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Acer AL2251W
Service Guide
1
Service Guide Version and Revision
Version Release Date Revision History TPV model
A00 Sep-29-2006 Initial Release TC6MMADKWGAGACP
2
Copyright
Copyright Š 2006 by Acer Incorporated. All rights reserved. No part of this publication may be reproduced,
Transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in
any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without
the prior written permission of Acer Incorporated.
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.
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.
Trademarks
Acer is a registered trademark of Acer Incorporated.
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.
Note Gives bits and pieces of additional information related to the current topic.
Warning Alerts you to any damage that might result from doing or not doing specific
actions.
Caution Gives precautionary measures to avoid possible hardware or software
problems.
Important Remind you to do specific actions relevant to the accomplishment of
procedures.
3
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.
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 ENERGY STARŽ Partner our company has determined that this product meets the ENERGY STARŽ
guidelines for energy efficiency.
Warning:
To prevent fire or shock hazard, do not expose the monitor to rain or moisture. Dangerous high voltages are
present inside the monitor. Do not open the cabinet. Refer servicing to qualified personnel only.
4
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, uses 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. 5A.
The wall socket shall be installed near the equipment and shall be easily accessible.
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.
5
Table Of Contents
Chapter 1 Monitor Features ................................................ 6
Introduction ............................................. 7
Electrical Requirements ............................................. 8
LCD Monitor General Specification ............................................. 9
LCD Panel Specification ............................................. 11
Support Timing ............................................. 13
Monitor Block Diagram ............................................. 14
Main Board Diagram ............................................. 15
Software Flow chart ............................................. 16
Main Board Layout ............................................. 18
Front Bezel ............................................. 19
Rear Bezel ............................................. 20
Chapter 2 Operating Instructions ............................................. 21
External Controls ............................................. 21
Front Panel Controls ............................................. 22
Adjusting the picture ............................................. 23
Hot-Key Menu ............................................. 26
OSD Message ............................................. 26
LOGO ............................................. 27
Chapter 3 Machine Disassembly ............................................. 28
Chapter 4 Troubleshooting ............................................. 33
Chapter 5 Connector Information ............................................. 38
Chapter 6 FRU (Field Replacement Unit) List ............................................. 39
Exploded Diagram ............................................. 40
Chapter 7 Schematic Diagram ............................................. 43
6
Monitor Features Chapter 1
Introduction
Scope
This specification defines the requirements for the 19" MICROPROCESSOR 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, 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 AL2251W
Panel M220Z1-L01
D-Sub 15-pin
Signal Interface
DVI 24-pin
Sync Type Separate / Compatible
Color Temp User Adjust Support
DDC DDC2B
Speaker 1.5W + 1.5W (Rated power)
Headphone Jack 3.5mm stereo phone jack
Microphone Jack No
USB Hub Not support
Tilt / Swivel Yes / No
7
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.
Minolta CA100 photometer, or equivalent
Control settings
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
Display mode : 1680x1050, 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
8
LCD Monitor General Specification
9
10
LCD Panel Specification
LCD Panel Model (M220Z1-L01)
General Specifications
Mechanical Specification
11
Optical Specifications
Test Conditions
12
Supported Timing
VESA MODES
Horizontal Vertical
Nominal Sync Nominal Sync Nominal
Mode Resolution Total Frequency Polarit Freq. Polari Pixel Clock
+/- 0.5kHz y +/- 1 Hz ty (MHz)
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
1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
XGA
1024x768@72Hz 1304x798 57.7 P 72 P 78.4
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
1280x1024@70Hz 1688x1066 74.4 P 70 P 124.9
SXGA 1280x1024@72Hz 1688x1066 77.9 P 72 P 134.6
1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
1280x960@60Hz 1800x1000 60 P 60 P 108
1440x900@60Hz 1904x934 55.93 P 60 P 106.5
WSXGA 1680x1050@60Hz 2240x1089 65.29 N 59.95 P 146.25
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
XGA 1024x768@60Hz 1312x813 48.780 N 60.001 N 64.000
1024x768@75Hz 1328x804 60.241 N 74.927 N 80.000
13
Monitor Block Diagram
The LCD MONITOR will contain a main board, a power board, and keypad board which house the flat panel control
logic, brightness control logic and DDC.
