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Acer AL1921 Service Manual

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Acer AL1921
Service Guide
Service guide files and updates are available
on the CSD web; for more information,
please refer to



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  • Page 1 Acer AL1921 Service Guide Service guide files and updates are available on the CSD web; for more information, please refer to
  • Page 2 Copyright Copyright © 2004 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.
  • Page 3 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.
  • Page 4 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.
  • Page 5 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.
  • Page 6 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.
  • Page 7 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 •...
  • Page 8: Table Of Contents

    Table Of Contents Chapter 1 Monitor Features ……………………………………………. 8 Monitor Features …………………………………………… Electrical Requirements …………………………………………… LCD Monitor General Specification …………………………………………… LCD Panel Specification …………………………………………… Support Timing …………………………………………… Factory Preset Timing Table …………………………………………… Block Diagram …………………………………………… Main board Diagram …………………………………………… Software Flowchart ……………………………………………...
  • Page 9: Chapter 1 Monitor Features

    Chapter 1 Monitor Features AU EN02 SEC E1-L01 Driving TFT Color LCD TFT Color LCD system 48cm(19.0") Size 48cm(19.0") Pixel pitch 0.294mm( H )x 0.294mm( V ) 0.294mm( H )x 0.294mm( V ) 250cd/m (Typical) 250cd/m (Typical) Brightness LCD Panel 500:1(Typical) Contrast 700:1(Typical)
  • Page 10 • Auto Adjust Key • Auto Adjust Key • </Volume • </Volume Switch • >/ Volume • >/ Volume • Power Button • Power Button • MENU/ Exit • MENU/ Exit • Contrast • Contrast • Brightness • Brightness • Focus •...
  • Page 11: Electrical Requirements

    Electrical Requirements Standard Test Conditions All tests shall be performed under the following conditions, unless otherwise specified. Ambient light : 225 lux Viewing distance : 40 cm in front of LCD panel 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.
  • Page 12: Lcd Monitor General Specification

    LCD Monitor General Specification Panel type: 19 “ active matrix color TFT LCD 1). AU EN02 Display size: 376.32mm (H) × 301.056mm(V) Display mode: VGA 640 × 480 (60//72/75 Hz) SVGA 800 × 600 (56/60/72/75 Hz) XGA 1024 × 768 (60/70/75 Hz) SXGA 1280 ×...
  • Page 13: Lcd Panel Specification

    LCD Panel Specification LCD Panel Model (SEC E1-L01) Display Type active matrix color TFT LCD Resolution 1280x1024 pixels Display Dot 1280x (RGB) x 1024 Display Area 376.32mm(H) x 301.056mm(V) Pixel Pitch 0.294mm(H) x 0.294mm(V) Display Color 16.7M (true) Lamp Frequency 80kHz Lamp Current 7.0 mArms (typ)
  • Page 14 Panel Relative Humidity Input Signals Video input Type Analog R, G, B. Input Impedance 75 ohm +/- 2% Polarity Positive Amplitude 0 - 0.7 +/- 0.05 Vp Display Color same as LCD panel Sync input Signal separate horizontal and vertical sync, or composite sync which are TTL compatible Polarity positive and negative.
  • Page 15: Support Timing

    Supported Timing SYNC FRONT BACK PIXEL FH(KHZ)/ SYNC TOTAL ACTIVE TIMING WIDTH PORCH PORCH FOREQ. FV(HZ) POLARITY (DOT/LINE) (DOT/LINE) (DOT/LINE) (DOT/LINE) (DOT/LINE) (MHZ) 640x350 37.9/70 25.175 /DOS 31.5/59.9 25.175 640x480 37.9/72.8 31.5 37.5/75 31.5 35.2/56.3 1024 36.0 800x600 37.9/60.3 1056 40.0 SVGA 48.1/72.2...
  • Page 16: Block Diagram

