Apple imac 21 5 inch late 2009 User Manual
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iMac (21.5-inch, Late 2009) Symptom Charts — Startup and Power 41 2010-11-18 Burnt Smell/Odor Unlikely cause: speakers, microphone, rear housing Quick Check SymptomsQuick Check Burnt Smell/Odor • Burning smell • Unusual odor 1. Verify that computer is the source of the odor. 2. If system is new, see kBase #TA22044: New Equipment: Odors May Be Present Short-Term. 3. Disconnect all third-party devices and check to see if any external device is the source of odor. 4. Inspect air intake and air outlets for obstructions. To prevent overheating make sure there is sufficient clearance to allow air to flow unobstructed into and out of the system. 5. Verify if system is functional. Deep Dive Check ResultAction Code 1. Verify if source of the odor can be identified by visually inspecting each module and its associated cables for signs of burned or damaged components, smoke residue, burned traces, or melted or damaged wiring, Yes Replace affected module(s). Go to step 2 P08 No Unable to locate source of odor. Go to step 3. 2. Disconnect all third-party devices and cables. Power ON system and verify if smoke or strong odor returns. Yes Power down system immediately. Go to step 3. No System functions correctly. Verify system functionality with third-party devices and cables and return system to user if problem has been resolved. Consult third-party companies as needed for issues with those products.
iMac (21.5-inch, Late 2009) Symptom Charts — Startup and Power 42 2010-11-18 3. Verify if source of odor can be located using your nose. Yes Replace affected module(s) and retest system. P08 No Contact Apple for assistance if you feel that there is a possible safety issue with computer that has not been resolved in previous steps. Uncategorized Symptoms Quick Check Symptoms Quick Check Uncategorized Symptoms • Unable to locate appropriate symptom code. 1. Make sure system is plugged into a known-good outlet. 2. Listen for boot chime, fan, optical drive, or hard drive noise which indicates system is powering up. If noise is heard, go to Won’t Start Up symptom flow. If no noise is heard go to No Power, Dead Unit symptom flow. 3. Attempt to boot from Install DVD to isolate possible software issues. Deep Dive Check ResultAction Code 1. Verify if existing symptom code applies to issue reported by 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. Provide as much detail as possible. N99
iMac (21.5-inch, Late 2009) Symptom Charts — Display 43 2010-11-18 Display Backlight Issue/No Backlight Unlikely cause: hard drive, optical drive, speakers, camera, microphone Quick Check SymptomsQuick Check Backlight Issue/No Backlight • No image • Partial backlight failure • Backlight flickers • Display dim 1. Check for Software Update. 2. Verify that System Preferences > Displays > Brightness control setting is above minimum. 3. If no image on built-in display, connect external display to verify if iMac video circuitry is functioning. If no image visible on external display, go to No Video symptom flow. Deep Dive Check ResultAction Code 1. Verify boot chime present and fans running when computer powered ON. (Reset SMC and clear PRAM if necessary for proper boot up.) Yes Power on self test OK. Go to step 2. No Go to Won’t Start Up symptom flow. 2. Verify if image is visible on built-in LCD panel, with adjustable backlight level. Yes Video present. Verify system functionality and return to user or go to appropriate troubleshooting flow. No Go to step 3. 3. Connect supported external display. Verify if image appears on external display when system is booted. Yes External display detected by system. Video circuitry on logic board functional. Go to step 4. No Go to No Video symptom flow. 4. Verify if LCD backlight is ON by looking for faint glow from display when viewed in darkened room with brightness set at maximum. Yes LED backlight is functioning. Go to step 7. No Go to step 5.
