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Apple led cinema display 27inch User Manual

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    							LED Cinema Display (27-inch) Symptom Charts — Display Issues 31 2010-11-18
    2. Verify if issue is bright or dark 
    dot pixel anomalies. YesGo to pixel anomalies.
    No Go to step 3.
    3.   Verify if issue is non-uniform 
    brightness. Yes
    Go to non-uniform brightness.
    No Go to step 4.
    4.  Verify if issue is incorrect/
    missing colors.  Yes
    Go to incorrect/missing colors.
    No Go to step 5.
    5.   Verify if issue is distorted/
    blurred image.  Yes
    Go to distorted/blurred image.
    No Go to step 6.
    6.  Verify if issue is vertical or 
    horizontal lines. Yes
    Go to vertical/horizontal lines.
    No Go to step 7.
    7.   Verify if issue is overall 
    display appearing washed or 
    tinted. Yes
    Go to washed or predominant 
    color tint.
    No LCD functioning OK.
    Deep Dive: Pixel Anomalies
    Unlikely cause: logic board, power supply, fan, camera, speakers, subwoofer, microphone
    Check ResultAction Code
    1.   Determine if “defects” are dust/
    debris on surface of glass panel 
    or LCD panel.  Yes
    Clean glass/LCD panel.  
    Note: If debris is inside LCD, it 
    can’t be cleaned, therefore 
    replace LCD panel.  
     
    L08
    No Go to step 2.
    2. Determine if bright pixel 
    defects exceed acceptable 
    number. See kBase #HT1721: 
    About LCD display pixel 
    anomalies Yes
    Replace LCD panel. L08
    No LCD meets bright pixel defect 
    specifications. Go to step 3.
    3.  Determine if dark pixel defects 
    exceed acceptablenumber. See 
    kBase #HT1721: About LCD 
    display pixel anomalies Yes
    Replace LCD panel. L08
    No LCD meets dark pixel defect 
    specifications. Go to step 3.
    4. Determine if combination of 
    bright/dark pixel defects 
    exceed acceptablenumber. See 
    kBase #HT1721: About LCD 
    display pixel anomalies Yes
    Replace LCD panel. L08
    No Explain to user that LCD is 
    within specifications for pixel 
    defects. Do not replace LCD.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Display Issues 32 2010-11-18
    Deep Dive: Non-Uniform Brightness
    Unlikely cause: logic board, power supply, fan, camera, speakers, subwoofer, microphone
    CheckResultAction Code
    1.   Determine if brightness 
    uniformity issue is visible after 
    display has warmed up for a 
    few minutes. Yes
    Go to step 2.
    No Display backlight can take a 
    few minutes to stabilize. 
    2.  Display user-provided 
    examples showing brightness 
    uniformity issue. Determine if 
    issue appears excessive when 
    compared to a similar unit. Yes
    Go to step 3.
    No Explain to user that 
    LCD appears to meet 
    specifications.
    3.   Remove front bezel and 
    loosen screws securing LCD. 
    Determine if brightness 
    uniformity improves. Yes
    Inspect for mechanical 
    interference with screws/
    chassis/wires making contact 
    with back of LCD. Retest
    No Replace LCD panel. L07
    Deep Dive: Incorrect/Missing Colors
    Unlikely cause: power supply, fan, camera, speakers, subwoofer, microphone
    Check ResultAction Code
    1.   Verify display’s USB hub and 
    built-in camera are listed in the 
    System Profiler’s USB device 
    tree. Yes
    Power supply and USB 
    communication OK.  
    Go to step 2.
    No
    Go to USB Issues.
    2.  Verify System Preferences: 
    Displays: Color is using a valid 
    display profile for this display. Yes
    If display profile is valid and 
    the colors are still incorrect or 
    missing, go to step 3.
    No Calibrate display by creating a 
    manual profile using calibrate 
    feature in System Preferences: 
    Displays: Color and retest.
    3.   Verify that the glass panel and 
    LCD are free of contaminants. 
    Also verify that LCD glass is 
    flush with rear housing. Yes
    Go to step 4.
    No Clean glass/LCD panel and 
    retest. Make sure that glass 
    is correctly reinstalled onto 
    enclosure to prevent any air /
    dust passage.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Display Issues 33 2010-11-18
    4. Remove glass and LCD panel 
    screws, lift LCD panel and verify 
    that all connections between, 
    all-in-one cable, LCD, and 
    logic board are secure. See 
    Functional Overview .Yes
    Go to step 5.
