AOC Wipro WLA171t User manual

17” LCD Color Monitor Wipro WLA171t
1
Service
Service
Service
Horizontal Frequency
30kHz – 80kHz
TABLEOFCONTENTS
Description Page Description Page
N
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 Instruction…………...............……...........6
3.1 General Instructions...........................…...........6
3.2 Control Button…………….…..............……...............6
3.3 Adjusting the Picture...........................…............8
4. Input/Output Specification............……………............11
4.1 Input Signal Connector............………….................11
4.2 Factory Preset Display Modes.........................11
4.3 Panel Specification.....………………..................12
5. Block Diagram……...................…………................14
5.1 Software Flow Chart….………………..…….….......14
5.2 Electrical Block Diagram….……………..….....…...16
6.Schematic……………....................................…18
6.1 Main Board.……...……..........................................18
6.2 Power Board..………..……..................................24
6.3 Audio Board..………..…….................................26
7.PCB Layout..……………….......................................27
7.1 Main Board…………….........................................27
7.2 Power Board…..……….................................29
7.3 Audio Board……………...…..................................31
7.4 Key Board……………...…....................................31
8.Maintainability……….....................................32
8.1 Equipments and Tools Requirement……..............32
8.2 Trouble Shooting…….………..............................33
9. White-Balance, Luminance adjustment.............39
10. Monitor Exploded View……….……………............40
11. BOM List……….....................................................42
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

17” LCD Color Monitor Wipro WLA171t
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Revision List
Revision Date Revision History TPV Model
A00 Mar.-02-07 Initial Release T76CM4HCALWNE

17” LCD Color Monitor Wipro WLA171t
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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.)

17” LCD Color Monitor Wipro WLA171t
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1. Monitor Specifications
Driving system TFT Color LCD
Size 43.2cm(17.0")
Pixel pitch 0.264mm( H ) × 0.264mm( V )
Viewable angle 160°(H) 160°(V)
LCD Panel
Response time 5 ms
Video R,G,B Analog Interface
Separate Sync. H/V TTL
H-Frequency 30kHz – 80kHz
Input
V-Frequency 50-75Hz
Display Colors 16.2M Colors
Dot Clock 135MHz
Max. Resolution 1280 × 1024 @75Hz
Plug & Play VESA DDC2BTM
ON Mode ≤37W
EPA ENERGY STAR®OFF Mode ≤1W
Input Connector 15-pin D-Sub
Input Video Signal Analog:0.7Vp-p(standard),
75 OHM, Positive
Maximum Screen Size Horizontal : 338mm
Vertical : 270mm
Power Source 100~240VAC,47~63Hz
Environmental
Considerations
Operating Temp: 5° to 35°C
Storage Temp.: -20° to 60°C
Operating Humidity: 10% to 85%
Dimension 376(W)×382(H)×163(D)mm
Weight (N. W.) 4.2kg Unit (net)
Audio Output Rated Power 1.5W rms
(Per channel)
Regulatory Compliance FCC, MPRII, cULus

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2. LCD Monitor Description
The LCD monitor will contain a main board, a power board, a key board and an audio 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
HOST Computer
AC-IN
100V-240V
Power board
(
Include: ada
p
ter
,
inverter
)
Flat Panel and
CCFL backlight
Main Board RS232 Connector
For white balance
adjustment in factory
mode
CCFL Drive.
Video signal,
Key board Audio board

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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 (See Figure 3). 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 position. The power indicator will light up.
3.2 Control Buttons
External Controls
1. Auto Adjust Key/Exit 2. Volume
3. Power Button/ LED 4. Volume
5. MENU / ENTER 6.
1. D-Sub Cable
2. AC Power Cord
3. Audio Cable

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Front Panel Control
•Power Button:
Press this button to turn the monitor ON or OFF.
•Power Indicator:
Green — Power On mode.
Orange — Off mode.
•MENU / ENTER:
Activate OSD menu when OSD is OFF or activate/de-activate adjustment function when OSD is ON or Exit OSD
menu when in Brightness /Contrast Adjust OSD status.
•Volume:
Increase volume or adjust function.
•Volume:
Decrease volume or adjust function.
•Auto Adjust button / Exit:
1. When OSD menu is in active status, this button will act as EXIT-KEY (EXIT OSD menu).
2.When OSD menu is in off status, press this button for 2 seconds to activate the Auto Adjustment function.
The Auto Adjustment function is used to set the HPos, VPos, Clock and Focus.
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
•Do not install the monitor in a location near heat sources such as radiators or air ducts, or in a place subject to
direct sunlight, or excessive dust or mechanical vibration or shock.
•Save the original shipping carton and packing materials, as they will come in handy if you ever have to ship your
monitor.
•For maximum protection, repackage your monitor as it was originally packed at the factory.
•To keep the monitor looking new, periodically clean it with a soft cloth. Stubborn stains may be removed with a
cloth lightly dampened with a mild detergent solution. Never use strong solvents such as thinner, benzene, or
abrasive cleaners, since these will damage the cabinet. As a safety precaution, always unplug the monitor before
cleaning it.

