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Acer AL2251W Service Manual

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Acer AL2251W
Service Guide
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Summary of Contents for Acer AL2251W

  • Page 1 Acer AL2251W Service Guide...
  • Page 2 Service Guide Version and Revision Version Release Date Revision History TPV model Mar.-30-2007 Initial Release TC7AMUDBWGAGAC...
  • Page 3 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.
  • Page 4 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.
  • Page 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.

  • Page 6: Table Of Contents

    Table Of Contents Chapter 1 Monitor Features ………………………………………… Introduction ……………………………………… Electrical Requirements ……………………………………… LCD Monitor General Specification ……………………………………… LCD Panel Specification ……………………………………… Support Timing ……………………………………… Monitor Block Diagram ……………………………………… Main Board Diagram ……………………………………… Software Flow chart ……………………………………… Main Board Layout ………………………………………...

  • Page 7: Chapter 1 Monitor Features

    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 M220EW01 V2 Panel...

  • Page 8: Electrical Requirements

    Electrical Requirements Standard Test Conditions All tests shall be performed under the following conditions, unless otherwise specified. Ambient light Dark room 40 cm for LCD performance, 20 cm for LCD failures Viewing distance Warm up time ＞30 minutes All specifications Fully functional 5 seconds Measuring equipment...

  • Page 9: Lcd Monitor General Specification

    LCD Monitor General Specification...

  • Page 11: Lcd Panel Specification

    LCD Panel Specification General Specifications...
  • Page 12 Optical Specifications...

  • Page 13: Support Timing

    Supported Timing...

  • Page 14: Monitor Block Diagram

    Monitor Block Diagram The LCD MONITOR will contain a main board, a power board, and key 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 provide the 12V DC-power to inverter/power board.

  • Page 15: Main Board Diagram

    Main Board Diagram LCD Interface Crystal 24MHZ Scalar MST9259BH-LF Crystal (Include: ADC, OSD etc) 14.318MHZ MTV416GMV EEPROM AT24C16N D-SUB Connector Connector OSD Control Interface (Keypad) EEPROM EEPROM 24C02 24C02...

  • Page 16: Software Flow Chart

    Software Flow Chart...
  • Page 17 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.

  • Page 18: Main Board Layout

    Main Board Layout Symbol Description Symbol Description U303 EM6A9320BI-5MG FBGA-144 X401 CRYSTAL 14.318MHzHC-49US U403 M24C16-WMN6TP CN101 D-SUB 15PIN U402 MTV416GMV RN102 DVI CONNECTOR 24PIN U705 IC AIC1084-33PMTR-R AIC CN701 DC JACK 3PIN U405 CAT24WC08W SOIC-8 CN702 WAFER 6P RIGHT ANGLE PITCH 2.0 U706 AZ1117D-2.5-E1 CN407...

  • Page 19: Adjusting The Viewing Angle

    Adjusting the viewing angle • 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. •...

  • Page 20: Rear Bezel

    Rear Bezel Item Description Item Description D-SUB Cable External Adapter DC-Jack Power Cable DVI Cable AC Power Cord Audio cable...

  • Page 21: 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. •...

  • Page 22: Front Panel Controls

    Front Panel Control • Power Button: Press this button to turn the monitor ON or OFF. And display the monitor’s state. • Power Indicator: Blue – Power On mode Orange – Stand by mode. • 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 .

  • Page 23: Adjusting The Picture

    Adjusting the Picture How to Adjust a Setting 1. Press the MENU-button to activate the OSD window. 2. Press <or >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.
  • Page 24 b. The Description For Function Control LEDS...

  • Page 26: Hot-Key Menu

    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.

  • Page 27: 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 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.

  • Page 28: Chapter 3 Machine Disassembly

    Chapter 3 Machine Disassembly This chapter contains step-by-step procedures on how to disassemble the monitor for maintenance. Disassembly Procedure 1. Remove the hinge cover of base stand and remove the screws. Then remove the back cover (Fig1-2) Fig 1 Fig 2...
  • Page 29 2. Remove the screws to release base stand. (Fig 3) Fig 3 3. Remove the screws to remove the front bezel. (Fig 4) Fig 4...
  • Page 30 4. Remove the shield. (Fig5) Fig 5 5. Remove the screws to remove the inverter board. (Fig 6 - 7) Fig 6...
  • Page 31 Fig 7 6. Remove the screws to remove the frame of the panel. (Fig 8-9) Fig 8 Fig 9...
  • Page 32 Fig 10 7. Remove the screws to remove the base back cover. (Fig 11-12) Fig 11 Fig 12...
  • Page 33 8. Remove the screws to remove the base farther. (Fig 13) Fig 13 9. Remove the screws to remove the INPC wire, LVD wire, speaker wire. (Fig 14 ) Fig 14...
  • Page 34 10. Remove the screws to remove the main board. (Fig 15-16) Fig 15 Fig 16...

