AOC E2495SD User manual

24" LCD Color Monitor AOC E2495SD
Copyright © 2012 by TPV Corporation. All rights reserved. Specifications are subject to change without notice.
No part of this publication may be reproduced in any form or means, without the prior written permission of TPV Corporation. Otherwise we will
reserve the right to investigate the legal responsibility.
1
Service
Service
Service
HorizontalFrequency
30-83kHz
TABLE OF CONTENTS
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.
Table Of Contents…………………………………………...1
Revision List………………………………………………....2
Important Safety Notice ……..............................……...... 3
1. Monitor Specification..............................…………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instructions....................................…...........6
3.1. General Instructions..........................….....................6
3.2. Control Buttons………………………….…................6
3.3 Adjusting the Picture...................................................8
4. Input/ Output Specification............……………............14
4.1. Input Signal Connector..............……….................14
4.2. Factory Preset Display Modes...........…..................15
4.3. Panel Specification......……..…………..................16
5. Block Diagram….........................................................19
5.1 Main Board……………………………………….…….19
5.2.Power Board……………………………………….......20
6. Schematic……………..............................................21
6.1. Main Board....………............................................21
6.2. Power Board……………………………………....26
6.3. Key Board………………...….……………………28
7. PCB Layout..………….............................................29
7.1. Main Board………................................................29
7.2. Power Board.…....................................................32
7.3. Key Board….........................................................35
8. Maintainability………...............................................36
8.1. Equipments and Tools Requirement.....................36
8.2. Trouble Shooting……….......................................37
9. White-Balance, Luminance Adjustment….…..…...41
10. Monitor Exploded View………….……….…........43
11. BOM List…............................................................45
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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Revision List
Version Release Date Revision History TPV Model Name
A00 Dec.12, 2012 Initial release TKCAUF7BALK2HN

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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 Specification

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2. LCD Monitor Description
The LCD Monitor will contain a main board, a power board and a key board which house the flat panel control logic,
brightnesscontrollogicandDDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
Video signal, DDC
Power Board
Flat Panel and
LED backlight
Main Board RS232 Connector
For white balance
adjustment in
factory mode
HOST Computer
Led Drive
AC-IN
100V~240V
Monitor Block Diagram
Key board

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3. Operation 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 Signal cable from the monitor to the video card.
Press the power button to turn on the monitor position. The power indicator will light up.
3.2 Control Buttons
EXTERNAL CONTROLS
Power
Press the Power button to turn on/off the monitor.
Eco (DCR/I-Care)/-
Press the Eco key continuously to select the Eco mode of brightness and DCR/I-Care on when there is no OSD.
(Eco mode hot key may not be available in all models).
Volume / +
When there is no OSD, Press Volume button to active volume adjustment bar, Press -or + to adjust volume (Only
for the models with speakers).
4:3 or Wide/+
When there is no OSD, press + continuously to change 4:3 or wide image ratio. (If the product screen size is 4:3 or
input signal resolution is wide format, the hot key is disable to adjust. )
Auto / Exit
When there is no OSD, press Auto/ Source button continuously about 3 second to do auto configure.
Source hot key
When the OSD is closed, press Source button will be Source hot key function. Press Source button continuously to
select the input source showed in the message bar, press Menu/Enter button to change to the source selected.

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FRONT PANEL CONTROL
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 it . press - or + to navigate through the sub-menu functions. Once the desired function is highlighted,
press MENU-button to activate it.
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 disable to adjust.
2) If the product screen size is 4:3 or input signal resolution is wide format, the item of "Image Ratio" is disable to
adjust.
3) One of DCR, Color Boost, and Picture Boost functions is active, the other two function is turned off accordingly.

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3.3 Adjusting the Picture
HOW TO ADJUST A SETTING

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4. Input/ Output Specification
4.1 Input Signal Connector
D-Sub 15pin Connector
15
610
11 15
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1 Video-Red 9 +5V
2 Video-Green 10 GND
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
DVI 24pin Connector
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1 TMDS data 2－13 TMDS data 3＋
2 TMDS data 2＋14 ＋5V Power
3 TMDS data 2/4 Shield 15 Ground (for+5V)
4 TMDS data 4－16 Hot Plug Detect
5 TMDS data 4＋17 TMDS data 0－
6 DDC Clock 18
TMDS data 0＋
7 DDC Data 19 TMDS data 0/5 Shield
8 N.C. 20
TMDS data 5－
9 TMDS data 1－21 TMDS data 5＋
10 TMDS data 1＋22 TMDS Clock Shield
11 TMDS data 1/3 Shield 23 TMDS Clock +
12 TMDS data 3－24 TMDS Clock －

