Apple imac 20 inch mid 2009 User Manual
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iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 21 2010-11-24 2. Remove front bezel and locate diagnostic LED’s on logic board. Plug power cord into system. Verify whether diagnostic LED #1 turns ON. Yes Trickle voltage being supplied by power supply. Go to step 3. No Replace power supply. 3. Press power button while monitoring diagnostic LED’s. Does diagnostic LED #2 turn ON and remain ON after pressing the power button? Yes Power supply functioning and logic board detects supply voltages. Jump to Won’t Start Up. No Go to step 5. 4. Disconnect power then remove power supply and carefully inspect AC inlet and DC output connectors and cables for damage or poor connections. Were any problems identified? Yes Replace damaged part. P16 No Go to step 5. 5. Inspect power button and verify that it is properly connected to the logic board. Yes Visual inspection OK. Go to step 6. No Reconnect power button. Replace rear housing (which includes power button) or logic board if damage is present. X14 6. Disconnect power button from logic board and verify continuity between two pins when power button is pressed. Yes Power button is functioning correctly. Go to step 7. No Power button faulty. Replace rear housing which includes power button. X16 7. Press power button and verify whether system turns ON. Yes Power supply is functioning. If system still does not boot jump to Won’t Start Up. No Replace power supply. Retest. P01 Note: If No Power symptom persists after all steps have been followed use Minimum Configuration troubleshooting to proceed. Try disconnecting the hard drive, optical drive, AirPort, and Bluetooth modules to determine if one of them is preventing the power supply from functioning.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 22 2010-11-24 Won’t Start Up Quick Check SymptomsQuick Check Won’t Start Up • No startup chime. • Error tones during startup. • Grey screen with fan noise, or other noise. • Will not progress beyond Apple logo or spinning gear. 1. Isolate OS by starting up from original install media for the computer, the same make and model computer in Target Disk Mode, or compatible known-good OS on an external drive. Both AirPort and Bluetooth services are available when booted from the Install disk. 2. Reset SMC and PRAM to clear any stored, corrupted information. 3. Start up in Safe Mode by holding the shift key down during startup to load only required kernel extensions and disable all startup and login items. See KBase article http://support.apple.com/kb/HT1564 4. If system generates error tones there may be an issue with the SDRAM. See KBase article http://support.apple.com/kb/HT2341 5. Identifying when in the startup process the computer hangs can help isolate the issue. See KBase article http://support.apple.com/kb/HT2674 for information on the Macintosh startup sequence, error codes and symbols used. Deep Dive Check ResultAction Code 1. Boot the computer to Apple Hardware Test on the Install DVD. Does the computer boot up to this volume? Yes Run the extended tests and proceed with results. If AHT passes or boots with a memory error, go to step 2. No Go to step 2. 2. Remove the installed SDRAM, and test with known-good SDRAM. Does the computer startup properly now? Yes SDRAM issue. Replace SDRAM. Issue resolved. X02 No Go to step 3.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 23 2010-11-24 3. Remove the coin battery on the logic board, and leave out for approximately 1 minute. Then reinstall the battery. This will reset the logic board. Does the computer startup properly now? YesIssue resolved by logic board reset. Measure DC voltage on the battery touching the battery with the red probe, and grounding with the black probe. If voltage is 2.7v or less, replace the battery. See KBase article http://support.apple. com/kb/HT3250 for details on using a digital multi-meter. No Go to step 4. 4. Remove AirPort card and test. Does the computer startup properly now? Yes Go to AirPort Card Kernel Panic. No Go to step 5. 5. Disconnect the hard drive SATA cable and startup to the Install DVD on the optical drive, or an external volume. Does the computer startup properly now? Yes Go to Hard Drive Not Recognized. No Go to step 6. 6. Disconnect the optical drive and test. Does the computer start without kernel panic now? Yes Go to Optical Drive Not Recognized. No Replace logic board. M02
