Related Manuals for Acer AL1721h
Summary of Contents for Acer AL1721h
- Page 1 Acer AL1721h Service Guide Service guide files and updates are available on the CSD web; for more information, please refer to http://csd.acer.com.tw...
- Page 2 Copyright Copyright © 2003 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 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.
- 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.
- 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.
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Page 7: Special Notes On Lcd Monitors
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. -
Page 8: Table Of Contents
Table Of Contents Chapter 1 Monitor Features ……………………………………………. 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 SAMSUNG(Option) Driving TFT Color LCD TFT Color LCD system 43.2cm(17.0") LCD Panel Size 43.2cm(17.0") Pixel pitch 0.264mm( H )x 0.264mm( V ) 0.264mm( H )x 0.264mm( V ) 250cd/m (Typical) 260cd/m (Typical) Brightness 350:1(Typical) Contrast 450:1(Typical) Viewable 140°... - 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 •...
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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: 17 “ active matrix color TFT LCD 1). AU EN05 Display size: 337.92mm (H) × 270.34mm(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 Lamp Voltage 700 Vrms (typ) Lamp Current 6.5 mArms (typ) Weight 2000g (typ) Optical Specifications = 7.0mA = 25 ± 2°C = 5V = 60Hz = 54MHz DCLK ITEM Symbol Condition MIN. TYP. MAX. UNIT Contrast Ratio (Center of screen) Response Rising (total)
- 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.
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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 /DOS 37.9/70 25.175 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. -
Page 17: Main Board Diagram
MAIN BOARD DIAGRAM VCC3.3V VAA2 VAA4 AT24C02 VCC2.5V VAA1 VAA3 (DDC)U104 DDC SCL/SDA VGA R/G/B VGA Input PA 0~9 VGA Hsync/Vsync AT24C02 PB 0~9 RXD/TXD (DDC)U102 U203 Panel HS/VS GM5120 U601 Winbond Signal VLCD EPR SDA/SCL AT24C16 KEY Control U602... -
Page 18: Software Flowchart
Software Flow Chart MCU initialize Program the eeprom Is the eeprom blank ? by default values. Get the PWM value of brightness from eeprom. Is the power key pressed ? Clear all global flags. AUTO Enter factory mode. SELECT keys pressed ? Save the power key status into eeprom.Turn on the LED and set it to green color.Scaler initialize. -
Page 19: Main Board Layout
Monitor Board Layout... - Page 20 Label Component TDA7496L BY ST U102 M24C02-WMN6T SMT U104 M24C02-WMN6T SMT U106 74LCX14MX S014 FAIRCHIL U201 TL1451ACD U202 A290011TL-70 U203 SCALER IC gm5120(V:BD) U204 M24C16-MN6T U301 THC63LVDM83R U302 THC63LVDM83R U501 AIC1117-33CY U502 AIC1117-33CY U503 RT9164-25CL CN101 DVID CONN. 24P FEMALE CN102 D-USB 15PIN CN301...
- Page 21 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 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. Tilt Base Rotation Tilt up 15 ±...
- Page 23 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. Gap between panel with bezel is 0 mm < gap < 1.2 mm...
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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 DC-Jack Power Cable AC POWER CORD EXTERNAL ADAPTER DVI CABLE AUDIO CABLE... -
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 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: Green — Power On mode. Orange —...
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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 Sub Menu Description Adjustment Reset Value Icon Item Icon Range Contrast Contrast from Digital-register. 0-100 Recall Cool Contrast Value Brightness Backlight Adjustment 0-100 Recall Cool Brightness Value Focus Adjust Picture Phase to reduce Horizontal-Line 0-100 Do Auto Config noise...
- Page 30 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. Exit Exit OSD...
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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 Right Volume of Audio adjustment. The Audio will be 0-100 button will be Volume Hot-Key Function 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: 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 To stick the insulated film on the mainframe and the shield 2. - Page 34 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.
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Page 35: Chapter 4 Troubleshooting
Chapter 4 Troubleshooting This chapter provides troubleshooting information for the AL1721h: Main Board 1.No Screen Appear Measured U503 pin 2 = 2.5 V? Check Correspondent component. Measured U502 pin 2= 3.3V? Is there any shortage or cold solder? Measured U501pin 2 =3.3V? Check Power Board. - Page 36 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-GM5120/2120 OK,R308 have response...
