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Acer Travelmate 4020 Service Guide

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    							Chapter 355
    Disassembling the Main Unit
    Separate the Main Unit Into the Upper and the Lower Case Assembly
    1.Remove the two screws holding the switch board.
    2.Remove the switch board.
    3.Disconnect the touchpad FFC from the main board.
    4.Disconnect the bluetooth cable.
    5.Remove the five screws that secure the upper case.
    6.Remove the eighteen screws on the bottom as shown.
    7.Detach the upper case assembly and place it next to the lower case assembly.
    8.Disconnect the microphone cable then remove the upper case assembly. 
    						
    							56Chapter 3
    Disassembling the Upper Case Assembly
    1.Disconnect the touchpad board to touchpad FFC.
    2.Disconnect the touchpad board to main board FFC.
    3.Then detach the touchpad board to main board FFC from the touchpad board.
    4.Remove the three screws that secure the touchpad board.
    5.Remove the touchpad board from the upper case.
    6.Disconnect the touchpad board to touchpad FFC.
    7.Remove the touchpad board to touchpad FFC from the uppwer case assembly.
    8.Remove the four screws holding the touchpad bracket.
    9.Detach the touchpad bracket from the upper case assembly.
    10.Remove the touchpad from the upper case.
    11 .Remove the two screws that secure the bluetooth module.
    12.Disconnect the bluetooth module then remove it. 
    						
    							Chapter 357
    Disassembling the Lower Case Assembly
    1.Disconnect the MDC cable from the modem board.
    2.Detach the MDC cable from the main board.
    3.Remove the two screws holding the modem board.
    4.Remove the modem board from the lower case.
    5.Disconnect the speaker cable from the main board.
    6.Remove the two screws that secure the main board.
    7.Remove the two screw nuts as shown.
    8.The you can detach the main board from the upper case. 
    9.Remove the three screws that secure the VGA heatsink.
    10.Remove the VGA heatsink from the main board as shown.
    11 .Remove the three in one cover from the lower case.
    12.Remove the two screws that secure the speaker set on one side. 
    						
    							58Chapter 3
    13.Then remove another two screws holding the speaker set on the other side.
    14.Then take out the speaker set from the lower case. 
    						
    							Chapter 359
    Disassembling the LCD Module
    1.Remove the four screw caps as shown.
    2.Remove the four screws holding the LCD bezel.
    3.Then detach the LCD bezel from the LCD module.
    4.Disconnect the inverter board then remove it.
    5.Remove the three screws holding the right hinge.
    6.Then remove the three screws that secure the left hinge.
    7.Remove one screw that secure the LCD bracket.
    8.Remove another screw holding the LCD bracket on the other side. 
    9.Then detach the LCD panel from the LCD cover carefully.
    .
    10.Remove the two screws holding the right bracket.
    11 .Then remove the right bracket.
    12.Remove another two screws that tighten the left bracket.  
    						
    							60Chapter 3
    13.Remove the left bracket as the picture shows.
    14.Tear off the tape fastening the LCD cable.
    15.Tear off the the LCD cable fastening the LCD cable, then remove it.. 
    						
    							Chapter 361
    Disassembling the External Modules
    Disassembling the HDD Module
    1.Remove the two screws holding the HDD bracket on one side.
    2.Remove another two screws holding the HDD bracket on the other side.
    3.Then take the hard disc drive out from the HDD bracket.
    Disassembling the Optical Drive Module
    1.Remove the four screws as the picture shows.
    2.Remove the two screws that secure the optical disc drive and the ODD holder.
    3.Push the ODD holder as shown.
    4.Detach the ODD holder.
    5.Disconnect the ODD connector board then remove it. 
    						
    							Chapter 463
    Use the following procedure as a guide for computer problems.
    NOTE: The diagnostic tests are intended to test only Acer products. Non-Acer products, prototype cards, or 
    modified options can give false errors and invalid system responses.
    1.Obtain the failing symptoms in as much detail as possible.
    2.Verify the symptoms by attempting to re-create the failure by running the diagnostic test or by repeating 
    the same operation.
    Troubleshooting
    Chapter 4 
    						
    							64Chapter 4
    System Check Procedures
    External Diskette Drive Check
    Do the following to isolate the problem to a controller, driver, or diskette. A write-enabled, diagnostic diskette is 
    required.
    NOTE: Make sure that the diskette does not have more than one label attached to it. Multiple labels can cause 
    damage to the drive or cause the drive to fail. 
    Do the following to select the test device.
    1.Boot from the diagnostics diskette and start the diagnostics program.
    2.See if FDD Test is passed as the program runs to FDD Test.
    3.Follow the instructions in the message window.
    If an error occurs with the internal diskette drive, reconnect the diskette connector on the system board.
    If the error still remains:
    1.Reconnect the external diskette drive/DVD-ROM module.
    2.Replace the external diskette drive/CD-ROM module.
    3.Replace the main board.
    External CD-ROM Drive Check
    Do the following to isolate the problem to a controller, drive, or CD-ROM. Make sure that the CD-ROM does 
    not have any label attached to it. The label can cause damage to the drive or can cause the drive to fail.
    Do the following to select the test device:
    1.Boot from the diagnostics diskette and start the diagnostics program.
    2.See if CD-ROM Test is passed when the program runs to CD-ROM Test.
    3.Follow the instructions in the message window.
    If an error occurs, reconnect the connector on the System board. If the error still remains:
    1.Reconnect the external diskette drive/CD-ROM module.
    2.Replace the external diskette drive/CD-ROM module.
    3.Replace the main board.
    Keyboard or Auxiliary Input Device Check
    Remove the external keyboard if the internal keyboard is to be tested.
    If the internal keyboard does not work or an unexpected character appears, make sure that the flexible cable 
    extending from the keyboard is correctly seated in the connector on the system board.
    If the keyboard cable connection is correct, run the Keyboard Test. 
    If the tests detect a keyboard problem, do the following one at a time to correct the problem. Do not replace a 
    non-defective FRU:
    1.Reconnect the keyboard cables.
    2.Replace the keyboard.
    3.Replace the main board.
    The following auxiliary input devices are supported by this computer:
    TNumeric keypad
    TExternal keyboard
    If any of these devices do not work, reconnect the cable connector and repeat the failing operation.  
    						
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