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 24 2010-11-24 Intermittent Shutdown Quick Check SymptomsQuick Check Intermittent Shutdown • Powers off during startup. • Powers off during desktop use. • Computer restarts spontaneously. • Powers off when waking from sleep. 1. Isolate OS by starting up from original Install media for the computer, the same model computer in Target Disk Mode, or compatible known-good OS on an external drive. Both AirPort and Bluetooth services are available when booted from the Install disc. 2. Reset SMC and PRAM to clear any stored, corrupted information. 3. Start up in Safe Mode by holding the shift key down during startup to load only required kernel extensions and disable all startup and login items. See KBase article http://support.apple.com/kb/HT1564 4. Open System Preferences > Energy Saver > Schedule and make sure that a ‘Shut Down’ event is not scheduled. 5. Make sure that power cord is securely attached to the back of the computer, and is not hindered by a desk or other furniture. 6. Plug the computer directly into an AC outlet to test whether a surge protector, outlet strip, or UPS is causing the issue. Deep Dive Check ResultAction Code 1. Verify improper shutdown in Console: - for Mac OS 10.5 or earlier, look in system.log - for Mac OS 10.6, look in /private/var/log/kernel.log Filter the log for “shutdown cause”. Entries of value “0” or a negative value indicate an improper shutdown. Did you find entries of improper shutdown? Yes Determine if user caused improper shutdown. Use known-good AC power cord and AC outlet. Go to step 2. No Revisit Quick Check examples for possible software issues. Check if user is running other automating software that may be shutting down system. Verify issue and jump to appropriate symptom flow. No repair needed under current symptom flow.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 25 2010-11-24 2. With known-good AC power cord and AC outlet, does the unit continue to shutdown? Yes Go to step 3. No AC power cord/ outlet issue. Issue resolved. X03 3. Disconnect the hard drive power cable from the hard drive and start the machine from the Install DVD, the same make and model computer in Target Disk Mode, or compatible known-good OS on an external drive. Does the computer continue to shutdown? Yes Go to step 4. No Possible bad software or hard drive. Go to Hard Drive Not Recognized. 4. Inspect and reseat DC power cable and AC inlet connections to power supply and logic board. Was damage observed on the cables or connectors. Yes Replace damaged cable. Retest. Return to step 1 if problem continues. X03 No Go to step 5. 5. Install known-good power supply. Does system continue to restart or shutdown? Yes Reinstall original power supply. Replace logic board. Go to step 6. No Power supply issue. Issue resolved. P02 6. After logic board replacement. does the computer continue to shutdown? Yes Use Minimum Configuration troubleshooting to isolate failed module. No Logic board issue. Issue resolved. M08
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 26 2010-11-24 Kernel Panic, System Crashes Quick Check SymptomsQuick Check Kernel Panic, System Crashes • Kernel panic on startup or desktop use. • System freeze during use. • System freeze upon wake from sleep. 1. Isolate OS by starting up system from original Install media for the computer, the same make and model computer in Target Disk Mode, or compatible known-good OS on an external drive. Both AirPort and Bluetooth services are available when booted from the Install disc. 2. Ensure that all software and firmware updates for the computer have been installed. 3. Reset SMC and PRAM to clear any stored, corrupted information. 4. Start up in Safe Mode by holding the shift key down during startup to load only required kernel extensions and disable all startup and login items. See KBase article http://support.apple.com/kb/HT1564 5. Check the panic.log, located /Library/Logs/ Panicreporter, for information in the backtrace that may give clues about the kernel panic. 6. For more information on kernel panics refer to KBase article http://support.apple.com/kb/HT1392 Deep Dive Check ResultAction Code 1. Boot the machine to Apple Hardware Test on the Install DVD. Does the computer boot up to this volume? Yes Run the extended tests and proceed with results. If AHT passes or boots with a kernel panic, go to step 2. No Go to step 2. 2. Remove all peripheral devices including the keyboard and mouse. Does computer start without kernel panic? Yes Add peripheral devices one at a time until the kernel panic repeats. Replace the device causing the issue. No Go to step 3.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 27 2010-11-24 3. Use known-good SDRAM in the system. Does the computer start without kernel panic now? Yes Install user’s SDRAM and test. If kernel panic repeats, replace SDRAM. Verify that the correct SDRAM is being used. X01 No Go to step 4. 