Contents About This Guide, Basics | Apple MD094LL/A specs

iMac (27-inch, Mid 2010)

Contents

About This Guide

Updates 10

Updated 9 September 2010 10 Updated 9 August 2010 10

Apple Technician Guide introduced 27 July 2010 10

Feedback 10

Basics

Overview 12

Identifying Features 13
Product Configurations		13
Safety Precautions	14
Serial Number Location		15
New Accessories	16
Magic Trackpad	16
Apple Battery Charger		18

Troubleshooting

General Troubleshooting		20
Wireless Troubleshooting		20
Update System Software & Firmware 20
Troubleshooting Theory	20
Hardware vs. Software	21
Common Reset Procedures 21
Power On Self Test (POST)		21
Resetting the System Management Controller (SMC) 22
Resetting Parameter RAM (PRAM) 22
Starting Up in Safe Mode		23

Removing the Battery, Measuring DC Voltage 24

Diagnostics 25

Sensors Errors 25

Sensor Locations 27

Diagnostic LEDs 29

Location of Diagnostic LEDs 29

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Apple MD094LL/A manual Contents About This Guide, Basics, Troubleshooting

Contents

 Apple Technician Guide IMac 27-inch, Mid USA Contents About This Guide TroubleshootingBasics Symptom Charts General Information Take Apart Vertical Sync Cable Vsync Bluetooth Board LCD Panel Handling the Panel Video Card Views Additional Procedures  Apple Technician Guide About This Guide Feedback UpdatesUpdated 9 September Updated 9 August  Apple Technician Guide Basics Overview Product Configurations Identifying Features Safety Precautions Serial Number Location About the Indicator Light New Accessories Magic Trackpad Pairing the Magic Trackpad Batteries Apple Battery Charger  Apple Technician Guide Troubleshooting Troubleshooting Theory General TroubleshootingWireless Troubleshooting Update System Software & Firmware Hardware vs. Software Common Reset Procedures Power On Self Test Post Resetting Parameter RAM Pram Resetting the System Management Controller SMC Starting Up in Safe Mode Removing the Battery, Measuring DC Voltage Suggested Action DiagnosticsSensors Errors Sensor Board Sensor cable if damaged Logic board this sensor is part Video card assembly Sensor Locations Sensor Connector Locations Top Side of Logic Board Sensor Connector Location Back Side of Logic Board Location of Diagnostic LEDs Diagnostic LEDs LED #3 LED FunctionsLED #1 LED #2 LED #1 = Power available LED #1 + LED #2 = Power available, and system is powered onLED Startup Sequence Function According to user setupBoard, to enable backlight Logic Board Test Points Functional Overview Refer to this diagram to see how modules are interrelated Block Diagram Check Result Action Code Symptom ChartsNo Power, Dead Unit Symptoms Quick Check No Power, Dead Unit To Won’t Start Up symptom Won’t Start Up Symptoms Quick Check Won’t Start UpSafe Boot, Safe Mode? Sequence and error codes, symbols for Go to Optical Drive Not Using a digital multimeterGo to AirPort Card Kernel Go to Hard Drive Not Intermittent Shutdown Troubleshooting Shutdown Causes Power-related system shut downs Symptoms Quick Check Intermittent Shutdown Make sure that power cord is securely attachedPowers off during startup Cord and AC outlet, Verify if Hard drive, update OS withOS on an external drive. Verify Recognized symptom flow Supply replacement P17 X03M23 X22 Kernel panic messages Symptoms Quick Check Kernel Panic, System CrashesKernel Panic, System Crashes About You need to restart your computer Go to SD Card Not Go to Camera Issues orGo to AirPort/Bluetooth X01 Go to Won’t Start Up Symptoms Quick Check No VideoGo to Backlight Issue/No No Video L03 Diagnostic LEDs on edgeLocate diagnostic LEDs on M03 Video drivers, software, or video/logic board Symptoms Quick Check Corrupted VideoIf issue cannot be seen in the screenshot then Corrupted Video M04 Cable and go to step Utility Diagnostic and enterResolved with replacement LCD panel Disconnect DisplayPort cable Yes Replace DisplayPort cable Burnt Smell/Odor