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3.3 Adjusting The Picture
Press the MENU-button to activate the OSD window.
1. Press
< 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.
2. Press
< or > to change the settings of the selected function.
3. To exit and save, select the exit function. If you want to adjust any other function, repeat steps 2-3.

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Adjusting The Picture
The descriptions for function control LEDS
Main Menu
Item
Main
Menu
Icon
Sub Menu
Item Sub Menu Icon Description
Contrast
Contrast from Digital-register.
Luminance
Brightness
Backlight Adjustment
Focus
Adjust Picture Phase to reduce Horizontal-Line noise
Image Setup
Clock
Adjust picture Clock to reduce Vertical-Line noise.
H. Position
Adjust the horizontal position of the picture.
Image Position
V. Position
Adjust the vertical position of the picture.
Warm N/A Recall Warm Color Temperature from EEPROM.
Cool N/A Recall Cool Color Temperature from EEPROM.
sRGB N/A Recall sRGB Temperature from EEPROM.
User / Red
Red Gain from Digital-register.
User / Green
Green Gain Digital-register.
Color Temp.
User / Blue
Blue Gain from Digital-register.
Yes N/A Auto Adjust the H/V Position, Focus and Clock of
picture.
Auto Config
No N/A Do not execute Auto Config, return to main menu.

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Main
Menu
Item
Main
Menu
Icon
Sub Menu
Item Sub Menu Icon Description
H. Position
Adjust the horizontal position of the OSD.
V. Position
Adjust the vertical position of the OSD.
OSD
Setup
OSD Timeout
Adjust the OSD timeout.
Language
Language N/A Select the language you like.
Informatio
n
Information N/A Show the resolution, H/V frequency and input port of
current input timing.
Yes N/A Clear each old status of Auto-configuration.
Reset
No N/A Do not execute reset, return to main menu.
Exit
N/A N/A Exit OSD

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4. Input/Output Specification
4.1 Input Signal Connector
Pin No. Description Pin No. Description
1. Red Video 9. + 5V
2. Green Video 10. Detect Cable
3. Blue Video 11. RXD
4. TXD 12. DDC-Serial Data
5. Ground 13. H-Sync
6. Red Ground 14. V-Sync
7. Green Return 15. DDC-Serial Clock
8. Blue Return
Analog Connector
15
610
11 15
4.2 Factory Preset Display Modes
Standard Resolution Horizontal
Frequency
Vertical
Frequency
Dos-mode 720 × 400 31.47kHz 70Hz
640 × 480 31.47kHz 60Hz
640 × 480 35.00kHz 66.6Hz
640 × 480 37.50kHz 75Hz
VGA
640 × 480 37.86kHz 72Hz
800 × 600 37.879kHz 60Hz
800 × 600 46.875kHz 75Hz
800 × 600 35.16kHz 56Hz
800 × 600 48.01kHz 72Hz
SVGA
832 × 624 49.725kHz 75Hz
1024 × 768 48.363kHz 60Hz
1024 × 768 56.476kHz 70Hz
XGA
1024 × 768 60.02kHz 75Hz
1280 × 1024 64.00kHz 60Hz
SXGA
1280 × 1024 80.00kHz 75Hz

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4.3 Panel Specification
CLAA170EA07P is 17.0” color TFT-LCD (Thin Film Transistor Liquid Crystal Display) module composed of LCD
panel, driver ICs, control circuit and backlight. By applying 8 bit digital data, 1280×1024, 16.2M-color images are
displayed on the 17.0” diagonal screen. Input power voltage is 5.0V for LCD driving. Inverter for backlight is not
included in this module.
4.3.1 Display Characteristics
4.3.2 Optical Characteristics
Ta=25℃，VCC=5.0V

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4.3.3. Electrical Characteristics
(1)TFT-LCD
(2)Backlight

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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

17” LCD Color Monitor Wipro WLA171t
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1) MCU initializes.
2) Is the EPROM blank?
3) Program the EPROM by default values.
4) Get the PWM value of brightness from EPROM.
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 EPROM.
Turn on the LED and set it to green color.
Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there 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
disappears.
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?