4. Remove AirPort card and test. Does the computer start without kernel panic now? Yes Go to AirPort Card Kernel Panic. No Go to step 5. 5. Disconnect the hard drive SATA cable and startup to the Install DVD on the optical drive, or an external volume. Does the computer start without kernel panic now? Yes Go to Hard Drive Not Recognized. No Go to step 6. 6. Disconnect the camera/ microphone cable. Does the computer start without kernel panic now? Yes Go to Camera Issues. No Go to step 7. 7. Disconnect the audio board and test. Does the computer start without kernel panic now? Yes Replace audio board. X99 No Go to step 8. 8. Disconnect the optical drive and test. Does the computer start without kernel panic now? Yes Go to Optical Drive Not Recognized. No Replace logic board.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 28 2010-11-24 No Video Unlikely cause: hard drive, optical drive, speakers, camera, microphone Quick Check SymptomsQuick Check No Video • No image. • Backlight failure. 1. Check brightness setting. 2. For no-video issues, connect an external display to verify whether iMac video circuitry is functioning. If image appears on external display go to Backlight Issue/No Backlight. 3. Reset SMC. Deep Dive Check ResultAction Code 1. Verify boot chime present and fans running when system powered ON. (Reset SMC and clear PRAM if necessary for proper boot up.) Yes Power ON self test OK. Boot sequence started. Go to step 2. No Go to Won’t Start Up. 2. Verify whether image is visible on LCD panel. Yes Video present. Verify system functionality and return to user or jump to appropriate troubleshooting flow. No Go to step 3. 3. Connect supported external display. Verify whether image appears on external display when system is booted. Yes External display detected by system. Video circuitry on logic board functional. Go to Backlight Issue/No Backlight No Go to step 4. 4. Remove glass panel and front bezel. Do all three diagnostic LED’s turn ON shortly after the system is powered ON? Yes Internal video circuitry functional and communicating with LCD panel. Go to Backlight Issue/ No Backlight. No Replace logic board. Retest. M03
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 29 2010-11-24 Corrupted Video Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone Quick Check SymptomsQuick Check Corrupted Video • Text and graphics appear fuzzy • Image corrupted 1. Set System Preferences/Display LCD panel to native resolution. Non-native resolutions are unable to produce optimal clarity. 2. Make sure all relevant software updates have been applied. Graphics driver updates may be included with software updates. 3. When the issue occurs take a screenshot of the display (Command-Shift-3). View the screen shot file on another known-good computer. If the image corruption can be seen in the screenshot then the issue is with the video drivers, software, or video/logic board. If the issue cannot be seen in the screenshot then the LCD panel and LVDS cable should be tested further. 4. Clean the outside surface of glass panel using provided cleaning cloth. 5. Boot from install DVD or another known-good volume to determine whether a potential software/driver issue exists. Deep Dive Check ResultAction Code 1. Boot from Install DVD and verify whether 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 whether issue is visible on an external display attached to the DisplayPort. Yes Issue is NOT caused by internal LCD panel. Go to step 3. No Go to step 5.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 30 2010-11-24 3. Remove logic board, inspect connectors for damage or corrosion then reinstall. Verify whether issue still occurs. Yes Replace logic board. Go to step 4. M04 No Issue likely caused by poor connection. Return computer to user. M04 4. Verify whether issue is still present with replacement logic board installed. Yes Return to step 1 and retest. X04 No Issue resolved with replacement logic board. Return computer to user. M04 5. Remove LVDS cable from LCD panel and logic board and carefully verify whether there is damage to the cable or connectors. Yes Replace LVDS cable. No Reinstall LVDS cable. Go to step 6. 6. Verify whether issue is still visible after reinstalling LVDS cable. Yes Replace LCD panel. Go to step 7. No Issue resolved with replacement logic board. Return computer to user. M04 7. Verify whether issue is still present with replacement LCD panel installed. Yes Return to step 1 and retest. No Issue resolved with replacement LCD panel. Return computer to user. L04