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.