    Monitor Block Diagram The LCD MONITOR will contain an main board, an inverter/power board, keypad board and internal adapter 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-264V)
  • Page 17: Main Board Diagram

    MAIN BOARD DIAGRAM VAA2 VAA4 VCC3.3V AT24C02 VCC2.5V VAA1 VAA3 (DDC)U301 DDC SCL/SDA VGA R/G/B VGA Input PA 0~9 VGA Hsync/Vsync AT24C02 PB 0~9 RXD/TXD (DDC)U302 U401 Panel HS/VS MST 8131B U601 Winbond Signal VLCD EPR SDA/SCL AT24C16 KEY Control U602...
  • Page 18: Software Flowchart

    Software Flow Chart 1) MCU initialize. 2) Is the eeprom blank? 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? 6) Clear all global flags.
  • Page 19: Main Board Layout

    Monitor Board Layout...
  • Page 20 Label Component U201 RT9164-25CL U202 AIC1084-33CM U301 M24C02-WMN6T SMT U302 M24C02-WMN6T SMT U401 MST8131B PQFP-12 U602 AT24C16N-10SC-2.7 U603 MAX810STR SOT-23 U601 W78E65P-40 X401 CRYSTAL 14.318MHzHC-49US X601 20MHZ CN201 WAFER 2*6P 2.0MM R/A CN601 PIN HEADER 2*7P 2.0mm CN602 WAFER 16PIN 2.0mm DIP CN503 PIN HEADER 24P 2.0mm CN301...
  • Page 21: Mechanical Specification

    Mechanical Specification The step between front bezel and back cover shall be within specification. Top and Bottom Left and Right Back cover & Bezel concavity Back cover & Bezel concavity 0.8mm ≤ A ≤ 1.3 mm 0.8mm ≤ A ≤ 1.3 mm Back Cover &...
  • Page 22 Top and Bottom Left and Right Back cover & Bezel step Back cover & Bezel step 0mm ≤ D ≤ 0.8 mm 0mm≤ D ≤ 0.8 mm LCD Horizontally The angle between front bezel and LCD unit in bottom side should not large than 1.0mm. The distance of the LCD display unit from left side to right should not large than 4.0mm.
  • Page 23 Tilt Base Rotation Tilt up 15 ± 2°/ down 5 ±2° Plastic Material For TCO99 Front Bezel ABS 94HB Back Cover ABS 94HB The Others ABS 94HB For MPRII Front Bezel ABS 94HB Back Cover ABS 94HB The Others ABS 94HB GAP Spec.
  • Page 24: Front Bezel

    Front Bezel Item Description VEDIO (UP) VEDIO (DOWM) POWER MENU/ENTER AUTO/EXIT...
  • Page 25: Rear Bezel

    Rear Bezel Item Description D-SUB Cable DVI CABLE AUDIO CABLE AC POWER CORD...
  • Page 26: Chapter 2 Operating Instructions

    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.
  • Page 27 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. Power Indicator: •...
  • Page 28: Osd Menu

    Adjusting The Picture Main OSD Menu : a. Outline: I. Analog-Only Model II. Dual-Input Model, Analog Signal Input III. Dual-Input Model, Digital Signal Input...
  • Page 29 b. The Description For Control Function : Main Menu Sub Menu Description Adjustmen Reset Value Icon Item Menu t Range Icon Contrast Contrast from Digital-register. 0-100 Recall Cool Contrast Value Brightness Backlight Adjustment 0-100 Recall Cool Brightness Value Focus Adjust Picture Phase reduce...
  • Page 30 Auto Config Auto Adjust the H/V Position, Focus and Clock of picture. (Analog-Only Model) Analog Select input signal from analog (D-Sub) Digital Select input signal from digital (DVI) (Dual-Input Model) Information Show the resolution, H/V frequency and input port of current iput timing. Reset Clear each old status of Auto-configuration and set the color temperature to Cool.
  • Page 31: Hot-Key Menu

