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Service Guide
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Acer AL1751
Service Guide
Service Guide Version and Revision
No. Version Release Date Revision
1 1.0 Mar.-14- 2005 Original release
2
Copyright
Copyright 2005 LiteOn Technology Corp.
All rights reserved.
This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or
converted to any electronic machine readable form without prior written permission of LiteOn
Technology Corp.
ACER AL1751 Service Manual
Printed in Taiwan.
Disclaimer
The information in this guide is subject to change without notice. Acer Incorporated makes no
representations or warranties, either expressed or implied, with respect to the contents hereof
and specifically disclaims any warranties of merchantability or fitness for any particular
purpose. Any Acer Incorporated software described in this manual is sold or licensed "as is".
Should the programs prove defective following their purchase, the buyer (and not Acer
Incorporated, its distributor, or its dealer) assumes the entire cost of all necessary servicing,
repair, and any incidental or consequential damages resulting from any defect in the software.
Acer is a registered trademark of Acer Corporation.
Intel is a registered trademark of Intel Corporation.
Pentium and Pentium II/III are trademarks of Intel Corporation.
Other brand and product names are trademarks and/or registered trademarks of their
respective holders.
3
Trademarks
LiteOn is a registered trademark of LiteOn Technology Corp.
All other trademarks are property of their respective owners.
Conventions
The following conventions are used in this manual:
Screen messages Denotes actual messages that appear on screen.
Gives bits and pieces of additional information related to the
NOTE
current topic.
Alerts you to any damage that might result from doing or not
WARNING
doing specific actions.
Gives precautionary measures to avoid possible hardware or
CAUTION
software problems.
Remind you to do specific actions relevant to the accomplishment
IMPORTANT
of procedures.
Preface
Before using this information and the product it supports, please read the following general
information.
1. This Service Guide provides you with all technical information relating to the BASIC
CONFIGURATION decided for Acer's "global" product offering. To better fit local market requirements
and enhance product competitiveness, your regional office MAY have decided to extend the
functionality of a machine (e.g. add-on card, modem, or extra memory capability). These
LOCALIZED FEATURES will NOT be covered in this generic service guide. In such cases,
please contact your regional offices or the responsible personnel/channel to provide you
with further technical details.
2. Please note WHEN ORDERING FRU PARTS, that you should check the most up-to-date
information available on your regional web or channel. If, for whatever reason, a part
number change is made, it will not be noted in the printed Service Guide. For
ACER-AUTHORIZED SERVICE PROVIDERS, your Acer office may have a DIFFERENT
part number code to those given in the FRU list of this printed Service Guide. You MUST
use the list provided by your regional Acer office to order FRU parts for repair and service
of customer machines.
4
Warning: (For FCC Certified Models)
Note: This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy, and if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
4. Consult the dealer or an experienced radio/TV technician for help.
Notice:
1. The changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment.
2. Shielded interface cables and AC power cord, if any, must be used in order to comply with
the emission limits.
3. The manufacturer is not responsible for any radio or TV interference caused by
unauthorized modification to this equipment. It is the responsibility of the user to correct
such interference.
As an ENERGY STAR® Partner our company has determined that this product meets the
ENERGY STAR® guidelines for energy efficiency.
Warning:
To prevent fire or shock hazard, do not expose the monitor to rain or moisture. Dangerously
high voltages are present inside the monitor. Do not open the cabinet. Refer servicing to
qualified personnel only.
5
Precautions
Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub,
swimming pool or in a wet basement.
Do not place the monitor on an unstable trolley, stand, or table. If the monitor falls, it can
injure a person and cause serious damage to the appliance. Use only a trolley or stand
recommended by the manufacturer or sold with the monitor. If you mount the monitor on a
wall or shelf, use a mounting kit approved by the manufacturer and follow the kit
instructions.
Slots and openings in the back and bottom of the cabinet are provided for ventilation. To
ensure reliable operation of the monitor and to protect it from overheating, be sure these
openings are not blocked or covered. Do not place the monitor on a bed, sofa, rug, or
similar surface. Do not place the monitor near or over a radiator or heat register. Do not
place the monitor in a bookcase or cabinet unless proper ventilation is provided.