17” LCD Color Monitor Wipro WLA171t
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5.2 Electrical Block Diagram
5.2.1 Main Board
MCU
W78E065A40PL
(U601)
Scalar IC TSU16AK
(Include ADC, OSD)
(U401)
D-Sub
Connector
(CN301)
EEPROM
M24C02
(U301)
H sync
V sync
RGB
DB15_SDA,
DB15_SCL
Panel Interface
(CN503)
OSD Control
Interface
(CN602)
Crystal
14.318MHZ
(X401)
EEPROM
M24C16
(U602)
Crystal
20MHz
(X601)

17” LCD Color Monitor Wipro WLA171t
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5.2.2 Power Board
CN102
EMI filter
Bridge
Rectifier
and Filter
Start Circuit: R906、R907
PWM
Control IC
Transformer
Over
Voltage
Protect
Rectifier
diodes
AC input
12V
ON/OFF Control
PWM
Control IC
Feedback
Circuit
Output
Circuit
Transformer MOSFET
Q203、Q204
Lamp
ON/OFF
DIM
PWM
Feedback
Circuit

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6. Schematic
6.1 Main Board
B4
2.POWER
onPanel_5V/3.3V
onBACKLITE
AdjBACKLITE
VCC3.3
VCC2.5
VAA1
VAA2
VAA3
VAA4
VCC5V
VCC12V
VLCD
VCPU
VLCD
VCC5V
VCC2.5
VAA1
B2
4.SCALER
RIN
GIN
SOG
BIN
GNDR
GNDG
GNDB
HSYNC
VSYNC
R+
R-
G-
G+
B+
B-
CLK+
CLK-
CSZ
SCL
SDA
HWRESET
INT
Volume
AdjBACKLITE
PA[0..9]
PB[0..9]
VCC2.5
VCC3.3
VAA1
VAA2
VAA3
VAA4
AD0
AD1
AD2
AD3
VAA1
VLCD
B5
5.PANEL INTERFACE
VLCD
PB[0..9]
PA[0..9]
VCC3.3
VAA2
B1
3.INPUT
RIN
GIN
BIN
VSYNC
GNDR
GNDG
GNDB
ST_DET1 HSYNC
SOGDDC_CLK
DDC_DAT
ST_DET2
R+
R-
G-
G+
B+
B-
CLK+
CLK-
TXD
RXD
TOP
D
TSU16AK
B
16Wednesday, April 14, 2004
Title
Size Document Number Rev
Date: Sheet of
B3
6.MCU
onBACKLITE
ST_DET2
onPANEL_5V/3.3V
SDA
INT
CSZ
DDC_DAT
ST_DET1
SCL
HWRESET
DDC_CLK
Volume
VCC5V
VCC12V
VCPU
RXD
TXD
AD0
AD1
AD2
AD3
VAA4
VCC12V
VAA4
VCC5V
PA[0..9]
VCC12V
VAA3VAA2
VCC2.5
VCPU
VCPU
VCC3.3
VAA3
PB[0..9]

17” LCD Color Monitor Wipro WLA171t
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R202
10K 1/16W
C217
0.068uF
onBACKLITE 6
VAA3
Q201
PMBS3904
32
1
Q202
PMBS3904
32
1
R206
10K 1/16W
onPanel_5V/3.3V6
D201 SS14
R209
0 1/16W
VLCD 5
VCC5V
+
C211
47uF/16V
VCC5V 3,4,6
VCC12V
U202
AIC1084-33M
3
1
2
VIN
ADJ
VOUT
VCC2.5 4
VCC3.3
VAA4
+
C208
100uF/16V
FB201
600 OHM
VCC12V
VAA2 4
VCPU
R201 4.7K 1/16W
AdjBACKLITE4
GND R212 4.7K 1/16W
VAA1 4
POWER
D
TSU16AK
B
26Friday, November 26, 2004
Title
Size Document Number Rev
Date: Sheet of
VAA1
GND
VCPU 6
VCC12V 6
VCC5V
VLCD
C201
0.1uF
Brightness
VCC5V
R208
10K 1/16W
C214
0.1uF
GND
R204
10K 1/16W
TO-263
R216
4.7K 1/16W
VCC5V
CN201
CONN
2
4
6
8
10
12
1
3
5
7
9
11
R214 delete
VCC12V
C206
1uF/25V
VCC5V+
GND C210
0.1uF
R211
10K 1/16W
NEW
Circuit
Q203
AO3401
C212
0.1uF
R203
1K 1/16W
U201
RT9164
3 2
1
VI VO
GND
ON_OFF
VCC3.3
C
BE
+
C204
220uF/25V
VAA3 4
R215
100K 1/16W
VCC5V
VCC5V
+
C202
220uF/25V
C
BE
VCC5V
GND
R210
NC
GND
R213
NC
SOT-252
VAA4 4
VCC5V
C203
0.1uF
C205
0.1uF
DIM
VCC12V
C216
0.1uF
VCC5V+
R207
4.7K 1/16W
VCC3.3 4
Q204
PMBS3904
32
1
D202
GS1D
R205 4.7K 1/16W
+
C215
47uF/16V
C207
0.1uF
VCC2.5
VAA2
VCC5V+

