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Apple led cinema display 27inch User Manual

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    							LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 41 2010-11-18
    7.  Play a known-good sound and 
    verify sound quality is good. Yes
    Speakers and amplifier circuit 
    are OK.
    No Replace logic board. M09
    8.  (DisplayPort Audio) Disconnect 
    USB, and connect Mini 
    DisplayPort cable to a powered-
    up portable system supporting 
    Audio via DisplayPort, and 
    verify that  video is available on 
    display. Yes
    Go to step 9.
    No
    No Mini DisplayPort 
    connection. Go to Blank / No 
    Video, No Backlight.
    9.   (DisplayPort Audio) Launch 
    System Preferences: Sound: 
    Output and verify that Display’s 
    Audio Output is available and 
    selected. Yes
     Go to step 10.
    No Remove glass, LCD panel 
    screws, and lift LCD panel to 
    verify that function cable is 
    correctly seated between LCD 
    panel and logic board. Reseat 
    it and retest. Replace function 
    cable if damaged and retest. If 
    issue persists, go to step 10. X03
    10.  (DisplayPort Audio) Play a 
    known-good sound while 
    adjusting Balance control 
    and verify that sounds play 
    normally from left and right 
    speakers. Yes
    Audio through DisplayPort 
    appears to be functional. 
    Go to step 4 for further USB 
    Audio and speakers testing.
    No No or bad audio throught 
    DisplayPort, replace logic 
    board and retest.  
    If audio issue only persists 
    through the Mini DisplayPort 
    connection (but is OK when 
    using the USB connection), 
    replace LCD panel.  
    M09   
     
     
     
     
    L11
    Deep Dive: Audio Issues, Microphone
    Check ResultAction Code
    1.   Verify display’s USB connector 
    is plugged into known-good 
    powered-up supported system. Yes
    Go to step 2.
    No Connect display’s USB 
    connector to system.  
    Go to step 2.
    2.  Launch System Profiler and 
    verify that display’s USB hub, 
    Apple LED Cinema Display, 
    Display’s Audio and iSight are 
    visible in USB devices list. Yes
    USB hub circuit OK.  
    Go to step 3.
    No
    Go to USB Issues.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 42 2010-11-18
    3.  Determine if user-reported 
    issue is with display’s internal 
    speakers. YesGo to Audio Issues: General.
    No Go to step 4.
    4.  Launch System Preferences: 
    Sound: Input and verify that 
    Display’s Audio input (internal 
    Microphone) is selected. Yes
    Go to step 5.
    No Select display’s internal 
    Microphone and retest.
    5.   Launch System Preferences : 
    Sound: Input and verify that 
    Input Volume is set above 
    minimum. Yes
    Go to step 6.
    No Adjust Input Volume slider to 
    the middle position. Retest.
    6.  Launch System Preferences : 
    Sound: Input and verify that 
    Input Level indicator moves 
    when speaking into the 
    microphone. Yes
    Microphone working.  
    Go to step 7.
    No No input from display’s 
    microphone. Go to step 8.
    7.   Record sound sample using 
    GarageBand or QuickTime 
    Player (New Audio record in File 
    menu). Verify sound quality is 
    normal during playback on any 
    working audio outputs. Yes
    Microphone OK.
    No Replace microphone cable by 
    replacing rear housing. X03
    8.  Remove glass and LCD panel, 
    and verify if microphone cable 
    is correctly seated on logic 
    board. Yes
    Replace microphone cable by 
    replacing rear housing and 
    retest. If issue persists, replace 
    logic board.  X03 
     