The Inverter board will drive the backlight of panel and the DC-DC conversion,
The Adapter will provides the 12V DC-power to inverter/power board.
Monitor Block Diagram
POWER(90V-264)
Adapter (12V) IDPC LAMP
Audio IC DC-DC
Analog in
LCD Controller
-Scaler LCD PANEL
Digital in Flash room -OSD
PMC010 -ADC
SPEAKER KEY BOARD SPEAKER
14
Main Board Diagram
MAIN BOARD DIAGRAM
VAA4
VCC3.3V VAA2
AT24C02 VCC1.8V VAA1 VAA3
(DDC)U301 DDCA SCL/SDA
DDC
CLK1/DAT1
VGA R/G/B
VGA Input
PA 0~9
RXD/TXD VGA Hsync/Vsync
PB 0~9
U402
U401
PM25L010-25 HS/V Panel
TSUMU58WHJ
DVI Clk+/Clk-
Signal
R/G/B
DDCD
AT24C02 SDA/SCL
(DDC)U302
AT24C16 CAT24WC08
U403 KEY Control U407
15
Software Flow Chart
1
Y
2 3
N
4
N
5
Y
6
N
7 8
Y
9
N
10 11
Y
N N
12 13
Y Y
N
14 15 16
Y
17
N
18 19
Y
16
Remark:
1) MCU initializes.
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 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
Main Board Layout
Symbol Description Symbol Description
U401 IC TSUMU58WHJ-LF PQFP-128 U702 LM3485 MSOP-8 NS
X401 CRYSTAL 14.318MHzHC-49US CN302 DV1 CONNECTOR 24 PIN
U601 IC TDA7496T 1.2W*2 DIP-20 ST CN601 WAFER 4P RIGHT ANGLE
U403 M24C16-WMN6TP CN702 WAFER 6P RIGHT ANGLE PITCH 2.0
U402 IC PM25LV010-25 SCE SOIC-8 PMC CN402 WAFER 30P 2.0MM RIGHT ANGLE
U407 CAT24WC08W SOIC-8 CN602 PHONE JACK 5PIN
U601 IC TDA7496T 1.2W*2 DIP-20 ST CN603 PHONE JACK 5PIN
U301 M24C02-WMN6TP CN701 DC JACK 3PIN
18
Chapter 2
Adjusting the viewing angle
ˇ For For optimal viewing it is recommended to look at the full face of the monitor, then adjust the monitor's angle to
your own preference.
ˇ Hold the stand so you do not topple the monitor when you change the monitor's angle.
ˇ You can adjust the angle of the monitor from -5° to 15°, but please notice that the rear obliquity of the monitor must
not be over 15° when you adjust it, otherwise the machine may be inclined.
NOTES
ˇ Do not touch the LCD screen when you change the angle. It may cause damage or break the LCD screen.
ˇ Careful attention is required not to catch your fingers or hands when you change the angle.
19
Rear Bezel
Item Description Item Description
1. D-SUB Cable 4. External Adapter
2. DC-Jack Power Cable 5. DVI Cable
3. AC Power Cord 6. Audio Cable
20
Operating Instructions Chapter 2
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.
ˇ The power cord should be connected.
ˇ Connect the video cable from the monitor to the video card.
ˇ Press the power button to turn on the monitor position. The power indicator will light up.
External Controls
Item Description Item Description
1. >/ Volume 4. MENU/ENTER
2. 3. Power Key/Power Indicator
21
Front Panel Control
ˇ Power Button:
Press this button to turn the monitor ON or OFF. And display the monitor's state.
ˇ 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 Volume Adjust OSD status.
ˇ Activates the volume control when the OSD is OFF or navigates through adjustment icons when OSD is ON or
adjust a function when function is activated.
ˇ >/Volume:
Activates the volume control when the OSD is OFF or navigates through adjustment icons when OSD is ON or
adjusts a function when function is activated.
ˇ 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.
ˇ Power Indicator:
Blue -- Power On mode.
Orange -- Off mode
NOTES
Notes
ˇ 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.
ˇ Save the original shipping carton and packing materials, as they will come in handy if you ever have to ship your
monitor.