    Hot-Key Menu: a. Outline: b. The Description For Hot-Key Function : Item Operation Icon Description Adjustment Reset Range Value Volume When the OSD is closed, press Left or Volume of Audio adjustment. The Audio will 0-100 Right button will be Volume Hot-Key be Mute when volume=0.
  • Page 32: Logo

    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.
  • Page 33: Update The Firmware

    Please note that power supply cord needs to use VDE 0602, 0625, 0821 approval power cord in European counties. Update the firmware 1.Tools: a. ISP Kit (Prepared by CMO) picture 1 b. RS232 Comport Cable -- picture 2 c. D-sub Cable d.
  • Page 34 Step2---join RS232 Monitor cable,and Adapter Connect to monitor Connect to PC Connect to adapter Connect to chroma Step3—When the LED turns Green, It will start running...
  • Page 35 3.Program Runnig Before update the firmware ,please power on the monitor, in this time,please push your finger to control the keyswitch(left: ” , right ”, insert and draw the DC power ,the interface “< “> will appear “ISP” mode. Step1-Open the ISP tool. And Select the MCU type...
  • Page 36 Step2—Select Bank where is the new firmware ?
  • Page 37 Step3—Choose the File Format a: when you already choose the New firmware ,a small pane appear “File Format”,please choose the “inte he”, no“Binary ”,and following choose the “OK”...
  • Page 38 Step4-- Select the communication Setting: Port Name,the “Port ”the same your PC COM”...
  • Page 39 Step5-- Click the “ConNect” button.
  • Page 40 Step6-- Before Executing ISP,the interface change as below Click “Program All” button that will execute erase and program...
  • Page 41 Step7—ISP is processing.
  • Page 42 Step8-- Then you can get the window as follow, and Program ok.
  • Page 43 Step9--Click “verify” button that will execute verify action. Then you can get the window as follow, and click ok.After update the program of APROM, must remove the Reboot Mode condition.
  • Page 44: Chapter 3 Machine Disassembly

    Chapter 3 Machine Disassembly This chapter contains step-by-step procedures on how to assemble the monitor for maintenance. Disassembly Procedure Disassemble the base 1. Remove the neck cover. 2. Remove the four screws to release the hinge. 3. Remove the base Disassemble the chassis 1.
  • Page 45 NOTE: 1.The screws for the different components vary in size. During the disassembly process, group the screws with the corresponding components to avoid mismatch when putting back the components. 2. Note: The monitor surface is susceptible to scratching!Therefore,lay the monitor on a soft surface when mounting or removing the base.
  • Page 46: Chapter 4 Troubleshooting

    Chapter 4 Troubleshooting This chapter provides troubleshooting information for the AL1921: Main Board 1. No Screen Appear Measured U201 pin 2 = 2.5 V? Check Correspondent component. Measured U202 pin 2= 3.3V? Is there any shortage or cold solder? Check Power Board.
  • Page 47 2.Panel-Power Circuit Check the PPWR panel power relative circuit, Q301, Q302(pin 5,6,7,8) Check R302 should have response In normal operation, when LED =green, R302 from 0V to 5V should =0 v, When we switch the power switch If PPWR no-response when the power switch from on to off Turn on and turn off, replace the U203-MST8131B OK,R308 have response...
  • Page 48 4.U602-Data Output NG , no transition Measured DCLK(R240)DVS, DHS (pin 117,116 from U203 ) Is the waveform ok? Replace MST8131B (U401) or DCLK around 48 MHZ , DVS=60.09Hz , DHS around 80 replace MAINBOARD. KHz ?(refer to input signal=640x480@60 Hz 31k, and LED is Green) Check U203 MST8131B, Signal output If MainBoard being replace , please...
  • Page 49 Power/Inverter Board 1.) No Power Check to CN102 Pin1 and pin2 = 5V Check Interface board Check AC line volt 120V or 220V Change F901 , check BD901,Q903,IC901 Check the voltage of C905(+) Check bridge rectified circuit cFailure Check start voltage for the pin3 of IC901 Repeating the start voltage Change IC901 Check the auxiliary voltage is smaller than 20V...
  • Page 50 2.) W / LED , No Backlight Check C201(+) =12V Change F902 Check D201/Q209/Q210 or D202/Q211/Q212 Check ON/OFF signal Check Interface board Check U201 pin9=12V pin9=12vvoltage of C905(+) Change Q201 or Q202 Check the pin1 of U201 have sawtooth wave Change U201 Check D201(-),D202(-) have the output of square wave at short time.
  • Page 51 KeyPad Board OSD is unstable or not working Is KeyPad Board Connect KeyPad Board ll ? Replace Button Switch Is Button Switch normally ? Is KeyPad Board Normally ? Replace KeyPad Board Check Main Board...
  • Page 52: Chapter 5 Connector Information