    No Reseat connections, replace 
    damaged cable(s) as needed. 
    Retest.
    5.   Set desktop pattern in System 
    Preferences to “solid gray light.” 
    Verify if incorrect/missing color 
    issue affects entire display. Yes
    Suspect poor video 
    connection.  
    Replace all-in-one cable. L14
    No Go to step 6.
    6.  Set up user’s display side-by-
    side with a known-good display 
    showing the same image. Verify 
    if issue is noticeably worse on 
    the display being tested.  Yes
    Replace LCD panel. L02
    No Small variations in color 
    uniformity are normal and do 
    not warrant replacement or 
    repair of the display.
    Deep Dive: Distorted/Blurred Image
    Unlikely cause: power supply, fan, camera, speakers, subwoofer, microphone
    Check ResultAction Code
    1.   Verify display’s Mini DisplayPort 
    connector is plugged into 
    known-good system. Yes
    Go to step 2.
    No Connect Mini DisplayPort 
    cable to known-good system.
    2.  Reseat Mini DisplayPort cable 
    at attached computer and 
    reseat internal all-in-one cable’s 
    DisplayPort connector to LCD 
    panel. Determine if image 
    corruption issue was resolved. Yes
    Loose cable. Issue resolved.
    No Go to step 3.
    3.   Disconnect Mini DisplayPort 
    cable from system and display 
    logic board. Inspect connectors 
    and cable under magnification 
    for pinched cables and 
    damaged/bent pins.  Yes
    Replace all-in-one cable. X03
    No Replace LCD panel. L04  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Display Issues 34 2010-11-18
    Deep Dive: Vertical/Horizontal Lines
    Unlikely cause: logic board, power supply, fan, camera, speakers, subwoofer, microphone
    CheckResultAction Code
    1.   Verify display’s USB hub and 
    built-in camera are listed in the 
    System Profiler’s USB device 
    tree. Yes
    Power supply and USB 
    communication appear OK.  
    Go to step 3.
    No Go to step 2.
    2.  Unplug and replug the Mini 
    DisplayPort connector into 
    a supported powered-up 
    portable system and monitor 
    the portable’s display. Verify 
    that the portable’s display 
    briefly turns off then back on. Yes
    LCD panel DisplayPort 
    connection detected by 
    system. Go to step 3.
    No Replace all-in-one cable.  
    If issue persists, go to step 3. X03
    3.   Verify all-in-one cable, and all 
    connections between logic 
    board and LCD are secure. 
    Visually inspect cables and 
    connectors for any debris, 
    damage, or bent pins. Yes
    If connections are secure 
    and the display still does not 
    function correctly, replace 
    LCD panel.  
     
    L05
    No
    Connector/cable damage.  
    Go to Mechanical Physical 
    Damages.
    Deep Dive: Washed or Predominant Color Tint
    Unlikely cause: logic board, power supply, fan, camera, speakers, subwoofer, microphone
    Check ResultAction Code
    1.   In System Preferences: Displays 
    set brightness slider setting to 
    maximum, and verify that issue 
    is fixed. Yes
    Issue caused by low 
    brightness adjustment for 
    current room light.
    No Go to step 2.
    2.  In System Preferences: Displays 
    uncheck the “Automatically 
    adjust brightness as ambient 
    light changes “ checkbox, and 
    verify that issue is fixed. Yes
    Go to Unstable Brightness 
    / Brightness Progressively 
    Getting Low
    No Go to step 3.
    3.   In System Preferences: Displays: 
    Color select the LED Cinema 
    Display profile and verify that 
    issue is fixed. Yes
    Issue was caused by use 
    of incorrect display profile. 
    Delete incorrect profile and 
    recreate a new one if needed.
    No Replace LCD panel. L05  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Display Issues 35 2010-11-18
    Physical Damage
    Quick Check
    SymptomQuick Check
    Physical Damage
    •  Cracked LCD
    •  Scratched LCD polarizer
    •  Scorched or melted LCD
    •  Impact damage to LCD, glass or 
    rear housing
    1.  Determine damage caused by user/technician 
    environment, accidental damage, or abuse.
    2.  Inform user/technician the failures are not 
    covered by Apple warranties. Refer to  
    http://www.apple.com/legal/warranty
    Uncategorized Symptoms
    Deep Dive
    Check ResultAction Code
    1.   Verify whether existing 
    symptom code applies to the 
    issue reported by the user. Yes
    Jump to appropriate 
    symptom code flow.