The monitor should be operated only from the type of power source indicated on the label.
If you are not sure of the type of power supplied to your home, consult your dealer or local
power company.
The monitor is equipped with a three-pronged grounded plug, a plug with a third
(grounding) pin. This plug will fit only into a grounded power outlet as a safety feature. If
your outlet does not accommodate the three-wire plug, have an electrician install the
correct outlet, or use an adapter to ground the appliance safely. Do not defeat the safety
purpose of the grounded plug.
Unplug the unit during a lightning storm or when it will not be used for long periods of time.
This will protect the monitor from damage due to power surges.
Do not overload power strips and extension cords. Overloading can result in fire or electric
shock.
Never push any object into the slot on the monitor cabinet. It could short circuit parts
causing a fire or electric shock. Never spill liquids on the monitor.
Do not attempt to service the monitor yourself; opening or removing covers can expose
you to dangerous voltages and other hazards. Please refer all servicing to qualified service
personnel
To ensure satisfactory operation, use the monitor only with UL listed computers which have
appropriate configured receptacles marked between 100 - 240V AC, Min. 3.5A.
The wall socket shall be installed near the equipment and shall be easily accessible.
For use only with the attached power adapter (output 12V DC) which have UL, CSA listed
license
6
Special Notes On LCD Monitors
The following symptoms are normal with LCD monitor and do not indicate a problem.
Notes
Due to the nature of the fluorescent light, the screen may flicker during initial use. Turn off
the Power Switch and then turn it on again to make sure the flicker disappears.
You may find slightly uneven brightness on the screen depending on the desktop pattern
you use.
The LCD screen has effective pixels of 99.99% or more. It may include blemishes of 0.01%
or less such as a missing pixel or a pixel lit all of the time.
Due to the nature of the LCD screen, an afterimage of the previous screen may remain
after switching the image, when the same image is displayed for hours. In this case, the
screen is recovered slowly by changing the image or turning off the Power Switch for
hours.
7
Table Of Contents
Chapter 1 Monitor Features ............................................. 9
Introduction ............................................. 10
Electrical Requirements ............................................. 12
LCD Monitor General Specification ............................................. 11
LCD Panel Specification ............................................. 12
Block Diagram ............................................. 14
Main Board Diagram ............................................. 15
Software Flow chart ............................................. 16
Main Board Layout ............................................. 17
Front Bezel ............................................. 19
Rear Bezel ............................................. 21
Adjusting the picture ............................................. 22
LOGO ............................................. 26
Chapter 2 Machine Disassembly ............................................. 27
Chapter 3 Troubleshooting ............................................. 32
Chapter 4 Connector Information ............................................. 38
Chapter 5 FRU (Field Replacement Unit) List ............................................. 39
Exploded Diagram ............................................. 40
Chapter 6 Schematic Diagram ............................................. 44
Top ............................................. 44
Power ............................................. 45
Input ............................................. 46
Scaler ............................................. 47
Panel interface ............................................. 48
Mpu ............................................. 49
............................................. 50
Adapter Board 51
Inverter Board 52
8
Chapter 1
Monitor Features
Introduction
Scope
This specification defines the requirements for the 17" MICRO-PROCESSOR based
Multi-mode supported high resolution color LCD monitor. This monitor can be directly
connected to general 15 pin D-sub VGA connector and 24 pin DVI connector. It also supports
VESA DPMS power management and plug & play function. There is a build-in stereo audio
amplifier with OSD control to drive a pair of speakers.
Description
The LCD monitor is designed with the latest LCD technology to provide a performance
oriented product with no radiation. This will alleviate the growing health concerns. It is also a
space saving design, allowing more desktop space, and comparing to the traditional CRT
monitor, it consumes less power and gets less weight in addition MTBF target is 50k hours or
more.