    Chapter 5 Connector Information The following figure shows the connector locations on the monitor board: 15 - Pin Color Display Signal Cable(D-sub) PIN NO. DESCRIPTION PI N NO. DESCRIPTION Green Ground Blue Ground Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground...
  • Page 53: Chapter 6 Fru (Field Replacement Unit) List

    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.
  • Page 54 Note: Above picture show the description of the following component Item Picture Description Part No. HOLDER CABLE W33L4633-GD-X 20L003-1 SCREW M1L 330 6120 SCREW Q1L 130 6120 FOOT-PORON 12L 394 3 BASE 34L1337-GD-B BASE PLATE 15L8022 -1 HINGE 37L-498 -1 SHIELD 85L-666-1 MAIN FRAME...
  • Page 55: Chapter 7 Schematic Diagram

    Chapter 7 Schematic Diagram Analog And Digital Input CN301 DB15 FB301 1/16W R301 1/16W C304 0.047uF FB302 1/16W R302 1/16W C305 0.047uF FB303 1/16W R303 1/16W C306 0.047uF R304 1/16W C307 0.001uF PC5V R325 C301 C302 C303 VGA_CON 1/16W R305 1/16W C308 0.047uF GNDR...
  • Page 56: Lvd-S

    VPLL VDVI VDPLL C406 C407 C408 C409 C410 C411 C412 C413 C415 C416 C417 C418 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF U401 MST8116B RIN0 LVA3p/GA3P GNDR RIN0M LVA3M/GA3N GIN0 LVACKP/NC GNDG GIN0M LVACKM/NC SOGIN0 LVA2P/RA1P BIN0 LVA2M/RA1N...
  • Page 57: Key Board Connector

    R414 Brightness PWM0 Q401 LED_GRN R416 D402 PWM0 PMBS3906 0 1/16W R411 1K 1/16W 330 1/16W LED_GRN ACER GM5120/2120 R425 R424 C413 22uF/16V Title K.B AND CONNECTOR LED_BLUE# Size Document Number 715L1123-A Date: Monday, May 12, 2003 Sheet NEW ADD CIRCUIT FOR 4 LED 04/09...
  • Page 58: Audio

    Audio VCC12V_AUDIO VCC12V_AUDIO C701 C702 C703 470uF/16V 470uF/16V 0.1uF R702 タ U701 TDA7496L MUTE AUDIO_SD CN701 EAR_L R701 10K 1/16W C704 0.47uF/16V C705 470uF/16V OUTL OUT_L R703 C706 0.47uF/16V C707 470uF/16V OUT_R OUTR D701 1/16W R704 1/16W EAR_R VOLUME R705 PHONEJACK D702 LL4148...
  • Page 59: Appendix

    Appendix Online Support Information This section describes online technical support services available to help you repair your Acer Systems.If you are a distributor, dealer, ASP or TPM, please refer your technical queries to your local Acer branch office. Acer Branch Offices and Regional Business Units may access our website.