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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 Sep-29-2006 Initial Release TC6MMADKWGAGACP...
  • 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: Special Notes On Lcd Monitors

    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: Introduction

    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 M220Z1-L01 Panel...

  • Page 8: Electrical Requirements

    Electrical Requirements Standard Test Conditions All tests shall be performed under the following conditions, unless otherwise specified. Dark room Ambient light 40 cm for LCD performance, 20 cm for LCD failures Viewing distance Warm up time All specifications 30 minutes Fully functional 5 seconds Chroma 7120 signal generator or equivalent, directly...

  • Page 9: Lcd Monitor General Specification

    LCD Monitor General Specification...

  • Page 11: Lcd Panel Specification

    LCD Panel Specification LCD Panel Model (M220Z1-L01) General Specifications Mechanical Specification...
  • Page 12 Optical Specifications Test Conditions...

  • Page 13: Support Timing

    Supported Timing VESA MODES Horizontal Vertical Nominal Sync Nominal Sync Nominal Mode Resolution Total Frequency Polarit Freq. Polari Pixel Clock +/- 0.5kHz +/- 1 Hz (MHz) 640x480@60Hz 800 x 525 31.469 59.940 25.175 640x480@72Hz 832 x 520 37.861 72.809 31.500 640x480@75Hz 840 x 500 37.500...

  • Page 14: Monitor Block Diagram

    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.

  • Page 15: Main Board Diagram

    Main Board Diagram MAIN BOARD DIAGRAM VAA4 VCC3.3V VAA2 AT24C02 VCC1.8V VAA1 VAA3 (DDC)U301 DDCA SCL/SDA CLK1/DAT1 VGA R/G/B VGA Input PA 0~9 VGA Hsync/Vsync RXD/TXD PB 0~9 U402 U401 Panel HS/V PM25L010-25 TSUMU58WHJ Clk+/Clk- Signal R/G/B DDCD AT24C02 SDA/SCL (DDC)U302 AT24C16 CAT24WC08...

  • 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 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...

  • Page 19: Front Bezel

    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. •...

  • 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. • 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 Control Function...

  • 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 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...
  • Page 29 3. Remove the base stand. (Fig 3) 4.Remove the screws to release front bezel. (Fig 4) Fig 3 Fig 4...
  • Page 30 5 . Remove the hinge cap. (Fig 5) 6. Remove eleven screws to release top cover and bottom cover. (Fig 6) Fig 5 Fig 6...
  • Page 31 7. Remove the main board. (Fig 7) 8. Remove six clamps to release shield and the main board. (Fig 8) Fig 7 Fig 8...
  • Page 32 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...

  • Page 33: 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 Adapter/Inverter Measure U201 PIN2=2.5V...
  • Page 34 2. No Picture No picture The button if X601 oscillate Replace X601 under control waveform is normal Check reset circuit of Check Correspondent U601 is normal component Measure U201 PIN2=2.5V U202 PIN2=3.3V Replace U601 Replace U201, U202 X401 oscillate waveform is normal Replace X401 Check HS/VS from CN301 is normal...
  • Page 35 3. White Screen White screen Measure Q204 base X601 oscillate is low level? waveform is normal Replace X601 Check Q204 is broken or Check reset circuit of U601 CN503 solder? is normal Check Correspondent Check Correspondent component. component. Replace PANEL Replace U601 4.
  • Page 36 5. Inverter Board No Backlight...
  • Page 37 6. No Audio...

  • Page 38: Chapter 5 Connector Information

    Chapter 5 Connector Information The following figure shows the connector locations on the monitor: 15 – Pin Color Display Signal Cable (D-sub) Pin No. Description Pin No. Description Green Logic Ground Blue Monitor Ground Monitor Ground DDC-Serial Data DDC-Return H-Sync R-Ground V-Sync G-Ground...

  • Page 39: 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 40: Exploded Diagram

    Exploded Diagram (Model: AL2251W)
  • Page 41 Part List Above picture show the description of the following component. Item Picture Description Hinge Cover Bezel Back Cover Shield Main Frame...
  • Page 42 Panel Power Board Main Board Speakers...

  • Page 43: Schematic Diagram

    VLCD PB[0..9] PB[0..9] PB[0..9] VCC12V_AUDIO Volume Volume VCC3.3 VCC12V_AUDIO VCC1.8 VLCD 6.AUDIO 5.PANEL INTERFACE onBACKLITE VCTRL VCTRL onPanel_5V/3.3V VCC12V_AUDIO VCC3.3 VCC1.8 AdjBACKLITE adj_BACKLIGHT VLCD VLCD Title 2.POWER TSUMU58J FOR ACER Size Document Number 4.SCALER Date: Thursday, July 20, 2006 Sheet...
  • Page 44 R714 10K 1/10W Q704 AO3401 1/10W 1/10W 1/10W C725 C720 0.1uF R715 1uF/16V Q703 C721 R716 onPanel_5V/3.3V 10uF/16V PMBS3904 1/10W 4.7K 1/10W Q706 PMBS3906 Title C722 TSUMU58J FOR ACER 0.1uF Size Document Number POWER Date: Wednesday, August 09, 2006 Sheet...
  • Page 45 D322 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 VCC5V C319 C320 C321 C322 C323 C324 C325 C326 Title TSUMU58J FOR ACER 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF Size Document Number INPUT Date: Friday, July 21, 2006 Sheet...
  • Page 46 Scaler AVDD_33 VDDC AVDD_MEMPLL_33 VDDP VCC3.3 FB403 VDDP AVDD_18 VCC3.3 600 OHM C408 10uF/16V VCC3.3 C409 C410 C411 C412 C413 C419 C420 C430 C431 C432 C433 VCTRL VCTRL 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF RIN0P GNDR RIN0M LVA4P...

  • Page 47: Panel Interface

    LVBCKP LVBCKM LVB2P LVB2M VLCD LVB1P CONN LVB1M LVB0P LVB0M VLCD FB406 120 OHM C444 R442 0.1uF C445 2.2K 1/8W 22uF/16V 2006.05.03 add the schematic Title TSUMU58J FOR ACER Size Document Number PANEL INTERFACE Date: Thursday, July 20, 2006 Sheet...
  • Page 48 CN603 FB603 120 OHM OUT_R R608 1/10W FB601 120 OHM OUT_L R609 1/10W FB602 120 OHM FB604 120 OHM PHONEJACK CONN C614 C615 C616 C617 Title TSUMU58J FOR ACER Size Document Number <Doc> <RevCode> Date: Thursday, July 20, 2006 Sheet...
  • Page 49 1KΩ 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 Title C830 <Title> 0.1uF/25V INPCC42MA1P Size Document Number Custom <Doc> Date: Saturday, July 29, 2006 Sheet...

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