  • Page 35: Chapter 4 Troubleshooting

    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 Please reinsert and make sure the AC of 100-240 is normal Reinsert or check the...
  • Page 36 2. No Picture No picture Measure U701 PIN2=12V U702 PIN2=3.3V, U705 PIN2=3.3 Replace U701, U702, U705 Check if X401, X402 oscillate waveforms are normal Replace X401, X402 Check if the sync signal from computer is output and video cable is connected normally Input the sync signal of computer, or change the cable Replace U401...
  • Page 37 3. Panel Power Circuit Check the PPWR panel power relative circuit,Q702, Q705 Check CN407 PIN 23-24 should have Q703 In normal operation, when LED =green, R726 response from 0V to 5V When we Should =5 V, switch the power switch from on to off If PPWR no-response when the power switch Turn on and turn off, replace the U401-MST9259BH-LF Replace panel...
  • Page 38 5. No Backlight Check C802 (+) =12V Change F801, Check Q803 Check ON/OFF signal Check Interface board Check IC801 pin2=5V ? Change Q801.Q802 or Q803 Check the pin1 of IC801 have PWM wave Change IC801 Check D801 (-) has the output of square wave at short time. CheckQ805/Q807/Q803/Q801or /Q806/Q808/Q804/D802 Check the resonant wave of pin2 &...

  • Page 39: Chapter 5 Connector Information

    Chapter 5 Connector Information The following figure shows the connector locations on the monitor:...

  • Page 40: Chapter 6 Fru (Field Replacement Unit) List

    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.

  • Page 41: Exploded Diagram

    Exploded Diagram (Model: AL2251W)

  • Page 42: Part List

    Part List Above picture show the description of the following component. Item Picture Description Back Cover Base back cover Hinge cover Panel...
  • Page 43 Inverter Board Main Board Speaker...

  • Page 44: Chapter 7 Schematic Diagram

    Chapter 7 Schematic Diagram Main Board MST9259V SCHEMATIC GNDR GNDR +1.8V_VDD GNDG GNDG DDC_CLK +2.5MVDD DDC_DAT DDC_WP GNDB GNDB +3.3DVDD ST_DET1 HSY NC HSY NC ST_DET2 VSYNC VSY NC +3.3AVDD VLCD DVI_CLK DVI_DAT VLCD HDCP_RST +3.3AVDD CLK+ CLK+ CLK- CLK- +3.3DVDD +2.5MVDD 3.INPUT...
  • Page 45 VCC5V VCC12V VCC5V VCC5V VLCD L701 VLCD VCC5V VCC12V R702 R703 R704 L701A1 U701 2.2UH 1/16W R705 R707 VCPU FB701 R708 51K 1/16W Q701 D703 D704 R721 AO3401L 1/16W VCPU C710 SBM84PT SBM84PT 1/10W C740 1uF/25V C706 C707 C708 C709 1000pF R709 4.7K 1/16W...
  • Page 46 DB15 FB101 1/16W R102 1/16W C102 0.047uF FB102 1/16W R103 1/16W C103 0.047uF FB103 1/16W R104 1/16W C104 0.047uF R105 1/16W C105 0.001uF PC5V R101 C101 C106 C107 VGA_CON 1/16W D101 D102 R108 1/16W C108 0.047uF GNDR LL5232B 5.6V 5% LL5232B 5.6V 5% CN101 R109...
  • Page 47 +3.3AVDD +3.3AVDD 3 +2.5MVDD +2.5MVDD 3 AVDD_ADC AVDD_LPLL AVDD18_DVI AVDD18_ADC +2.5MVDD VDDM +3.3AVDD +3.3DVDD +1.8V_VDD +1.8V_VDD +3.3DVDD +3.3DVDD 3 +1.8V_VDD +1.8V_VDD 3 L715 120 OHM L716 120 OHM L717 120 OHM L718 120 OHM L719 120 OHM C771 C772 C773 C774 C775 C776...
  • Page 48 +2.5V_DMQ +2.5V_DMC C301 C302 C303 C304 C305 C306 C307 C308 C309 C310 C311 C312 C313 C314 C315 C317 C318 C319 C320 C321 C322 C323 C324 C325 22uF/16V 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 22uF/16V 0.1uF...
  • Page 49 VCPU VCPU RP401 R464 C431 RP402 1/16W 1/16W 0.1uF 1/16W U402 C432 22pF X402 EA/VP P1.0 P1.1 P1.2 C433 24MHz P1.3 10uF/16V VCPU HDCP_SCL P1.4 HDCP_SDA DDC_WP 4 P1.5 U404 MAX810STR C434 22pF R440 P1.6 P1.7 D401 1/16W RESET Q403 P2.0 R411 POWER...
  • Page 50 VCC12V_AUDIO VCC12V_AUDIO C603 C601 C602 0.1uF 220uF/16V 220uF/16V U601 TDA7496L CN602 R601 18K 1/16W C604 0.47uF/16V C605 220uF/16V OUT_L OUTL R602 C606 0.47uF/16V C607 220uF/16V OUT_R OUTR 1/16W VOLUME AUDIO_SD STBY VAROUT_R PHONEJACK AUDIO_MU MUTE VAROUT_L R603 R604 C608 C609 C610 1/16W 1/16W...
  • Page 51 1/4W 200K 1/10W JP801 1/10W R844 LL4148 5.6K 1/10W R847 5.6K 1/10W D819 D820 D821 D822 JP802 LL4148 LL4148 LL4148 LL4148 ACER 22 C830 Title INPCC44AA1P 0.1uF/25V <Title> Size Document Number Custom <Doc> Date: Monday , February 12, 2007 Sheet...

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