Chart of AL1751
17" SEC
Panel
LTM170EU-L21
D-SUB
Signal Interface
DVI
Sync Type Separate / Compatible
Color Temp User Adjust Support
DDC DDC2B
Speaker 1.5W + 1.5W (Rated power)
3.5mm stereo phone jack,
Headphone Jack
green color
Microphone Jack No
USB Hub Not support
Tilt / Swivel Yes / No
9
Electrical Requirements
Standard Test Conditions
All tests shall be performed under the following conditions, unless otherwise specified.
Ambient light : Dark room
Viewing distance : 40 cm for LCD performance, 20 cm for LCD failures
Warm up time
All specifications : 30 minutes
Fully functional : 5 seconds
Measuring equipment : Chroma 7120 signal generator or equivalent, directly
Connected to the monitor under test.
Control settings Minolta CA100 photometer, or equivalent
User brightness control : Set to Factory preset value (cut off raster)
User contrast control : T Set to factory preset value, which allows that the
brightest two of 32 linear distributed gray-scales (0
700mv) can be distinguished.
User red/white balance,
Green/white balance and
Blue/white balance control : In the center (unless otherwise specified)
Power input : 230V 5
Ambient temperature : 20+5
Analog input mode : 1280x1024, 60 Hz, all white
Measurement systems
The units of measure stated in this document are listed below:
1 gamma = 1 nano tesla
1 tesla = 10,000 gauss
cm = in x 2.54
lb = kg x 2.2
degrees F = [°C x 1.8] + 32
degrees C = [°F - 32]/1.8
u' = 4x/(-2x + 12y + 3)
v' = 9y/(-2x + 12y + 3)
x = (27u'/4)/[(9u'/2) - 12v' + 9]
y = (3v')/[(9u'/2) - 12v' + 9]
nits = cd/(m2) = Ft-L x 3.426
lux = foot-candle x 10.76
10
LCD Monitor General Specification
Panel type : 17 " active matrix color TFT LCD
SAMSUNG LTM170EU-L21
Display size : 337.92mm (H) 270.336mm(V)
Display mode : Normally white
Pixel pitch : 0.264mm(H) 0.264mm(V)
Display dot : 1280 x (RGB) 1024
Pixel clock : 135 MHz
Contrast ratio 700:1
Brightness : 300 cd/m2
Response time (Tr/Tf) : 8ms (Tr=2ms, Tf=6ms)
Display color : 16.2M(RGB 8 bit Data)
Viewing angle : H:150 / V:135 ( typ)
Pc interface : RGB Analog Interface
Digital interface
Signal connector : D-Sub 15pin
DVI-D 24pin
Interface frequency : Horizontal Frequency 30KHz ----83KHz
Vertical Frequency 55Hz ------75Hz
Plug & play : VESA DDC2B, VESA DPMS
Power Input voltage : 50 ± 3Hz, 60 ± 3Hz, 100 VAC to 240VAC
Total output power : 45Watt max.
11
LCD Panel Specification
LCD Panel Model (SAMSUNG LTM170EU-L21)
Display Type active matrix color TFT LCD
Resolution 1280x1024 pixels
Display Dot 1280x (RGB) x 1024
Display Area 337.92mm(H) x 270.336mm(V)
Pixel Pitch 0.264mm(H) x 0.264mm(V)
Display Color 16.2M (true)
Lamp Frequency 80kHz (Max)
Lamp Current 7.0 mArms (Max)
Weight 1950g (Max)
Optical Specifications
IL = 6.5mArms Ta = 25 2C VDD = 5V FV = 60Hz FDCLK = 54MHz
ITEM Symbol Condition MIN. TYP. MAX. UNIT
Contrast Ratio
C/R 500 700 -
(Center of screen)
Response Rising Tr 2.0 4 -
msec
Time Falling TF 6.0 10 -
Luminance of white
YL =0, 250 300 - cd/m2
(Center of screen)
=0
RX 0.620 0.650 0.680
Red Normal
RY 0.300 0.330 0.360
Viewing
GX 0.270 0.300 0.330
Color Green Angle
GY 0.570 0.600 0.630
Chromaticity
BX 0.120 0.150 0.180
(CIE 1931) Blue
BY 0.050 0.080 0.110
WX 0.283 0.313 0.343
White
WY 0.299 0.329 0.359
L 65 75 -
Hori.