    M09
    No Reseat microphone connector 
    on logic board and retest. 
    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. N99  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Mechanical Issues 43 2010-11-18
    Mechanical Issues
    Noise / Hum / Vibration
    Unlikely cause:  LCD panel, logic board, all-in-one cable, camera
    Quick Check
    SymptomsQuick Check
    Noise / Hum / Vibration
    •  Buzzing noise
    •  Rattling noise
    •  Ticking noise
    •  Squeaking noise
    1.  Verify display’s USB and Mini DisplayPort 
    connectors are plugged into known-good 
    supported system with up-to-date system 
    software.
    2.  Tilt display to hinge limits to determine if 
    mechanical noise is generated by the hinge 
    mechanism. Repair/replace mechanism if needed.
    3.   Play sound sample at loud and soft volume levels 
    to determine if noise is caused by the left/right/
    subwoofer speakers or the amplifier circuit.  
    See Audio Issues.
    4.  Verify that air intake/outflow vents are not 
    obstructed, inducing a high fan speed.
    Deep Dive
    Check ResultAction Code
    1.   Disconnect AC power cord, 
    remove glass and LCD panel, 
    disconnect left, right, and 
    subwoofer speaker cables from 
    logic board. Then reconnect 
    MagSafe, DisplayPort and 
    USB cables to a powered-on 
    computer. Verify if noise has 
    disappeared. Yes
    Audio issue with speakers or 
    amplifier. Go to Audio Issues.
    No Go to step 2.
    2.  Verify that ambient air temp 
    sensor is correctly positioned 
    on fan and securely connected 
    to logic board, and that 
    LCD temp sensor is securely 
    connected to its connector on 
    back of LCD panel, and properly 
    protected by insulating foam. Yes
    Go to step 4
    No Reseat sensors connectors /
    readjust sensor position/ 
    foam protection and retest.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Mechanical Issues 44 2010-11-18
    3.  Determine if noise issue sounds 
    like fan is running unusually 
    fast. Yes
    Replace ambient temp sensor 
    cable. X03
    No Go to step 4.
    4.  Remove fan and inspect blades 
    for damage or obstructions. Yes
    Replace fan. X23
    No Go to step 5.
    5.   Remove fan and rotate blades. 
    Verify that fan blades spin 
    smoothly without interference 
    from fan housing. Yes
    Go to step 6.
    No Replace fan. Retest. X23
    6.  Reinstall fan while carefully 
    ensuring that there are no 
    cables routed under or near 
    fan assembly that might cause 
    interference with the fan 
    blades.  After reassembling 
    verify that noise is resolved. Yes
    Noise issue resolved.
    No Replace fan. Reconnect all 
    cables, reinstall LCD panel and 
    retest. X23
    Burnt Smell / Odor
    Unlikely cause:  LCD panel, fan, camera, speakers, subwoofer, microphone
    Quick Check
    Symptoms
    Quick Check
    Burnt Smell/Odor
    •  No power
    •  No image
    •  No fan spin 1.
      Verify if source of smell/odor is emanating from 
    the LED Cinema Display (27-inch).
    2.  Verify display is functional.
    3.   Remove any air vent obstructions.
    Deep Dive
    Check ResultAction Code
    1.   Verify by visual inspection of 
    each module for the source of 
    burnt smell/odor.  Yes
    Located affected module.  
    Go to step 2.
    No
    Not able to locate affected 
    module. Go to  
    Dead Unit / No Power.
    2.  Verify no other modules or 
    internal cables damages 
    (pinched, shorting wires) as the 
    root cause. Yes
    Replace all affected module(s) 
    and/or cable(s). P08
    No Return unit to user.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Mechanical Issues 45 2010-11-18
    Fan Failures / Thermal Issues
    Quick Check
    SymptomsQuick Check
    Fan Failures / Thermal Issues
    •  Washed out image
    •  No, slow, fast fan spin
    •  Excessive heat exhaust
    •  Eventual shutdown of display 1.
      Remove air vent obstructions.
    2.  Verify display is functional.
    3.   Ensure the display on a stable work surface that 
    allows for adequate air circulation under and 
    around the unit.
    Deep Dive
    Check ResultAction Code
    1.   Verify ambient temp sensor is 
    correctly positioned on fan and 
    connected to logic board, that 
    LCD temp sensor is securely 
    connected to its connector on 
    back of LCD panel, and properly 
    protected by insulating foam. Yes
    Go to step 2.
    No Reseat sensors connectors 
    and/or readjust sensor 
    position and retest.
    2.  Verify pressure wall section 
    attached to fan is securely 
    seated to the rear housing. Yes
    Go to step 3.
    No Secure pressure wall and 
    check for presence of air 
    separation foam on back of 
    LCD panel. Retest.
    3.   Determine if fan is running 
    abnormally fast, slow, or 
    stopped. Yes
    Go to step 4.
    No Go to step 5.
    4.  Remove fan and rotate blades. 
    Verify that fan blades spin 
    smoothly without interference 
    with housing. Yes
    Go to step 5.
    No Replace fan. X22
    5.   Verify fan cable is securely 
    connected to logic board. Yes
    Go to step 6.
    No Reseat fan cable connector 
    and retest.
    6.  Disconnect any portable 
    computer connected via 
    MagSafe, unplug AC power 
    cord for a few minutes and 
    then replug to verify if fan 
    starts at full speed as soon as 
    AC is plugged. Yes
    Replace fan and retest.  
    If issue persists, replace logic 
    board. X22
    M18
    No Fan speed managed as 
    expected. Return unit to user.  
    						
    							LED Cinema Display (27-inch) Symptom Charts — Mechanical Issues 46 2010-11-18
    Mechanical Physical Damages
    Quick Check
    SymptomsQuick Check
    Mechanical Physical Damages
    •  Broken glass
    •  Bent stand
    •  Broken hinge
    •  Stripped screw/head/boss
    •  Dent or scratch to exterior
    •  Damaged cable/connector
    1.  Determine damage caused by user/technician 
    environment, accidental damage, or abuse.
    2.  Inform user/technician the damage is not 
    covered by Apple warranties. Refer to  
    http://www.apple.com/legal/warranty
    Deep Dive
    Check ResultAction Code
    1.   Determine whether fault has 
    already been isolated to a 
    single damaged part. Yes
    Go to step 2
    No Jump to appropriate 
    symptom code flow most 
    closely related to the user’s 
    reported symptom(s).
    2.  Determine whether damage 
    was caused by abuse. Yes
    Replace affected part. Abuse 
    is not covered by warranty. M24
    No Replace affected part. M24
    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. X99  
    						