iMac (21.5-inch, Late 2009) Symptom Charts — Display 44 2010-11-18 5. Shine bright (low heat) flashlight onto front of LCD. With computer powered ON verify if a faint image is visible. Yes LCD panel functional but backlight is missing or dim. Remove LCD panel and inspect and reseat the following cable connections: -Output cable between lower end of LED backlight board and lower end of LCD panel. -Vertical sync cable between upper end of LED backlight board and LCD panel. -DC power cable between upper right of LED backlight board and power supply. Replace any damaged cable. Reinstall LCD panel and go to step 6. X03 No No image or backlight. Go to step 7. 6. Power ON system. Verify if image is now visible on LCD panel with correct backlight level. Yes Issue resolved. No Replace LED backlight board. Retest. If issue persists, go to step 7. M04 7. Inspect and reseat LVDS cable between LCD panel and logic board. Power ON system. Verify if image is visible on built-in LCD display. Yes Issue resolved. No Replace LVDS cable. If issue persists, replace LCD panel. Retest. X03 L03
iMac (21.5-inch, Late 2009) Symptom Charts — Display 45 2010-11-18 Noise / Unstable Flickering Unlikely cause: camera, microphone Quick Check SymptomsQuick Check Noise / Unstable Flickering • Unstable image • Flickering image • Humming noise from display • High frequency noise from display 1. Verify that intake vent on bottom of computer is not obstructed. 2. Inspect system for third party software that is being used to set fan speeds to a higher than normal RPM. Some users may install this software to monitor and control internal temperatures, potentially causing higher fan speeds to generate higher than expected noise levels. Deep Dive Check ResultAction Code 1. Verify if user issue is due to flickering, or to an unstable video image on the LCD. Yes Suspected flickering issue, go to step 2 No For audible noise issues go to step 8. All other issues go to appropriate symptom flow. 2. Connect a supported external display to the mini DisplayPort on rear of computer. Verify if issue occurs with external display. Yes Suspect issue with video circuitry. Go to Corrupted Video symptom flow. No Video circuitry OK. Go to step 3. 3. Disconnect and carefully inspect all four cables on back of LCD panel for signs of damage, corrosion, or pinched wires. Yes Replace damaged cable(s) where needed, otherwise reattach connectors. Retest. X03 No Go to step 4. 4. Power ON computer and verify if issue still occurs. Yes If connections are secure and display is still flickering, go to step 5. No Issue resolved.
iMac (21.5-inch, Late 2009) Symptom Charts — Display 46 2010-11-18 5. Shine bright (low heat) flashlight into front of LCD. Verify if an image is being displayed when flickering issue is occurring. Yes Image present but backlight is flickering. Replace vertical sync cable (between LCD panel and upper end of LED backlight board) and retest. If issue persists, replace LED backlight board. X03 M04 No Replace LVDS cable between LCD panel and logic board, and retest. X03 6. Verify if noise varies when adjusting brightness level up and down. Yes Noise seems to be generated by vertical sync cable. Inspect and replace. No Noise is from another source. Go to step 7. 7. Verify if noise can be heard when computer is set up with user seated in normal user position. Adjusting brightness level up and down may be necessary to recreate issue. Yes Replace LED backlight board. Go to step 8. M04 No Noises that are not audible from the normal user position are considered acceptable. 8. Verify if noise is still present. Yes Replace LCD panel. If noise still present, go to Noise/ Hum/Vibration symptom flow.L06 No Issue resolved.
iMac (21.5-inch, Late 2009) Symptom Charts — Display 47 2010-11-18 LCD Image Issues Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone Quick Check SymptomQuick Check LCD Issues • Incorrect/missing colors • Distorted/blurred image • Pixel anomalies • Vertical/horizontal lines • Non-uniform brightness 1. Allow display to reach normal operating temperature for about 15 minutes before evaluating front-of-screen performance. 2. Check display preferences for use of custom display profile. 3. Check brightness setting. 4. Clean glass panel while checking for dust/debris. Deep Dive: General Check ResultAction Code 1. Verify if issue is incorrect/ missing colors. Yes Go to incorrect/missing colors. No Go to step 2. 2. Verify if issue is distorted/ blurred image. Yes Go to distorted/blurred image. No Go to step 3. 3. Verify if issue is bright or dark pixel anomalies. Yes Go to pixel anomalies . No Go to step 4. 4. Verify if issue is vertical or horizontal lines. Yes Go to vertical/horizontal lines. No Go to step 5. 5. Verify if issue is non-uniform brightness. Yes Go to non-uniform brightness. No LCD functioning OK. Return to appropriate symptom flow if user issue is still present.
