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