Photocoupler		Regulator
				(IC903)		(IC904)

				MOSFET
	Output			(Q805,Q806)
			Transformer
				16V
	Circuit		(PT801)

Lamp

		PWM Control IC	ON/OFF
Feedback		ta9687GN	5V
		(IC801)	DIM
Circuit
			PID

	Audio Power Amplifier	CN601(Phone Jack)
+5V	APA2069JITUL	CN602
	(IC601)

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