17” LCD Color Monitor Wipro WLA171t
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VCC5V
R324
10K 1/16W
G+ 4
R306 100 1/16W
C308 0.047uF
R- 4
C315
0.1uF
D320
TZMC5V6-GS08
D303
BAV99
3
1 2
RIN 4
R309 100 1/16W
D310
BAV99
3
1 2
D314
LL5232B 5.6V 5%
R318
10K 1/16W
C309 0.047uF
R310 1K 1/16W
R321
10K 1/16W
CN302
JACK
1
2
3
4
5
6
7
8
25
28
9
10
11
12
13
14
15
16
26
29
17
18
19
20
21
22
23
24
27
DAT2-
DAT2+
2/4shield
DAT4-
DAT4+
DDC SCL
DDC SDA
VSYNC
R
HSYNC
DAT1-
DAT1+
1/3shield
DAT3-
DAT3+
+5V
SYNC GND
HPD
G
RGB GND
DAT0-
DAT0+
0/5shield
DAT5-
DAT5+
clk shield
clk+
clk-
B
PC5V
R320 100 1/16W
CLK+ 4
VCC5V
D305
BAV70
1
2 3
D311
BAV99
3
1 2
D312
BAV99
3
1 2
C306 0.047uF
D308
BAV99
3
1 2
R319 100 1/16W
CLK- 4
R322 100 1/16W
R315 100 1/16W
HSI
C314
0.1uF
R311 1K 1/16W
R303 100 1/16W
D309
BAV99
3
1 2
ST_DET2 6
C305 0.047uF
C310 0.047uF
D321
TZMC5V6-GS08
HSYNC 4
C311
33pF
DVI5V
D304
BAV70
1
2 3
VGA_CON
D306
BAV99
3
1 2
PC5V
R302 100 1/16W
R314
10K 1/16W
D318
TZMC5V6-GS08
R327
75 1/16W
D315
LL5232B 5.6V 5%
FB304 150 OHM
D307
BAV99
3
1 2
SOG 4
R313
2.2K 1/16W
C301
NC
RXD 6
R305 100 1/16W
B+ 4
C304 0.047uF
R317
10K 1/16W
D302
BAV99
3
1 2
VCC5V
D301
BAV99
3
1 2
D317
TZMC5V6-GS08
C303
NC
D313
BAV99
3
1 2
GNDB 4
D316
LL5232B 5.6V 5%
U301
M24C02WMN6
1
2
3
45
6
7
8A0
A1
A2
GNDSDA
SCL
WP
VCC
DAT_DDC2
FB302 0 1/16W
DVI5V
CLK_DDC
R316 100 1/16W
VSYNC 4
R301 100 1/16W
ST_DET1 6
INPUT
D
TSU16AK
B
36Tuesday, November 09, 2004
Title
Size Document Number Rev
Date: Sheet of
DAT_DDC
FB301 0 1/16W
U302
M24C02WMN6
1
2
3
45
6
7
8A0
A1
A2
GNDSDA
SCL
WP
VCC
GNDR 4
VSI
R307 100 1/16W
FB303 0 1/16W
D323
TZMC5V6-GS08
GNDG 4
DDC_DAT6
TXD 6
VCC5V
R304 470 1/16W
C302
NC
CLK_DDC2
C313
0.1uF
GIN 4
DDC_CLK6
VCC5V
R326
75 1/16W
BIN 4
R323
10K 1/16W
B- 4
R308
10K 1/16W
CN301
DB15
1
6
2
7
3
8
4
9
5
11
12
13
14
15
10
C307 0.001uF
G- 4
R325
75 1/16W
C312
220pF
D322
TZMC5V6-GS08
R312 100 1/16W
D319
TZMC5V6-GS08
R+ 4