ˇ For maximum protection, repackage your monitor as it was originally packed at the factory.
ˇ 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.
22
Adjusting the Picture
How to Adjust a Setting
1. Press the MENU-button to activate the OSD window.
2. Press to select the desired function.
3. Press the MENU-button to select the function that you want to adjust.
4. Press < or >to change the settings of the current function.
5. To exit and save, select the exit function. If you want to adjust any other function, repeat steps 2-4.
Only Analog Input model
Dual-input model Analog Input
Dual-input model Digital Input
23
b. The Description For Control Function
24
25
Hot-Key Menu
a. Outline
b. The Description For Hot-Key Function
Item Operation Icon Description
When the OSD is closed, press Left or
Volume of Audio adjustment. The Audio will be
Volume Right button will be Volume Hot-Key
Mute when volume=0
Function
OSD Message
a. Outline
b. The Description For OSD Message
Item Description
Auto Config When Analog signal input, if User Press Hot-Key "Auto", will show this message, and the
Please Wait monitor do the auto config function.
Input Not When the Hsync Frequency, Vsync Frequency or Resolution is out of the monitor
Supported support range, will show this message. This message will be flying.
Cable Not Analog-Only Model: When the video cable is not connected, will show this message.
Connected This message will be flying.
Analog-Only Model: When the video cable is connected, but there is no active signal
No Signal
input, will show this message, then enter power saving.
26
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 DDC2B Feature
This monitor is equipped with VESA DDC2B 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 DDC2B is a bi-directional 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 signals 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. Pressing a key on the keyboard, or clicking the mouse
restores the display.
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, and 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.
27
Machine Disassembly Chapter 3
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 connector wire with base and panel, base and inverter. (Fig 2)
Fig 1
Fig 2
28
3. Remove the base stand. (Fig 3)
4.Remove the screws to release front bezel. (Fig 4)
Fig 3
Fig 4
29
5. Remove the hinge cap. (Fig 5)
6. Remove eleven screws to release top cover and bottom cover. (Fig 6)
Fig 5
Fig 6
30
7. Remove the main board. (Fig 7)
8. Remove six clamps to release shield and the main board. (Fig 8)
Fig 7
Fig 8
31
9. Removefour screws connect with panel to remove the main frame. (Fig 9-10)
10.Remove the screws to remove the inverter board. (Fig 11)
Fig 9
Fig 10
Fig 11
32
Troubleshooting Chapter 4
This chapter provides troubleshooting information for the AL2251W:
1. No Power
No power
Press power key and look
if the picture is normal
NG
Please reinsert and make sure
the AC of 100-240 is normal
NG Reinsert or check the
OK Adapter/Inverter
Measure U201 PIN2=2.5V
U202 PIN2=3.3V
NG Check CN201 or replace
OK
U201, U202
X601 and X401 oscillate
waveforms are normal
NG
OK
Replace X601, X401
Replace U601
NG
Replace U401
33
2. No Picture
No picture
The button if NG
X601 oscillate NG
Replace X601
under control waveform is normal
OK
OK
Check reset circuit of NG
Check Correspondent
U601 is normal component
Measure U201 PIN2=2.5V
U202 PIN2=3.3V OK
NG Replace U601
Replace
U201, U202
OK
X401 oscillate
waveform is normal
OK NG
Replace X401
Check HS/VS from
CN301 is normal
Replace U401
NG
Check Correspondent
OK component
Replace U401
34
3. White Screen
White screen
NG
Measure Q204 base X601 oscillate
is low level? waveform is normal
OK NG
OK Replace X601
Check Q204 is broken or
Check reset circuit of U601
CN503 solder?
is normal
NG
NG
Check Correspondent
component. Check Correspondent
OK
OK component.
Replace PANEL
Replace U601
4. Keypad Board
35
5. Inverter Board
No Backlight
36
6. No Audio
37
Connector Information Chapter 5
The following figure shows the connector locations on the monitor:
1 5
6 10
11 15
15 Pin Color Display Signal Cable (D-sub)
Pin No. Description Pin 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 Pin No. Description
1. TMDS Data2- 13. TMDS Data3+
2. TMDS Data2+ 14. +5V Power
3. TMDS Data 2/4 Shield 15. GND
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. DDC Clock+
12. TMDS Data3- 24. DDC Clock-
38
FRU (Field Replaceable Unit) List Chapter 6
This chapter gives you the FRU (Field Replaceable Unit) listing in global configurations of AL2251W.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: AL2251W)
40
Part List
Above picture show the description of the following component.