    No
    Document reported failure 
    and send feedback to 
    [email protected] 
    stating that a suitable 
    symptom code wasn’t found. L99  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 36 2010-11-18
    Input/Output Issues
    USB Issues
    Unlikely cause:  LCD panel, fan, camera, speakers, subwoofer, microphone
    Quick Check
    SymptomsQuick Check
    USB Issues
    •  External USB device(s) not 
    recognized
    •  Wired USB keyboard/mouse 
    not recognized
    •  No audio output through 
    display speakers (when using 
    USB audio) 1.
      Check USB device on a known-good system.
    1.   Verify display’s USB and Mini DisplayPort 
    connectors are plugged into known-good 
    powered-up supported system with up-to-date 
    system software.
    2.  Run Software Update to check for any available 
    software or firmware update for the connected 
    display. Connect known-good USB input device.
    3.   Launch System Profiler and confirm that display’s 
    USB hub, Apple LED Cinema Display, Display’s 
    Audio and iSight are visible in USB devices list.
    4.  Launch System Preferences: Sound: Output and 
    check that the display’s speakers output can be 
    selected and that sound can be played through 
    them.
    Deep Dive
    Check ResultAction Code
    1.   Connect AC power cord to 
    display then connect MagSafe 
    to a known-good portable 
    system and verify that the 
    MagSafe connector LED is 
    either green or orange/amber. Yes
    Go to step 2.
    No
    Display does not seem to be 
    powered. Go to Dead Unit/ 
    No Power.
    2.  Connect display’s USB 
    connectors into known-good 
    powered-up portable system, 
    launch System Profiler and 
    verify that display’s USB hub, 
    Apple LED Cinema Display, 
    Display’s Audio and iSight are 
    visible in the USB devices list.  Yes
    Go to step 5.
    No Need to check internal USB 
    uplink cable connection.  
    Go to step 3.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 37 2010-11-18
    3.  Remove glass and LCD panel 
    and verify USB uplink cable 
    connection to logic board 
    is secure. See Functional 
    Overview. Yes
    If connections are secure and 
    USB ports still do not function 
    correctly, go to step 4.
    No Reseat connector and retest.
    4.  Disconnect USB cable from 
    logic board and from attached 
    computer. Inspect connectors 
    and cable under magnification 
    for pinched cables and 
    damaged/bent pins.  Yes
    Replace all-in-one cable. X03
    No Go to step 5
    5.   Inspect all three USB ports on 
    display under magnification for 
    damaged/bent pins. Yes
    USB ports damaged.  
    Go to step 7.
    No Need to check that USB 
    peripheral works on known-
    good display. Go to step 6.
    6.  Verify that USB device works 
    with another known-good 
    display Yes
    Device OK with other display. 
    Go to step 7.
    No Refer to device manufacturer 
    for compatibility support.
    7.   Verify that USB device only fails 
    on this display USB ports. Yes
    Replace logic board. M15
    No Refer to device manufacturer 
    for compatibility support.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 38 2010-11-18
    Camera Issues
    Unlikely cause:  LCD panel, power supply, fan, speakers, subwoofer, microphone
    Quick Check
    SymptomsQuick Check
    Camera Issues
    •  Camera not detected
    •  No green LED for camera
    •  Excessive blooming
    •  Poor white balance
    •  Poor focus
    •  Image distortion 1.
      Verify display’s USB and Mini DisplayPort 
    connectors are plugged into known-good 
    powered-up supported system with up-to-date 
    system software.
    2.  Run Software Update to check for any available 
    software or firmware update for the display. 
    3.   Launch System Profiler and confirm that display’s 
    USB hub, Apple LED Cinema Display, Display’s 
    Audio and iSight are visible in USB devices list.
    4.  Verify camera lens and glass panel are clear of 
    contaminants.
    Deep Dive
    Check ResultAction Code
    1.   Connect display’s USB 
    connectors into known-good 
    powered-up portable system, 
    launch System Profiler and 
    verify that the display’s USB 
    hub is visible in the USB tree. Yes
    USB hub recognized.  
    Go to step 2.
    No
    Go to USB Issues.
    2.  Verify in System Profiler that 
    iSight camera is recognized in 
    display’s USB tree. Yes
    Go to step 3.
