Apple imac 20 inch mid 2009 User Manual
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iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 81 2010-11-24 Deep Dive CheckResultAction Code 1. Does the computer recognize at all the keyboard or mouse when plugged into the rear USB ports on the back of the iMac? Yes Test in all USB ports to ensure all USB ports working as expected. Replace logic board for any rear port failures. Replace keyboard for any keyboard USB port failures. Go to step 2. No Go to USB Devices Not Recognized. 2. Is keyboard working as expected? Yes Go to step 3. No Go to Wired Keyboard Does Not Function Properly. 3. Does the Mighty Mouse have an issue with the scroll ball? Yes See KBase article http://support.apple.com/ kb/HT3226 for steps to correct. No Go to step 4 4. Doe the Mighty Mouse have an issue with the buttons? Yes See KBase article http://support.apple.com/ kb/HT1581 for steps to determine expected behavior. Go to step 7. No Go to step 5. 5. Does the Mighty Mouse have an issue with tracking? Yes Try using the mouse on another surface. Non- reflective, opaque surfaces without repetitive patterns work best. The surface should be clean but not shiny. Go to step 6. No Go to step 7. 6. When used on another surface does the mouse track correctly? Yes Surface issue. Issue resolved. No Go to step 7. 7. See KBase article http:// support.apple.com/kb/ HT1581 to further determine expected behavior. Did this article resolve the issue? Yes Issue resolved. No Replace Mighty Mouse. K99
iMac (20-inch, Early/Mid 2009) Symptom Charts — Input/Output Devices 82 2010-11-24 Uncategorized Symptoms Quick Check SymptomsQuick Check Uncategorized Symptoms • Unable to locate appropriate symptom code. 1. Verify that external I/O device (where applicable) works on another system. 2. For third party I/O devices make sure necessary software is installed and up to date, and that the device is supported with the user’s system. 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. Provide as much detail as possible. N99
iMac (20-inch, Early/Mid 2009) Symptom Charts — Mechanical 83 2010-11-24 Mechanical Noise/Hum/Vibration Unlikely cause: LCD panel, glass panel, enclosure, cables Quick Check SymptomsQuick Check Noise/Hum/Vibration • Buzzing noise • Rattling noise • Ticking noise • Squeaking noise 1. Verify the vents on the bottom and back of the computer are free of dust and other obstructions that might inhibit proper airflow. 2. Launch Applications/Utilities/Activity Monitor. Determine whether an application or process is consuming a high percentage of CPU bandwidth. CPU-intensive applications can cause the fans to run fast in order to maintain the proper internal system temperatures. If needed, quit the application or restart the computer. 3. Eject optical media from optical drive. Out-of- balance optical media can generate audible noise. Try a different brand of media. For additional info jump to Optical Drive Noisy. 4. Tilt display to hinge limits to determine if noise is generated by the hinge mechanism. For additional info, jump to Stand/Hinge Issues. 5. Play sound sample at loud and soft volume levels to determine if the noise is caused by the left/right speakers or the amplifier circuit. For additional info, jump to Audio: Built-in Speakers Have Distorted Sound. 6. Adjust the display brightness to determine whether the noise is related to the brightness level. For additional info, jump to Noise/Unstable Flickering.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Mechanical 84 2010-11-24 Deep Dive CheckResultAction Code 1. Run Apple Hardware Test from system or Install DVD. Did AHT generate any errors? Yes Go to Apple Hardware Test (AHT ) Error Codes table to decode error. Follow instructions in table for resolving error, then retest. No Go to step 2. 2. Does noise sound like one or more fans running faster than expected? Yes Reset SMC by disconnecting power cord for ~15 seconds, then retest. If issue continues go to step 3. No Go to step 5. 3. Does the noise change when the optical drive is being accessed or media is inserted or ejected? Yes Suspect issue with optical drive or the media being used. For additional info, jump to Optical Drive Noisy. No Go to step 4. 4. Mute the system volume. Verify whether the issue still occurs. Yes Go to step 5. No Suspect issue with speakers or audio amplifier circuitry. For additional info, jump to Audio: Built-in Speakers Have Distorted Sound. 5. Adjust the brightness on the display between the maximum and minimum settings. Determine whether the issue changes depending on the brightness level. Yes Suspect issue with LCD display or inverter. For additional info, jump to Noise/Unstable Flickering. No Go to step 6. 6. Remove fans and rotate the blades. Verify that fan blades spin smoothly without interference from fan housing. Yes Go to step 7. No Replace affected fan(s). P04
