Apple led cinema display 24inch User Manual
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LED Cinema Display (24-inch) Symptom Charts — Display Issues 31 2010-11-25 Physical Damage SymptomQuick Check Physical Damage • C racked LCD • Scr atched LCD polarizer • Sc orched or melted LCD • L CD impact damage 1. Determine damage caused by user/technician environment, accidental damage, or abuse. 2. Inf orm user/technician the failures are not covered by Apple warranties. Refer to http://www.apple.com/legal/warranty Uncategorized Symptoms Check Result Action Code 1. V erify 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 (24-inch) Symptom Charts — Input/Output Issues 32 2010-11-25 Input/Output Issues USB Issues Unlikely cause: LCD panel, fan, subwoofer, speakers Quick Check SymptomsQuick Check USB Issues • Ex ternal USB device(s) not recognized • W ired USB keyboard/mouse not recognized 1. V erify display’s USB and Mini DisplayPort connectors are plugged into known-good supported system. 2. La unch System Profiler and confirm that display’s USB hub is visible. Deep Dive Check Result Action Code 1. V erify display’s USB and Mini DisplayPort connectors are plugged into known-good system. Yes Go to step 2. No Connect display’s USB and Mini DisplayPort cables. 2. 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 3. No Reseat connector and retest. 3. D isconnect USB cable from logic board and system. Inspect connectors and cable under magnification for pinched cables and damaged/bent pins. Yes Replace all-in-one cable. M15 No Replace logic board. X04 4. V erify USB device and cable function properly on a known good system. Yes Go to step 7 No Go to step 6. 5. Ins pect all three USB ports on display under magnification for damaged/bent pins. Yes USB ports damaged. Go to step 7. No Verify USB peripheral works on known-good display.
LED Cinema Display (24-inch) Symptom Charts — Input/Output Issues 33 2010-11-25 6. Verify that USB device is supported with the system and Mac OS X version being used. Yes Go to step 7. No Refer to device manufacturer for compatibility support. 7. V erify that USB device works with another known good display. Yes Replace logic board. M15 No Refer to device manufacturer for compatibility support. Camera Issues Unlikely cause: LCD panel, power supply, fan, subwoofer, speakers, microphone Quick Check Symptoms Quick Check Camera Issues • C amera not detected • N o green LED for camera • Ex cessive blooming • P oor white balance • P oor focus • Image dist ortion 1. Verify display’s USB and Mini DisplayPort connectors are plugged into known-good supported system. 2. V erify that all firmware updates have been applied. See kBase #HT3957: About the LED Cinema Display iSight Camera Firmware Update 1.0 3. La unch System Profiler and confirm that display’s USB hubs are visible. 4. V erify camera lens and glass panel are clear of contaminants. Deep Dive Check Result Action Code 1. La unch System Profiler and confirm 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. La unch System Profiler and confirm that iSight camera is recognized in display’s USB tree. Yes Go to step 3. No Reseat camera cable and retest. If problem persists, replace camera cable. L14 3. La unch PhotoBooth. Verify that green LED near camera lens turns on. Yes Go to step 4. No Replace camera. Retest. M13
LED Cinema Display (24-inch) Symptom Charts — Input/Output Issues 34 2010-11-25 4. Launch PhotoBooth. Verify that camera image appears normal. Yes Repair completed. No Clean camera lens. If needed, replace camera. Retest. M13 Audio Issues Unlikely cause: LCD panel, power supply, fan, camera Quick Check Symptoms Quick Check Audio Issues • In ternal speakers not recognized • N o sound • G arbled sound • N o bass • N o treble • M icrophone not working 1. V erify display’s USB and Mini DisplayPort connectors are plugged into known-good supported system. 2. La unch System Preferences and select Sound output options. Verify that display’s sound output option is set to display’s internal speakers. 3. V erify that “output volume” is set above minimum. (Suggest setting at midpoint.) 4. V erify that output volume ‘mute’ option is not checked. Deep Dive: Audio Issues, General Check Result Action Code 1. La unch System Profiler and confirm that display’s USB hub is visible. Yes USB hub circuit OK. Go to step 2. No Go to step 3. 2. D etermine if user-reported issue is with display’s internal microphone. Yes Go to Audio Issues: Microphone. No Go to step 3. 3. La unch System Preferences: Sound and select ‘sound output’ options. Verify output option is set to display’s internal speakers. Yes Go to step 6. No Set output to internal speakers. Retest. If needed, replace logic board. L11
LED Cinema Display (24-inch) Symptom Charts — Input/Output Issues 35 2010-11-25 4. Disconnect USB uplink cable from logic board and system. Inspect cable connectors and cable under magnification for pinched cables and damaged or bent pins. YesReplace all-in-one cable. L14 No Go to step 5. 5. D isconnect USB uplink cable from logic board. Inspect logic board USB connector under magnification for damaged or bent pins. Yes Replace logic board. Retest. M15 No Go to step 6. 6. La unch System Preferences and select Sound Effects options. Verify that sounds play normally from left and right speakers. Yes Speakers and amplifier circuit are OK. No Reseat left, right, and subwoofer speaker connections on logic board while inspecting cables for damage. Retest. If not resolved, go to step 7. 7. La unch System Preferences and select Sound output options. Verify sound quality normal when balance control set to ‘left only’ and ‘right only’ speakers. Yes Speakers and amplifier circuit are OK. No Based on results of test, replace left or right speaker or replace subwoofer. Retest. If not resolved, go to step 8. L11 8. La unch System Preferences and select Sound output options. Verify sound quality normal when balance control set to ‘left only’ and ‘right only’ speakers. Yes Speakers and amplifier circuit are OK. No Replace logic board. L11 Deep Dive: Audio Issues, Microphone Check Result Action Code 1. V erify display’s USB and Mini DisplayPort connectors are plugged into known-good supported system. Yes Go to step 2. No Connect display’s USB and Mini DisplayPort connectors to system. Go to step 2. 2. D etermine if user-reported issue is with display’s internal speakers. Yes Go to Audio Issues: General. No Go to step 3.