Item Picture Description
1
Hinge Cover
2 Bezel
3 Back Cover
4 Shield
5 Main Frame
41
6 Panel
7 Power Board
8 Main Board
9 Speakers
42
Schematic Diagram Chapter 7
Main Board
Top
TSUMU58J-SCHEMATIC 4.SCALER
B1
RIN RIN
GNDR GNDR
TXD GIN GIN
RXD GNDG GNDG
DDCA_SCL SOG SOG
DDCA_SDA BIN BIN
DDC_WP GNDB GNDB VCC1.8 VCC3.3
ST_DET1 HSYNC HSYNC
ST_DET2 VSYNC VSYNC
DDCD_SCL
DDCD_SDA
VCC1.8
R+ R+ VCC3.3
R- R-
G+ G+
G- G-
B+ B+
HPD_CTRL B- B-
CLK+ CLK+
CLK- CLK-
3.INPUT
ST_DET2
ST_DET1
DDC_WP
DDCA_SCL
DDCA_SDA
DDCD_SCL
DDCD_SDA
TXD
RXD
HPD_CTRL
onPanel_5V/3.3V
on_BACKLIGHT
B5
PA[0..9]
6.AUDIO PA[0..9] PA[0..9]
AUDIO_SD AUDIO_SD
VCC12V_AUDIO AUDIO_MU AUDIO_MU VLCD
PB[0..9]
VCC12V_AUDIO PB[0..9] PB[0..9]
VCC3.3 Volume Volume
VCC1.8 VCC12V_AUDIO
VLCD
6.AUDIO
B4
onBACKLITE VCTRL VCTRL 5.PANEL INTERFACE
onPanel_5V/3.3V
VCC12V_AUDIO
VCC3.3
VCC1.8 AdjBACKLITE VLCD adj_BACKLIGHT
VLCD
Title
2.POWER TSUMU58J FOR ACER
Size Document Number Rev
4.SCALER B TOP D
Date: Thursday, July 20, 2006 Sheet 2 of 7
43
Power
VCC5V
L701
U701 2.2UH
1 8
2 S D 7
3 S D 6 D701 D702 R702
C703 4 S D 5 SBM84PT SBM84PT 22 1/8W + + + + C712
G D C708 C709 C710 C711 1000pF
0805
AM4811P-T1-PF 220uF/16V 220uF/16V 220uF/16V 220uF/16V 0805
C705
VCC12V 1000pF
VCTRL
R703 C706
CN701 62K 1/10W 0.001uF R717
FB701 U702
1+12V_IN 1 6 5 1 51 1/10W
2 5 ADJ ISENSE VCC1.8
3 4 6 2
+ + R701 PWGND AGND C724
2
C701 C702 VCC1.8 4
JACK BEAD 39K 1/10W C704 7 3
0.001uF PGATE N.C D703 SMAL140 4.7uF/16V
220uF/16V 220uF/16V
8 4 R704
VIN FB 20K 1/10W C707
0.0047uF
LM3485 Q705 R718
PZT2907A
2K 1/10W
D705 D704
SMAL140
VCC12V
VCC12V VCC12V_AUDIO
R719 VCC3.3
C713 +
VCC12V_AUDIO 8
C714 FB704 FB703 120 OHM 100 1/10W
0.1uF VCC5V
VCC3.3 4
220uF/16V
VCC5V
CN702 R721 TO-263
VCC3.3
6 10K 1/10W U703
5
4 ON_OFF R720 4.7K 1/10W 3 2
VIN VOUT VCC3.3 5
3
2 1
1 R722 4.7K 1/10W ADJ C716 +
C715 Q701 C717 C718
0.1uF onBACKLITE 7 0.1uF 0.1uF
PMBS3904 AIC1084-33PM 47uF/16V
VCC3.3 VCC5V
CONN
R723 R705
NC 1K 1/10W
R724 NC
R706
1K 1/10W
R707
+ C719