    							© 2010 Apple Inc. All rights reserved.
     Apple Technician Guide 
    Take Apart
    LED Cinema Display (27-inch)   
    						
    							LED Cinema Display (27-inch) Take Apart — General Information 48 2010-11-18
    General Information
    Opening the Unit
    • The LED Cinema Display (27-inch) has a glass panel that attaches to the front, which must 
    be removed prior to replacing any module on the unit.
    •  Important: The glass panel should only be removed by Apple-authorized technicians.  
    Follow all cleaning and handling instructions to prevent damaging glass panel or LCD panel.
    •  Follow ESD precautions when glass panel is removed.
    For more information about ESD, refer to:  
    kBase #HT3451: Electrostatic Discharge Precautions and Myths 
    AppleCare Service Training: ESD Precautions
    Required Tools
    The following tools are required to service an LED Cinema Display (27-inch):
    •  ESD-safe workstation, including an ESD mat and wrist or heel strap
    •  ESD bags (for storing ESD-sensitive parts while removed from unit)
    •  Magnetized Torx T10 screwdriver
    •  Magnetized Phillips #0 screwdriver
    •  Black stick (nylon probe, Apple part #922-5065) or other non-conductive nylon or plastic 
    flat-blade tool
    •  Access card (Apple part #922-7172)
    •  Clutch mechanism retrieval tool (Apple part #922-7849)
    •  Thermal paste syringe (Apple part #922-9625) for camera
    •  Kapton tape
    •  Digital volt meter (for troubleshooting)
    •  Soft, clean towel or cloth (to protect display and removed parts from scratches)
    For more information about tools, refer to:  
    kBase #HT3452: Hand Tools for Desktop and Portable Repairs
    Required Special Tools for Glass Panel
    Special tools are required to remove, handle and clean glass panel.
    •  922-8252 – Suction cups, Pkg of 2
    •  922-8253 – Gloves, lint-free, anti-static, Pkg of 2
    •  922-8261 – Sticky silicone roller (6-inch) to clean glass panel
    •  922-8262 – Sticky sheet pads to clean silicone roller
    •  922-8263 – Polishing cloths, anti-static, optical-grade micro-terry, Pkg of 5
    •  922-9275 – Microfoam bag (large) to store glass panel, Pkg of 5  
    						
    							LED Cinema Display (27-inch) Take Apart — General Information 49 2010-11-18
    Cleaning Tools Starter Kit
    The following tools are offered in the cleaning starter kit (076-1277):
    • Suction cups, 1 pair
    •  Gloves, lint-free, anti-static, 2 pairs
    •  Sticky silicone roller (6-inch) to clean glass panel
    •  Sticky sheets to clean the silicone roller, 2 pads
    •  Polishing cloths, clean, anti-static, optical-grade micro-fiber “terry” style, 5 cloths
    •  Microfoam bag to store glass panel, 5 bags
    •  ESD bag for LCD panel storage, 5 bags
    Cleaning & Handling Glass Panel
    Follow cleaning procedures in this manual to ensure glass panel is free of dust and other 
    particles before returning the computer to customer.
    • The glass panel is not tempered and will break into sharp pieces of mishandled.   
    A scratched or broken glass panel is not covered under warranty.
    •  Removing glass panel requires special tools such as lint-free gloves, rubber suction cups, 
    microfoam storage bags, and iKlear cleaning solution.
    •  To prevent contamination, wear lint-free gloves and handle glass only by edges.
    Do’s and Don’ts
    DO
    • Handle glass panel using lint-free gloves.
    •  Use only a sticky silicone roller to clean the inside surface of glass and LCD panel.
    •  Use iKlear ONLY on the outside surface of glass panel.
    •  Place glass panel into a clean protective microfoam bag when removed from unit.
    •  Store glass panel in a safe area where it will not be broken or damaged.
    •  Store LCD panel in an anti-static bag to prevent buildup of static charges which may attract 
    dust particles to display’s surface.
    •  Store silicone roller and sticky paper within a temperature range of 39-104 F (5-40 C).
    •  If silicone roller is no longer tacky, wash it in warm soapy water or wipe with isopropyl 
    alcohol.  If tackiness does not return, replace silicone roller.
    DON’T
    •  Touch inside of glass with bare hands or dirty gloves.  Fingerprints are difficult to remove.
    •  Place glass panel onto a work surface where it may collect dust and other contaminants 
    unless it has first been placed into a protective microfoam bag.
    Handling a Broken Glass Panel
    The glass panel is not tempered and will break into sharp pieces if mishandled. If the glass is 
    broken it must be carefully removed from the unit to prevent irreparable damage to the front 
    surface of the LCD. If the front surface of the LCD is scratched by broken glass, the LCD may 
    need to be replaced.   
    						
    							LED Cinema Display (27-inch) Take Apart — General Information 50 2010-11-18
    How to Remove a Broken Glass Panel
    A shattered panel can be removed using safety glasses, packing tape, and leather gloves. 
    1.  Put on the safety glasses and leather gloves. 
    2.  Lay the computer on a smooth, clean work surface.
    3.   Peel protective covering off the front of the glass. Remove and discard any large pieces of 
    broken glass.  
    						
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