LED Cinema Display (24-inch) Symptom Charts — Input/Output Issues 36 2010-11-25 3. Launch System Preferences and select Sound input options. Verify that display’s internal microphone is selected. Yes Go to step 4. No Select display’s internal microphone. Retest. 4. La unch System Preferences and select Sound input options. Verify that ‘Input Volume’ is set above minimum. Yes Go to step 5. No Set ‘Input Volume’ slider to the middle position. Retest. 5. La unch System Preferences and select Sound input options. Verify that ‘Input Level’ indicator moves when speaking into the microphone. Yes Microphone working. Go to step 8. No Go to step 6. 6. La unch System Profiler and confirm that display’s USB hub is visible. Yes USB hub circuit OK. Go to step 7. No Go to USB Issues. 7. D isconnect USB uplink cable from logic board and all-in-one cable’s USB connector from system. Inspect connectors and cable under magnification for pinched cables and damaged/ bent pins. Yes Replace all-in-one cable. L14 No Replace logic board. Retest. M15 8. R ecord sound sample using GarageBand or iMovie HD. Verify sound quality is normal during playback. Yes Microphone OK. No Replace rear housing. M09 Uncategorized Symptoms Check Result Action Code 1. V erify 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 (24-inch) Symptom Charts — Mechanical Issues 37 2010-11-25 Mechanical Issues Noise, Hum or Vibration Unlikely cause: LCD panel, logic board, all-in-one cable, camera Quick Check SymptomsQuick Check Noise, Hum or Vibration • B uzzing noise • R attling noise • T icking noise • S queaking 1. Verify display’s USB and Mini DisplayPort connectors are plugged into known-good supported system. 2. T ilt display to hinge limits to determine if mechanical noise is generated by the hinge mechanism. Repair/replace mechanism if needed. 3. P lay sound sample at loud and soft volume levels to determine if noise is caused by the left/right/ subwoofer speakers or the amplifier circuit. Go to Audio Issues for additional information. 4. V erify that the air intake/outflow vents are not obstructed. Deep Dive Check Result Action Code 1. U nplug display and disconnect left, right, and subwoofer speaker cables from logic board. Power display ON and verify if noise disappears. Yes Audio issue with speakers or amplifier. Go to Audio Issues. No Go to step 2. 2. V erify ambient temp sensor cables (for both fan and LCD) are securely connected to logic board, and properly positioned on each part. Yes Go to step 4 No Reconnect and/or adjust ambient temp sensor cables and retest. 3. D etermine if noise issue sounds like fan is running abnormally fast. Yes Replace fan ambient temp sensor cable. P04 No Go to step 4. 4. R emove fan and inspect blades for damage or obstructions. Yes Replace fan. P04 No Go to step 5.
LED Cinema Display (24-inch) Symptom Charts — Mechanical Issues 38 2010-11-25 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. P04 6. R einstall 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. Retest. P04 Fan Failures / Thermal Issues Quick Check Symptoms Quick Check Fan Failures / Thermal Issues • W ashed out image • N o, slow, fast fan spin • Ex cessive heat exhaust • E ventual shutdown of display 1. R emove air vent obstructions. 2. V erify display is functional. 3. E nsure the display on a stable work surface that allows for adequate air circulation under and around the unit. Deep Dive Check Result Action Code 1. V erify ambient temp sensor cables (for both fan and LCD) are securely connected to logic board, and properly positioned on each part. Yes Go to step 2. No Reconnect and/or adjust ambient temp sensor cables and retest. 2. V erify thermal wall section attached to fan is securely seated in the rear housing. Yes Go to step 3. No Secure thermal wall and retest. 3. D etermine if fan is running abnormally fast, slow, or stopped. Yes Go to step 4. No Go to step 5. 4. R emove fan and rotate blades. Verify that fan blades spin smoothly without interference from fan housing. Yes Go to step 5. No Replace fan. M18
LED Cinema Display (24-inch) Symptom Charts — Mechanical Issues 39 2010-11-25 5. Verify fan cable is securely connected to logic board. Yes Go to step 6. No Secure fan cable and retest. 6. D etermine if there is a module that is excessively over temperature Yes Replace affected module and retest. No Return unit to user. Mechanical Physical Damages Quick Check Symptoms Quick Check Mechanical Physical Damages • B roken glass • B ent stand • B roken hinge • S tripped screw/head/boss • D ent or scratch to chassis • D amaged cable/connector 1. Determine damage caused by user/technician environment, accidental damage, or abuse. 2. Inf orm user/technician the damage is not covered by Apple warranties. Refer to http://www.apple.com/legal/warranty Deep Dive Check Result Action Code 1. D etermine 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. D etermine whether damage was caused by abuse. Yes Replace affected part. Abuse is not covered by warranty. M24 No Replace affected part. M24
LED Cinema Display (24-inch) Symptom Charts — Mechanical Issues 40 2010-11-25 Uncategorized Symptoms CheckResult Action Code 1. V erify 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