AOC 916VWA User manual

19" LCD Color Monitor AOC 916Vwa
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Service
Service
Service
HorizontalFrequency
31-80kHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSONATTEMPTING 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
1. Monitor Specification..............................…………........3
2. LCD Monitor Description…………………………….......4
3. Operation Instructions....................................…...........5
3.1. General Instructions...........................…....................5
3.2. Control Button…………………………….…...............5
3.3 Adjusting the Picture...........................…..............6
4. Input/Output Specification............……………............8
4.1. Input Signal Connector............………….................8
4.2. Factory Preset Display Modes......…..................9
4.3. Panel Specification.....………………..................10
5. Block Diagram….........................................................12
5.1 Software Flow Chart………………………….……….12
5.2. Electrical Block Diagram…………………….......14
6. Schematic……………..............................................16
6.1 Main Board....……….............................................16
6.2 Power Board………………………………………....22
6.3 Key Board…………………...….……………………24
7. PCB Layout..………….............................................25
7.1. Main Board………................................................25
7.2. Power Board….....................................................27
7.3. Key Board….........................................................28
8. Maintainability………...............................................29
8.1. Equipments and Tools Requirement.....................29
8.2. Trouble Shooting……….......................................30
9. White-Balance, Luminance adjustment…………...36
10. Monitor Exploded View…………………….…........38
11. BOM List…............................................................39
12. Different Parts List………………………..…………51
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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Revision List
Version Date Revision History TPV Model Name
A00 Nov.-27-07 Initial release T97MRHDLAWCKDN
T97MRHDBAWA3DN
A01 Mar-25-08 Add new BOM T97TRHDBAWA6DN
T9RMRHDCAWVODN
A02 Aug-19-2008 Add new BOM T9RMRHDCAWVYDN
A03 Sep-28-2008 Add new BOM T97MRHDCAWSPDN
T9RTRHNCAWVODN
A04 Dec-26-2008 Add new BOM T9RTRHNCAWVYDN
T97MRHDCAWA2DN
T9RTRHNCAWA4DN
A05 Nov. 09,2009 Add new BOM
T9RMRHNCAWA4DN

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1. Monitor Specification
Driving system TFT Color LCD
Size 48.0cm ( 19" 16:10)
Pixel pitch 0.285mm(H) x 0.285mm(V)
Dot Clock 135 MHz
LCD Panel
Display Colors 16.2M Colors
Video R, G, B Analog Interface
Separate Sync. H/V TTL
H-Frequency 31 – 80 kHz Multi- frequency monitor
Horizontal scan
Size(Maximum) 410.4mm
V-Frequency 55 - 75 Hz modes within these parameters
Input
Vertical scan
Size(Maximum) 256.5mm
Max. Resolution 1440 x 900 (60 Hz)
Plug & Play VESA DDC2BTM
ON Mode 37W
Power
Consumption saving mode < 2 W
Input Connector 15-pin D-Sub, DVI
Input Video Signal Analog: 0. 7Vp-p(standard),
75 OHM, Positive, DVI
Power Source 100~240VAC,47~63Hz
Height (with base) 362.9mm
Width 438.5 mm
Dimension
Depth 209.86mm
Weight (monitor only) 4.4 kg
Weight (with packaging) 5.8 kg
Environmental
Temperature: Operating 0° to 50°
Humidity: Operating 10% to 85% (non-condensing)
Altitude: Operating 0~ 3000m (0~ 10000 ft )

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2. LCD Monitor Description
The LCD Monitor will contain main board, power board, key board which house the flat panel control logic,
brightnesscontrollogicandDDC.
The power board will provideAC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
Video signal, DDC
Power Board
(
Include ada
p
ter and inverter
)
Flat Panel and
CCFL backlight
Main Board RS232 Connector
For white balance
adjustment in
factory mode
HOST Computer
CCFT 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 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
1. Auto Config
2. Volume / -
3. Volume / +
4. Menu / Enter
5. Power Button & Indicator

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3.3 Adjusting the Picture
OSD Settings
xPress the MENU-button to activate the OSD window.
xPress+ or - to navigate through the functions. Once the desired function is highlighted, press the
MENU-button to activate it. If the function selected has a sub-menu, press or again to navigate through the
sub-menu functions. Once the desired function is highlighted, press MENU-button to activate it.
xPress+ or - to change the settings of the selected function. To exit and save, select the exit function. If you
want to adjust any other function, repeat steps 2-3.
xOSD 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.
xPress Exit key continually for 7 sec. to turn on or off DDC-CI.
OSD functions

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4. Input/Output Specification
4.1 Input Signal Connector
D-Sub mini 15pin Connector

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4.2 Factory Preset Display Modes

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4.3. Panel Specification
4.3.1 General Feature
M190A1-L07 is a 19” wide TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins 2ch-LVDS
interface. This module supports 1440 x 900 WXGA+ mode and can display 16.7M colors. The inverter module for
Backlight is not built in.
4.3.2 Optical Characteristics

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4.3.3 Electrical Characteristics
TFT Module
Back-light

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5. Block Diagram
5.1 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
N16
17
19
Y
N
18

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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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5.2 Electrical Block Diagram Main Board
MCU
RTD 2120L
(U401)
Scalar IC RTD2525L
(Include ADC, OSD)
(U501)
EEPROM
AF24BC16
(U403)
D-Sub Connector
(CN301)
H sync
V sync
RGB
EPR_SDA
EPR_SCL
LCD Interface
(CN601)
Key Control Interface
(
CN202
)
Crystal 24MHZ
(X401)
DVI Connector
(CN302)

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Power Board
EMI filter Bridge
Rectifier and
Filter
Start Circuit
R904, R932, R933
PWM
Control IC
Transformer
Feedback
circuit
Rectifier
Diodes
AC input
5V
12V
ON/OFF
Control
PWM
Control IC
Feedback
Circuit
OSC and
Output DC
Convert
MOSFET
Q802, Q803
Over Voltage
protect
Lamp
ON/OFF
DIM
CN902

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6. Schematic 6.1 Main Board (715G2507)

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