Viewing R 65 75 -
CR 10 Degrees
Angle H 65 75 -
Ver.
L 50 60 -
Brightness Uniformity
BUNI - - 25 %
(9 Points)
12
Supported Timing
VESA MODES
Horizontal Vertical
Nominal Sync Nomina Sync Nominal
Frequenc Polarit l Polarity Pixel
Mode Resolution Total y y Freq. Clock
+/- +/- 1 Hz (MHz)
0.5kHz
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
VGA 640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500
640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500
800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000
SVGA
800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000
800x600@75Hz 1056x625 46.875 P 75.000 P 49.500
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
XGA 1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
1152x864@75Hz 1600X900 67.5khz P 75 P 108.000
1280x1024@60H 1688x1066 63.981 P 60.020 P 108.000
z
SXGA
1280x1024@75H 1688x1066 79.976 P 75.025 P 135.000
z
IBM MODES
Horizontal Vertical
DOS 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322
DOS 640x350@70Hz 800 x 449 31.469 P 70.087 N 25.175
XGA 1024x768@72Hz 1304 x 798 57.515 P 72.1 P 75.000
MAC MODES
VGA 640x480@67Hz 864x525 35.000 N 66.667 N 30.240
SVGA
832x624@75Hz 1152x667 49.725 N 74.551 N 57.2832
1024x768@60H
1312x813 48.780 N 60.001 N 64.000
XGA z
1024x768@75H
1328x804 60.241 N 74.927 N 80.000
z
13
Monitor Block Diagram
The LCD MONITOR will contain a main board (include: keypad board and audio board), an
inverter board, adapter which house the flat panel control logic, brightness control logic and
DDC.
The Inverter board will drive the backlight of panel.
The adapter will provide the 12V DC-power to inverter/power board and main board.
CCFL Drive. Flat Panel and
CCFL backlight
Inverter board Main Board
RS232 Connector For
(Include: Audio board, keyboard)
white balance adjustment
in factory mode
Adapter
AC-IN
HOST Computer Video signal, DDC
100V-240V
14
Main Board Diagram
EEPROM LCD Interface
24C16
Scaler TSU56AK PQFP-128
Crystal
MCU (Include: ADC, OSD etc)
14.318MHZ
OSD Control DVI D-SUB
Interface (Keypad) Connector Connector
EEPROM EEPROM
24C02 24C02
15
Software Flow Chart
1) MCU initialize.
2) Is the eeprom blank?
1 3) Program the eeprom by default values.
4) Get the PWM value of brightness from
eeprom. Check the pin PANEL1 and PANEL2
to tell which panel to get with it.
5) Is the power key pressed?
2 Y 3 6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
N 8) Enter factory mode.
9) Saving the power key status into eeprom.
4 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 and digital port, are there
5 N any signals coming?
13) Does the scalar send out a interrupt request?
Y 14) Wake up the scalar.
15) Are there any signals coming from analog or
digital port?
6 16) Display " No Input Signal " 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.
7 N 8 19) Read the keyboard. Is the power key pressed?
Y
9
10 N 11
Y
N 12 13 N
Y Y
14 15 N 16
Y
17
18 N 19
Y
16
Main Board Layout
17
Location Part NO Description
U301 56L1133 34 M24C02-WMN6T SMT
U302 56L1133 34 M24C02-WMN6T SMT
U401 56L 562 82 TSU56AK PQFP-128
U402 56L1125137SZB W78E65-40P
U403 56L1133 24 AT24C16AN-10SI-2.7
U701 56L 563 11 SI-8050SD
U702 56L 563 31 AZ1117D-1.8
CN301 88L 35315F H D-SUB 15PIN
CN302 88L 35424F H DVID CONN. 24P FEMALE
CN402 33L801724A H PIN HEADER 24P 2.0mm
CN601 33G3802 4H WAFER 4P RIGHT ANGLE
CN602 88L 30214K PHONE JACK
CN603 88L 30211K PHONE JACK
CN701 88L 304 1C power jack
CN702 33G3802 6H WAFER 6P RIGHT ANGLE PI
U601 56L 616 1 TDA7496L BY ST
X401 93L 22 53 CRYSTAL 14.318MHzHC-49U
X402 93L 22 55 H 20MHZ
18
Front Bezel
19
20
Rear Bezel
21
Adjusting the Picture
22
23
b. The Description For Control Function
24
25
Logo
When the monitor is power on, the LOGO will be showed in the center, and disappear slowly.