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4.2 Factory Preset Display Modes

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4.3. Panel Specification
This specification applies to the 24 inch-FHD Color a-Si TFT-LCD Module M240HW01. The display supports the
FHD - 1920(H) x 1080(V) screen format and 16.7M colors (RGB 6-bits + Hi-FRC data). The light source of this
TFT-LCD module is W-LED. All input signals are 2-channel LVDS interface and this module doesn’t contain a driver
for backlight.
4.3.1 General Feature
- Contrast ratio 1000(typ.)
- Response time 5ms.
- Brightness 200nits.
- Resolutions: 1920 x 1080.
- DE (Data Enable) only mode.
- LVDS (Low Voltage Differential Signaling) interface.
- RoHS compliance.
4.3.2 GENERAL SPECIFICATI0NS
4.3.3 MECHANICAL SPECIFICATIONS

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4.3.4 ELECTRICAL CHARACTERISTICS
Ta = 25 ± 2 ºC
4.3.5 BACKLIGHT UNIT
Ta = 25 ± 2 ºC
Note 1: The specified current is input LED chip 100% duty current.
Note 2: The value showed in the table is one light bar’s operation voltage.
Note 3: Definition of life time : brightness becomes 50% of its original value. The minimum life time of LED unit is on
the condition of IRLED = 60mA and 25±2℃(Room temperature).
Note 4: Each LED light bar consists of 80 pcs LED package (4 strings x 20 pcs / string).

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4.3.6 BLOCK DIAGRAM

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5. Block Diagram
5.1 Main board
PB[0..9]
03.DVI INPUT
03.DVI INPUT
RX0+
RX0-
RX1-
RX1+
RX2+
RX2-
RXC-
RXC+
DDCSCL2
DDCSDA2
DVI_CABLE_DET
EDID_WP
+5V
DVI_HPD
Adj_BACKLIGHT
on_BACKLIGHT
Volume
Mute
PS_EN
Panel_ON
+5V
VCC3.3
VCC1.2
VLCD
VLCD
R0+
R0-
SOG_DET
G0+
G0-
B0-
AHS0
AVS0
DDCSCL1
DDCSDA1
EDID _WP
VGA_C ABLE_DET
PA[0..9]
+5V
EDID_WP
RX0+
RX1-
RX0-
RXC-
RX2+
RX2-
RXC+
RX1+
DDCSCL2
DDCSDA2
DVI_CABLE_DET
+5V
EDID_WP
DVI_HPD
B0+
VCC3.3
VCC1.2
+5V
02.INPUT
02.D-SUB INPUT
R0+
R0-
SOG_DET
G0+
G0-
B0+
B0-
+5V
AHS0
AVS0
DDCSCL1
DDCSDA1
EDID_WP
VGA_CABLE_DET
04.SCALER
04.SCALER
Adj_BACKLIGHT
on_BACKLIGHT
Volume
Mut e
PS_EN
Panel_ON
PB[0..9]
PA[0..9]
R0+
R0-
SOG_DET
G0+
G0-
B0+
B0-
AHS0
AVS0
DDCSCL1
DDCSDA1
EDID_WP
VGA_CABLE_DET
RXC+
RXC-
RX2-
RX2+
RX1+
RX1-
RX0-
RX0+
DDCSCL2
DDCSDA2
DVI_CABLE_DET
DVI_HPD
VCC1.2
VCC3.3
+5V
JV_SDA
JV_SCL
05.PANEL INTERFACE
05.PANEL INTERFACE
VLCD
PA[0..9]
PB[0..9]
JV_SCL
JV_SDA
06.POWER
06.POWER
Adj_BACKLIGHT
on_BACKLIGHT
Volume
Mut e
PS_EN
Panel_ON
+5V
VCC 3.3
VCC 1.2
VLCD

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5.2 Power board
Adapter
Converter
EMI filter
Bridge
Rectifier
and Filter
Start Circuit
PWM
Control IC
Transformer
Diode rectifier
& Filter
AC input
Feedback
Circuit
Over
Voltage
Protect
Diode rectifier
& Filter
+14.5V
+5V
Setup-up Controller
OZ9998BGN
(U801)
+14.5V
ON/OFF
DIM Current Feedback
OVP Circuit
Boost Circuit
LED
panel
(CN804)