    No Remove glass and LCD panel, 
    reseat camera cable and 
    retest. If problem persists,  
    replace camera cable. X03
    3.   Launch Photo Booth. Verify that 
    green LED near camera lens 
    turns on. Yes
    Go to step 4.
    No Replace camera, run EEPROM 
    Reset Tool (see camera take-
    apart section for details) and 
    retest. M13
    4.  Launch Photo Booth. Verify that 
    camera image appears normal. Yes
    Repair completed.
    No Clean camera lens. If needed, 
    replace camera, run EEPROM 
    Reset Tool, and retest. M13  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 39 2010-11-18
    Audio Issues
    Unlikely cause: power supply, fan, camera
    Quick Check
    SymptomsQuick Check
    Audio Issues
    •  Internal speakers not 
    recognized (through USB 
    audio or Mini DisplayPort 
    connections)
    •  No sound
    •  Garbled sound
    •  No bass
    •  No treble
    •  Sound seems to come from 
    only one side
    •  Microphone not working
    1.  Conect display to a known-good supported 
    powered-up system with up-to-date system 
    software. 
    2.  For audio through Mini DisplayPort, check that 
    system model supplies an audio signal through 
    Mini DisplayPort (see kBase #TS3065: Mac 
    computers: HDMI audio doesn’t work with 
    some adapters for list of system models)
    3.   Run Software Update to check for any available 
    software or firmware update for the display. 
    4.  Launch System Profiler and confirm that display’s 
    USB hub, Apple LED Cinema Display, Display’s 
    Audio and iSight are visible in USB devices list.
    5.   Launch System Preferences: Sound: Output and 
    verify that Display’s audio output is selected.
    6.  Verify that Output volume ‘mute’ option is 
    not checked, and Output volume is set above 
    minimum (suggest setting at midpoint).
    7.   Verify that System Preferences: Sound: Input is set 
    to Display’s Audio, and adjust Input Volume slider 
    according to room noise.
    Deep Dive: Audio Issues, General
    Check ResultAction Code
    1.   Connect display AC power cord 
    and connect MagSafe, USB 
    and Mini DisplayPort cables 
    into known-good supported 
    powered-up system with up-to-
    date system software. Launch 
    System Profiler and confirm 
    that display’s USB hub is visible. Yes
    USB hub circuit OK.  
    Go to step 2.
    No
    Go to USB Issues.
    2.  Determine if user-reported 
    issue is with display’s internal 
    microphone. Yes
    Go to Audio Issues: 
    Microphone.
    No Issue only with speakers.  
    Go to step 3.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 40 2010-11-18
    3.  Verify that issue only happens 
    when playing audio through 
    the DisplayPort audio. YesVerify that system model 
    supplies an audio signal 
    through Mini DisplayPort 
    (see kBase #TS3065: Mac 
    computers: HDMI audio 
    doesn’t work with some 
    adapters for list of models 
    which support it):
     
    -If the system supports 
    audio through DisplayPort, 
    go to step 8 for specific 
    troubleshooting.  
    -If computer does not support 
    audio through DisplayPort, 
    make sure that USB is 
    connected to system. If you 
    need to troubleshoot a USB 
    Audio issue, go to step 4.
    No Issue happens with USB 
    audio. Go to step 4.
    4.  (USB Audio) Make sure that 
    USB is connected to supported 
    powered-up portable system. 
    Launch System Preferences: 
    Sound: Output. Verify Output 
    option is set to Display’s Audio 
    speakers. Yes
    Go to step 5.
    No Set Output to Display Audio 
    speakers and retest.
    5.   Launch System Preferences 
    and select Sound options. Play 
    a known-good sound while 
    adjusting Balance control 
    and verify that sounds play 
    normally from both left and 
    right speakers. Yes
    Speakers and amplifier circuit 
    appear OK. Go to step 6.
    No Reseat left, right, and 
    subwoofer speaker cable 
    connections on logic board 
    while inspecting cables 
    for damage. If any cable is 
    damaged, replace affected 
    left, right or subwoofer 
    speaker and retest. If audio 
    issue is not resolved, go to 
    step 5. X03
    6.  Play a known-good sound and 
    verify sound quality is good on 
    each side when Balance control 
    is set to ‘left only’ and ‘right 
    only’ speakers.  Yes
    Speakers and amplifier circuit 
    appear OK. Go to step 7.
    No Based on results of test, 
    replace left or right speaker or 
    replace subwoofer. Retest. If 
    not resolved, go to step 7.  
    X03  
    						
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