How To Optimize The DOS-Mode
Plug And Play
Plug & Play DDC1/2B Feature
This monitor is equipped with VESA DDC1/2B capabilities according to the VESA DDC
STANDARD. It allows the monitor to inform the host system of its identity and, depending on
the level of DDC used, communicate additional information about its display capabilities. The
communication channel is defined in two levels, DDC1 and DDC2B.
The DDC1 is a unidirectional data channel from the display to the host that continuously
transmits EDID information. The DDC2B is a bidirectional data channel based on the I˛C
protocol. The host can request EDID information over the DDC2B channel.
This monitor will appear to be non-functional if there is no video input signal. In order
for this monitor to operate properly, there must be a video input signal.
This monitor meets the Green monitor standards as set by the Video Electronics Standards
Association (VESA) and/or the United States Environmental Protection Agency (EPA) and
The Swedish Confederation Employees (NUTEK). This feature is designed to conserve
electrical energy by reducing power consumption when there is no video-input signal present.
When there is no video input signal this monitor, following a time-out period, will automatically
switch to an OFF mode. This reduces the monitor's internal power supply consumption. After
the video input signal is restored, full power is restored and the display is automatically
redrawn. The appearance is similar to a "Screen Saver" feature except the display is
completely off. The display is restored by pressing a key on the keyboard or clicking the
mouse.
Using The Right Power Cord
The accessory power cord for the Northern American region is the wallet plug with NEMA
5-15 style and is UL listed and CSA labeled. The voltage rating for the power cord shall be
125 volts AC.
Supplied with units intended for connection to power outlet of personal computer: Please use
a cord set consisting of a minimum No. 18 AWG, type SJT or SVT three conductors flexible
cord. One end terminates with a grounding type attachment plug, rated 10A, 250V, CEE-22
male configuration. The other end terminates with a molded-on type connector body, rated
10A, 250V, having standard CEE-22 female configuration.
Please note that power supply cord needs to use VDE 0602, 0625, 0821 approval power cord
in European counties.
26
Chapter 2
Machine Disassembly
This chapter contains step-by-step procedures on how to assemble the monitor for
maintenance.
Disassembly Procedure
1. Remove two screws to release back cover. (Fig 1).
2. Remove the base stand (Fig 2)
Fig 1
Fig2
3. Remove four screws to release front bezel. (Fig 3)
4. Remove the hinge cap. (Fig 4)
27
Fig 3
Fig 4
5. Remove eleven screws to release top cover and bottom cover. (Fig 5)
6. Remove the main board. (Fig 6)
28
Fig 5
Fig 6
7.Remove six clamps to release shield and the main board. (Fig 7)
8.Remove the main frame. (Fig 8)
9.Remove the inverter board. (Fig 9)
29
Fig 7
Fig 8
30
Fig 9
31
Chapter 3
Troubleshooting
This chapter provides troubleshooting information for the AL1751:
1. No power
No power
Press power key and look
if the picture is normal
NG
Measure 12V input voltage
NG
OK Check the adapter
section
Measure U702 PIN2=5V?
NG
OK Replace U702
NG
X402 oscillate waveform
is normal
NG Replace X402
OK
Replace U402
NG
Replace U401
32
2. No picture (LED is orange)
No picture
NG X402 oscillate waveform
Key is under control? is normal
OK
NG Replace X402
X401 oscillate waveform OK
is normal
Replace U402
NG Replace X401
OK NG
Check if the sync signal from Replace U401
computer is output and video
cable is connected normally
NG Input the sync signal of computer,
or change the cable
OK
Replace U401
33
3. Panel Power Circuit
Measure Q703 base
is high level?
