Acer AL2251W Service Guide 1
Service Guide Version and Revision Version A00 Release Date Revision History TPV model Initial Release TC6MMADKWGAGACP Sep-29-2006 2
Copyright Copyright © 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.
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).
Precautions z Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool or in a wet basement. z 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.
Table Of Contents Chapter 1 Chapter 2 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 ……
Chapter 1 Monitor Features 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.
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 All specifications : ＞30 minutes Fully functional : 5 seconds Measuring equipment : Chroma 7120 signal generator or equivalent, directly Warm up time Connected to the monitor under test.
LCD Monitor General Specification 9
LCD Panel Specification LCD Panel Model (M220Z1-L01) General Specifications Mechanical Specification 11
Optical Specifications Test Conditions 12
Supported Timing VESA MODES Horizontal Mode VGA SVGA XGA SXGA WSXGA Resolution Total Vertical Nominal Sync Nominal Sync Nominal 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 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.
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.
Main Board Diagram MAIN BOARD DIAGRAM VCC3.3V VAA2 AT24C02 (DDC)U301 DDC CLK1/DAT1 VCC1.
Software Flow Chart 1 Y 2 3 N 4 N 5 Y 6 N 7 8 Y 9 N 10 11 Y N 12 N 13 Y Y 14 15 Y 17 18 N 19 Y 16 N 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.
Main Board Layout Symbol Description Symbol Description U401 IC TSUMU58WHJ-LF PQFP-128 U702 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.
Chapter 2 Adjusting the viewing angle • 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. • Hold the stand so you do not topple the monitor when you change the monitor’s angle. • 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.
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.
Chapter 2 Operating 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 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. External Controls Item Description Item Description 1. >/ Volume 4.
Front Panel Control • Power Button: Press this button to turn the monitor ON or OFF. And display the monitor’s state. • 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. •
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.
b.
Hot-Key Menu a. Outline b. The Description For Hot-Key Function Item Operation Icon When the OSD is closed, press Left or Description 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.
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 I²C protocol.
Chapter 3 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 connector wire with base and panel, base and inverter.
3. Remove the base stand. (Fig 3) 4.Remove the screws to release front bezel.
5. Remove the hinge cap. (Fig 5) 6. Remove eleven screws to release top cover and bottom cover.
7. Remove the main board. (Fig 7) 8. Remove six clamps to release shield and the main board.
9. Removefour screws connect with panel to remove the main frame. (Fig 9-10) 10.Remove the screws to remove the inverter board.
Chapter 4 Troubleshooting 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 OK Reinsert or check the Adapter/Inverter Measure U201 PIN2=2.5V U202 PIN2=3.
2. No Picture No picture NG The button if under control X601 oscillate NG waveform is normal Replace X601 OK OK Check reset circuit of U601 is normal Measure U201 PIN2=2.5V U202 PIN2=3.
3. White Screen White screen NG Measure Q204 base is low level? X601 oscillate waveform is normal OK OK Check Q204 is broken or CN503 solder? NG Replace X601 Check reset circuit of U601 is normal NG NG Check Correspondent component. OK OK Replace PANEL Replace U601 4. Keypad Board 35 Check Correspondent component.
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6.
Chapter 5 Connector Information 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.
Chapter 6 FRU (Field Replaceable Unit) List 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/).
Exploded Diagram (Model: AL2251W) 40
Part List Above picture show the description of the following component.
6 Panel 7 Power Board 8 Main Board 9 Speakers 42
Chapter 7 Schematic Diagram Main Board Top TSUMU58J-SCHEMATIC 4.SCALER B1 TXD RXD DDCA_SCL DDCA_SDA DDC_WP ST_DET1 ST_DET2 RIN GNDR GIN GNDG SOG BIN GNDB HSYNC VSYNC RIN GNDR GIN GNDG SOG BIN GNDB HSYNC VSYNC VCC1.8 DDCD_SCL DDCD_SDA HPD_CTRL VCC3.3 VCC1.8 R+ RG+ GB+ BCLK+ CLK- R+ RG+ GB+ BCLK+ CLK- VCC3.3 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 6.AUDIO VCC12V_AUDIO VCC12V_AUDIO VCC3.3 VCC1.8 PA[0..
Power VCC5V 1 2 3 4 C703 U701 S S S G 0805 L701 2.2UH 8 7 6 5 D D D D D701 SBM84PT D702 R702 SBM84PT 22 1/8W FB701 1+12V_IN 1 2 3 R703 62K 1/10W U702 6 5 4 5 2 + 6 R701 39K 1/10W + C701 220uF/16V BEAD JACK C708 220uF/16V + + + C709 C710 C711 220uF/16V 220uF/16V 220uF/16V C712 1000pF 0805 C705 1000pF VCC12V CN701 + AM4811P-T1-PF C702 220uF/16V C704 0.001uF 7 8 ADJ ISENSE PWGND AGND PGATE N.C VIN FB VCTRL C706 0.001uF R717 1 51 1/10W VCC1.
Input R301 100 1/10W C301 0.047uF 1/10W R302 100 1/10W C302 0.047uF FB303 0 1/10W R303 100 1/10W C303 0.047uF R304 470 1/10W C304 0.047uF R308 100 1/10W C308 0.047uF R309 100 1/10W C309 0.047uF R310 100 1/10W C310 0.
Scaler AVDD_33 VDDC AVDD_MEMPLL_33 AVDD_18 VDDP FB403 VCC3.3 2 VCC3.3 VDDP 600 OHM DDCA_SDA DDCA_SCL R402 NC AVDD_33 R403 390 0.1uF 58 21 54 114 40 59 87 107 112 VDDP VDDP VDDP VDDP VDDP VDDP VDDP VDDP 53 74 104 126 LVB4P LVB4M LVB3P LVB3M LVBCKP LVBCKM LVB2P LVB2M LVB1P LVB1M LVB0P LVB0M REXT 31 C401 VCC3.
Panel Interface CN402 PA[0..9] PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PA8 PA9 5 PB[0..9] LVA3P LVA3M LVACKP LVACKM LVA2P LVA2M LVA1P LVA1M LVA0P LVA0M PB[0..
Audio VCC12V_AUDIO 3 VCC12V_AUDIO + C601 220uF/16V C603 0.1uF + C602 220uF/16V 1/10W R602 18K C604 0.47uF/16V 4 C606 0.
Power board F801 1/4W R810 39 1/8W 4 3 2 1 LL4148 1 4 6 R811 9.1K 1 2 D806 LL4148 SST 3 C810 330pF OP2 1 C838 4.7uF/16V C808 4.7uF/16V D807 BAV99PT 1/10W 1 2 5 6 7 8 39 Q815 AM4910N-T1-PF D811 LL4148 4 6 PT804 POWER X'FMR Q809 PMBS3904 0 R841 1/10W R832 9.