iMac (21.5-inch, Late 2009) Symptom Charts — Display 48 2010-11-18 Incorrect/Missing Colors Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone Quick Check SymptomsQuick Check Incorrect/Missing Colors • Wrong color display • Color/contrast issues 1. Allow display to reach normal operating temperature for about 15 minutes before evaluating front-of-screen performance. 2. Verify if System Preferences > Display settings are configured to use default display profile. 3. Verify System Preferences > Universal Access > Display “Enhance contrast”, “Use grayscale”, and “Black on White/White on Black” settings are set to defaults. Deep Dive Check ResultAction Code 1. Verify computer has been warmed up for about 15 minutes to stabilize backlight before continuing. Yes Go to step 2. No Warm up computer for about 15 minutes. Go to step 2. 2. Verify if all four cables on back of LCD panel are secure at both ends. Yes Go to step 3. No Reseat connections, replace damaged cable(s) if needed. Retest. L14 3. Go to System Preferences > Desktop & Screen Saver > Desktop and set color to Solid Gray Light. Verify if incorrect/ missing color issue affects entire display. Yes Suspect poor video connection. Replace LVDS cable between LCD panel and logic board. L14 No Go to step 4. 4. Set up computer side-by-side with a known-good, same- model computer showing same image. Verify if issue is noticeably worse on display being tested. Yes Replace LCD panel. L02 No Small variations in color uniformity across display are normal and do not warrant replacement of LCD.
iMac (21.5-inch, Late 2009) Symptom Charts — Display 49 2010-11-18 Distorted/Blurred Image Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone Quick Check SymptomsQuick Check Distorted/Blurred Image • Text and graphics appear fuzzy • Image corrupted 1. Set System Preferences > Displays to native resolution of LCD. Non-native resolutions are unable to produce optimal clarity. 2. Clean outside of glass panel. 3. Boot from install DVD to determine if a potential software issue exists. Deep Dive Check ResultAction Code 1. Boot from Install DVD and verify if issue is still visible. Yes Go to step 2. No Issue likely caused by software or driver issue. Troubleshoot for software issues. Make sure all software updates have been installed. 2. Verify if issue is visible on an external display attached to mini DisplayPort. Yes Issue NOT caused by internal LCD panel. Go to step 3. No Go to step 6. 3. For systems without video card, go to step 4. If a video card is present, remove video card, inspect connector for damage or corrosion then reinstall. Verify if issue still occurs. Yes Replace video card. Go to step 4. M24 No Issue likely caused by poor video card connection. 4. Verify if distorted/blurred image issue is still present. Yes Replace logic board. For systems with a video card, reinstall the user’s original video card. Go to step 5. M04 No Issue resolved. 5. Verify if issue is still present with replacement logic board installed. Yes Return to step 1 and retest. No Issue resolved.
iMac (21.5-inch, Late 2009) Symptom Charts — Display 50 2010-11-18 6. Inspect glass panel. Verify if issue is caused by condensation or contaminants on inside surface of glass panel. Yes Clean glass and/or LCD using procedures in Glass Panel take-apart chapter. Identify possible sources of contamination (nearby cigarette/cooking smoke, heavy airborne dust, etc.) to prevent recurrence. Condensation should dissipate after computer has been running a few hours. No Go to step 7. 7. Remove LVDS cable between LCD panel and logic board, and verify if there is damage to cable or connectors. Yes Replace LVDS cable. X03 No Reinstall LVDS cable. Go to step 8. 8. Verify if issue is still visible after reinstalling LVDS cable. Yes Replace LCD panel. Go to step 9. L04 No Issue resolved. 9. Verify if issue is still present with replacement LCD panel installed. Yes Return to step 1 and retest. No Issue resolved.