NG X402 oscillate waveform
OK
is normal
Check Q703 and Q704 are NG Replace X402
broken or CN503 solder? OK
Replace U402
NG
Check Correspondent NG
component.
OK
Replace U401
Replace PANEL
34
4. Keypad Board
OSD is unstable or not working
NG
Is Keypad board connecting normally Connect Keypad Board
OK
NG
Is Button Switch normally Replace Button Switch
OK
NG
Is Keypad board normally Replace Keypad Board
35
5. Inverter Board
No Backlight
Check CN801 Pin1 =12V
OK NG
Check adapter
Check ON/OFF signal
NG
OK
Check Interface board
Check U801 PIN3 voltage is normal?
OK NG
Check Q804,Q803,Q802 circuit
Check U801 PIN18 triangular
wave is normal
NG
OK
Check C816, C821
Check U801 PIN11, 12, 19, 20
NG
OK
Check U801,Q801, Q805, Q806, Q807
Check D801-D804, D811,
D805, D810, D808
36
6.No Audio
Mute and volume setting is ok?
NG
Reset mute and
OK volume
Check power supply of U601 is 12V?
NG
Check connecting is ok?
OK
NG
Check input signal of U601is ok? Reconnect
NG
Check correspondent
OK component
Replace U601
NG
Replace speaker
37
Chapter 4
Connector Information
The following figure shows the connector locations on the monitor board:
1 5
6 10
11 15
15 Pin Color Display Signal Cable (D-sub)
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1. Red 9. +5V
2. Green 10. Logic Ground
3. Blue 11. Monitor Ground
4. Monitor Ground 12. DDC-Serial Data
5. DDC-Return 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
24 Pin Color Display Signal Cable (DVI)
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1. TMDS Data2- 13. TMDS Data3+
2. TMDS Data2+ 14. +5V Power
3. TMDS Data 2/4 Shield 15. Ground
4. TMDS Data4- 16. Hot Plug Detect
5. TMDS Data4+ 17. TMDS Data0-
6. DDC Clock 18. TMDS Data0+
7. DDC Data 19. TMDS Data 0/5 Shield
8. Analogue Vertical Sync 20. TMDS Data5-
9. TMDS Data1- 21. TMDS Data5+
10. TMDS Data1+ 22. DDC Clock Shield
11. TMDS Data 1/3 Shield 23. TMDS Clock+
12. TMDS Data3- 24. DDC TMDS Clock-
38
Chapter 5
FRU (Field Replaceable Unit) List
This chapter gives you the FRU (Field Replaceable Unit) listing in global configurations of
AL1922.Refer to this chapter whenever ordering for parts to repair or for RMA (Return
Merchandise Authorization).
NOTE: Please note WHEN ORDERING FRU PARTS, that you should check the most
up-to-date information available on your regional web or channel
(http://aicsl.acer.com.tw/spl/). For whatever reasons a part number change is made, it
will not be noted in the printed Service Guide. For ACER AUTHORIZED SERVICE
PROVIDERS, your Acer office may have a DIFFERENT part number code from those
given in the FRU list of this printed Service Guide. You MUST use the local FRU list
provided by your regional Acer office to order FRU parts for repair and service of
customer machines.
NOTE: To scrap or to return the defective parts, you should follow the local government
ordinance or regulations on how to dispose it properly, or follow the rules set by your
regional Acer office on how to return it.
39
Exploded Diagram (Model: AL1751)
40
Part List
Item Picture Description Part No.