iMac (20-inch, Early/Mid 2009) Symptom Charts — Mechanical 85 2010-11-24 7. Reinstall fans while carefully ensuring that there are no cables routed under or near fan assembly that might cause interference with the fan blades. After reassembling system verify that the noise issue is resolved. Yes Noise issue resolved. Suspect issue cause by interference from wiring or possible distortion or fan housing when installed in system. Proper reassembly resolved issue. P04 No Go to step 8. 8. Temporarily remove LCD display then power ON system. Determine whether source of noise can be located. Caution: The exposed power supply poses a serious shock hazard. Take proper precautions when working around an energized system. Yes Identify, inspect, and if necessary replace the part that caused the noise issue. P04 No Go to step 9. 9. Disconnect these major modules/parts (hard drive, optical drive, fans, LCD display one at a time then power ON the system. Determine if noise issue goes away when one of the modules is disconnected. Caution: The exposed power supply poses a serious shock hazard. Take proper precautions when working around an energized system. Yes Identify, inspect, and if necessary, replace part that caused the noise to disappear when it was disconnected from the system. P04 No All parts verified. Verify that the correct symptom flow is being used.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Mechanical 86 2010-11-24 Fan Failures / Thermal Issues Unlikely cause: speakers Quick Check SymptomsQuick Check System Runs Hot • System feels very hot • Fan(s) not operating • Fan(s) running fast • System is noisy 1. Verify the vents on the bottom and back of the system are free of dust and other obstructions that might inhibit proper airflow. 2. Verify the computer is not exposed to direct sunlight which may heat up the enclosure, making it feel hot to the touch. 3. Verify the computer is not running hotter than expected for normal operation. If possible, compare to a similarly configured system. Note: The power supply is located in the upper left corner where the highest temperatures can usually be felt. 4. Launch Applications/Utilities/Activity Monitor. Determine whether an application or process is consuming a high percentage of CPU bandwidth. CPU intensive applications can cause fans to run fast in order to maintain the proper internal system temperatures. If needed, quit the application or restart the system. 5. Reset SMC by unplugging power cord for ~15 seconds. Deep Dive Check ResultAction Code 1. Run Apple Hardware Test from system or Install DVD. Did AHT generate any errors? Yes Suspect possible fan or sensor error. Go to Apple Hardware Test (AHT ) Error Codes table to decode error. Follow instructions in table for resolving error, then retest. No Go to step 2. 2. Does noise sound like one or more fans running faster than expected? Yes Fans running fast. Reset SMC by disconnecting power cord for ~15 seconds then retest. If issue continues go to step 3. No Go to step 3.
iMac (20-inch, Early/Mid 2009) Symptom Charts — Mechanical 87 2010-11-24 3. Remove fans and rotate the blades. Verify that fan blades spin smoothly without interference from fan housing and that the fan blades are all intact. Yes Go to step 7. No Replace affected fan(s). P06 Stand/Hinge Issues Symptoms Quick Check Stand/Hinge Issues • Bent stand • Broken hinge • Stripped screw/head • Stripped screw boss 1. Determine whether damage caused by user / technician environment, accidental damage, or abuse. If so, inform user/technician the failures are not covered by Apple warranties. Refer to http://www.apple.com/legal/warranty 2. For hinge noise issues replace mechanism. Physical Damage Symptoms Quick Check Physical Damage • Broken glass • Bent stand • Broken hinge • Stripped screw/head • Stripped screw boss • Dent or scratch to chassis 1. Determine whether damage caused by user environment, accidental damage, or abuse. If applicable inform the user that Apple does not warrant damage caused by accident, abuse, misuse, flood, fire, earthquake, or other external causes. For more information refer to: http://www.apple.com/legal/warranty
iMac (20-inch, Early/Mid 2009) Symptom Charts — Mechanical 88 2010-11-24 Uncategorized Symptoms CheckResultAction 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. Provide as much detail as possible. N99
© 2009-2010 Apple Inc. All rights reserved. Apple Technician Guide Take Apart iMac (20-inch, Early/Mid 2009)
iMac (20-inch, Early/Mid 2009) Take Apart — General Information 90 2010-11-24 General Information Opening the Unit • The iMac (20-inch, Early/Mid 2009) 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 iMac (20-inch, Early/Mid 2009): • 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 Torx T8 screwdriver • Magnetized Torx T6 screwdriver • Magnetized Phillips #2 screwdriver • Black stick (nylon probe, Apple part #922-5065) or other non-conductive nylon or plastic flat-blade tool • EMI tape (Apple part #922-8691) • Digital volt meter (for troubleshooting) • Soft, clean towel or cloth (to protect the display and removed parts from scratches) For more information about tools, refer to: kBase #HT3452: Hand Tools for Desktop and Portable Repairs