- Page 37 4.U203-Data Output NG , no transition Measured DCLK(R240)DVS, DHS (pin 117,116 from U203 ) Is the waveform ok? Replace GM5120 (U203) or replace DCLK around 48 MHZ , DVS=60.09Hz , DHS around 80 MAINBOARD. KHz ?(refer to input signal=640x480@60 Hz 31k, and LED is Green) Check U203 gm2120, Signal output If MainBoard being replace , please...
- Page 38 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 39 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.
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Page 40: Keypad Board
KeyPad Board OSD is unstable or not working Is KeyPad Board connecting Connect KeyPad Board Replace Button Switch Is Button Switch normally ? Is KeyPad Board Normally ? Replace KeyPad Board Check Main Board... -
Page 41: 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 42: Chapter 6 Fru (Field Replacement Unit) List
Note: To scrap or to return the defective parts, you should follow the local goverment ordinance or regulations on how to dispose it properly, or follow the rules set by your regional Acer office on how to return it. - Page 43 Note: Above picture show the description of the following component Item Picture Description Part No. VESA COVER 33L4700-GD-L 33L4701-GD-L Stand 34L1279-GD-L SCREW M1L 330 6120 SCREW Q1L 130 6120 FOOT-PORON 12L 394 3 VESA BRACKET 15L5791 1 BASE PLATE 15L5981 1 HINGE 37L 491 1 SHIELD...
- Page 44 Item Picture Description Part No. REAR COVER 34L1188AGD 2B LIFT HOLDER 33L4696 GD L SPRING HOLDER 33L4698-GD-X 34L1280-GD-B STAND LIFT...
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Page 45: Chapter 7 Schematic Diagram
M24C02WMN6 100 1/16W ZD102 ZD103 MLL5232B 5.6V MLL5232B 5.6V R104 C122 R105 0.1uF/16V 4.7K VGA_CON VGA_PLUG D114 D113 BAV99 BAV99 ZD110 MLL5232B 5.6V ACER GM5120/2120 RXC+ RXC- Title ANALOG&DIGITAL INPUT Size Document Number 715L1123-A Date: Monday, May 12, 2003 Sheet... -
Page 46: Gm5120/Gm2120
GPIO(22:16) is on "Host Port" pins ROM_ADDR9 OCM_START 1 = OCM becomes active after OCM_CLK is stable NEW ADD CIRCUIT FOR 2M ROM04/08 C254 R245 ACER GM5120/2120 ROM_ADDR(12:10) USER_BITS(7:5) Available for reading from a status register 2003/02/21 EMI SOULATION ADD C254 0.1uF/16V... -
Page 47: Lvd-S
TXIN23 C321 TXIN24 0.1uF/16V TXIN25 +P5V PDEN TXIN26 PCLK1 C320 TXCLKIN Q301 100pF R_FB PPWR PMBS3904 Q302 R302 SI9933ADY-T1 4.7K THC63LVDM83R R308 ACER GM5120/2120 ACER Title GM5120/2120 LVDS Interface Size Document Number Custom 715L1123-A Date: Monday, May 12, 2003 Sheet... -
Page 48: Key Board Connector
PWM0 PMBS3906 0 1/16W R411 1K 1/16W 330 1/16W LED_GRN R425 R424 ACER GM5120/2120 C413 22uF/16V Title K.B AND CONNECTOR LED_BLUE# Size Document Number 715L1123-A NEW ADD CIRCUIT FOR 4 LED 04/09 Date: Monday, May 12, 2003... -
Page 49: Audio
150uF/25V OUT(R) C20 68PF 2003/02/21 EMI SOULATION NEW C17~C20 68PF VOL 3 2.7K 1/16W 100pF 100pF 10K 1/16W 10K 1/16W 0.1uF/16V ACER GM2120 GM5120/2120 Title 6. AUDIO Size Document Number 715L1123-A Date: Monday, May 12, 2003 Sheet... -
Page 50: Dc Power
0.01uF C. 150 uF 25V CHANGE DIP SIZE TO-252 D2.5V U503 VOUT C523 C526 C528 C524 C525 C527 RT9164 100uF/16V 0.1uF/16V 0.01uF 47uF/16V 0.1uF/16V 0.01uF ACER GM5120/2120 Title DC POWER Size Document Number 715L1123-A Date: Monday, May 12, 2003 Sheet... -
Page 51: Appendix
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. However some sources will require a user i.d.