1 33G4843 QT L
Hinge cover
33G4841 QT L
2 Bezel 34G1538AQW B
3 Back cover 34G1540 QT B
4 SHIELDING 85L6117 1
41
5 MAIN FRAME 15L6190 1
6 Panel 750LLS70U21
7 Power board INPC1742SEA2
8 Main board CBPC780KS2AY
78G 322 3 L&
9 Speakers
78G 322 3 R
42
Chapter 6
Schematic Diagram
TSU56AK SCHEMATIC B2
B1
RIN RIN
GNDR GNDR
TXD GIN GIN
RXD GNDG GNDG
DDC_CLK SOG SOG
DDC_DAT BIN BIN
DDC_WP GNDB GNDB VCC1.8 VCC3.3 VAA1 VAA2 VAA3 VAA4
ST_DET1 HSYNC HSYNC
ST_DET2 VSYNC VSYNC
VCC1.8
R+ R+ VCC3.3
R- R-
G+ G+ VAA1
G- G-
B+ B+ VAA2
B- B-
CLK+ CLK+ VAA3
CLK- CLK-
VAA4
3.INPUT
B3
ST_DET2
ST_DET1
DDC_WP CSZ CSZ
DDC_CLK SCL SCL
DDC_DAT SDA SDA
RXD HWRESET HWRESET
TXD INT INT
AD0 AD0
AD1 AD1
VCPU AD2 AD2
AD3 AD3
VCPU
onPANEL_5V/3.3V
onBACKLITE
B5
AUDIO_SD PA[0..9]
AUDIO_MU PA[0..9] PA[0..9]
6.MCU
B6
VCC12V_AUDIO VLCD
VCPU PB[0..9]
VCC12V_AUDIO PB[0..9] PB[0..9]
VCC3.3 VCC12V_AUDIO
VCC1.8 AUDIO_MU
VAA1 AUDIO_SD
VAA2 VLCD
VAA3 VOLUME Volume
VAA4 7.AUDIO
B4
onBACKLITE 5.PANEL INTERFACE
onPanel_5V/3.3V
VCPU
VCC12V_AUDIO
VCC3.3
VCC1.8 AdjBACKLITE AdjBACKLITE
VAA1
VAA2
VAA3 VLCD
VAA4 Title
4.SCALER
VLCD TSU56AK FOR ACER
Size Document Number Rev
B TOP D
2.POWER Date: Wednesday, January 19, 2005 Sheet 2 of 8
44
CN701 VCC12V VCC5V
LP701 U701
POWER JACK SI-8050SD D702 SS14
1+12V_IN 6 3 1 4 VCC5V+
VIN FBK VCC5V+
5 2 2
GND
Vout
/ON
L701
2
4 1
L701A
FB704 600 OHM
VCPU
D703 SOT-252
+ + + +
C702 C703 C706 C707 C704 C705 C708 VCPU 7
C701 GS1D VCC1.8
5
3
INDUTOR-P U702
0.001uF 220uF/16V 220uF/16V 0.1uF/16V 0.1uF/16V 220uF/16V 220uF/16V 0.1uF/16V AZ1117D-1.8
D701 3 2
VI VO VCC1.8 5
SMB340
R702
GND
C710 C711 C709 + C712
0.1uF/16V NC
0.1uF 47uF/16V 0.1uF
1
VCC12V VCC3.3
VCC12V VCC12V_AUDIO
FB702 120 OHM
VCC3.3 5
VCC5V+
VCC12V_AUDIO 8
FB701 600 OHM C713 + C714
0.1uF/16V VCC5V
TO-263
220uF/16V U703 VAA1
AIC1084-33M
3 2
VIN VOUT VAA1 5
4
CN702 R703 FB703 120 OHM 1 VOUT
C717 ADJ C716 + C718 VAA2
6 10K 1/16W
5 0.1uF 47uF/16V 0.1uF
ON_OFF R701 VAA2 5
4 4.7K 1/16W
3 VAA3
2
3
1 C715 R704 4.7K 1/16W
VAA3 5
1
onBACKLITE 7
0.1uF Q701 VAA4
PMBS3904
CONN VCC5V
2
VAA4 5
C
B E
R705
1K 1/16W
R706
Q702 FTD7 FTD8 FTD9 FTD10
3
1K 1/16W R707 FD Mark FD Mark FD Mark FD Mark
+ C719 1
AdjBACKLITE 5
22uF/16V PMBS3904 1K 1/16W
2
C
B E