Symptoms Quick Check Burnt Smell/Odor Uncategorized Symptoms No Power, Dead Unit symptom flowSmfeedback2@apple.com Symptoms Quick Check Backlight Issue/No Backlight Backlight Issue/No Backlight Display Panel. Run Apple Service Display Utility to verifyPanel with correct backlight Logic board and LCD panel Symptoms Quick Check Noise / Unstable Flickering Display Backlight Issue / No BacklightNoise / Unstable Flickering Utility to verify the resolution Run Apple Service Display When adjusting brightness level Symptom flow Issue resolvedTo Noise/Hum/Vibration LCD Image Issues Go to non-uniform Go to pixel anomaliesGo to vertical/horizontal Lines Incorrect/Missing Colors Symptoms Quick Check Incorrect/Missing Colors L02 Yes Replace LCD panel. Run Software issue exists Symptoms Quick Check Distorted/Blurred ImageClean outside of glass panel Boot from install DVD to determine if a potential Reinstalling internal DisplayPort Pixel Anomalies Do not replace LCD panel L08 M24 Symptoms Quick Check Vertical/Horizontal LinesVertical/Horizontal Lines Noise / Unstable Flickering Service Display Utility to Issue resolved. If video cardL04 Symptoms Quick Check Non-Uniform Brightness/Color Service Display Utility. ToNon-Uniform Brightness / Color Symptoms Quick Check Cosmetic Defects to LCD Cosmetic DefectsCracked glass panel Hard Drive Not Recognized Symptoms Quick Check Drive Not RecognizedDrive No Boot Error codes, symbols System boots successfully To user Check that the 4 wire Sata Yes Replace any damaged SataPower cable carrying 12v Logic board Reboot computer. Verify if Yes Go to Optical Drive Read Hard Drive Read/Write Errors H03 Mac OS without errorsH04 If computer starts up Refer to Kbase article TS3204 Evaluating Symptoms Quick Check Hard Drive NoisyHum/Vibration symptom Hard Drive Noisy H06 Hard driveGo to Fan Failures/Thermal Optical Drive Not Recognized Symptoms Quick Check Drive Not Recognized/Mount Drive Won’t Eject Media Symptoms Quick Check Drive Won’t Accept MediaNot Recognized symptom flow Optical Drive Won’t Accept/Eject Media Optical Drive Read/Write Error Symptoms Quick Check Drive Read/Write Data ErrorJ03 Diagnostics, replace optical Drive Replace optical drive Install known-good opticalDrive SATA+Power cable Issue resolved CD and DVD media. Verify if Same type to rule out media issue Optical Drive Not Performing to SpecificationsSymptoms Quick Check Optical Drive Not Performing to Specifications Optical drive Running diagnostics, replace Compare system with similar Symptoms Quick Check Optical Drive Noisy J04Optical Drive Noisy Test optical drive with different Tighten SD reader board Now fits in slot Screws. Go to step SD Card Will Not Insert Into SlotSeat into slot Media Cards MMC Verify if known-good SD card SD Card Not Recognized Symptom Quick Check SD Card Not Recognized Correctly read and written Interference AirPort/Bluetooth IssuesIssue. See kBase #HT1365 Airport potential KBase #HT1365 AirPort Potential source N04 Html?path=AirPort/5.0/en Bluetooth issues are resolved M11Discoverable mode. Verify if AirPort Card Kernel Panic Symptoms Quick Check AirPort Card Kernel Panic Symptoms Quick Check Ethernet Port/Device Issue Ethernet Port/Device Issue Html?path=Mac/10.6 Wireless Input Device Does Not PairKBase #HT2532 Mac OS How to change the MTU for Troubleshooting purposes Loses Connection symptom Go to Wireless Input Device Go to step With customer’s mouse Yes Connector is damagedGo to Wireless Input Device Loses Connection symptom Verify System Preferences/Network settings Apple Remote Inoperable Symptoms Quick Check Apple Remote Inoperable Yes Lens blocked or sensor not That computer nowResponds to Apple Remote Symptoms Quick Check Audio Microphone Audio MicrophoneM09 Is normal during playback Inspect microphone cable Yes Replace rear housingAudio Built-in Speakers Have Distorted Sound L14 Audio Symptoms Quick CheckSee kBase #TS1574 Troubleshooting issues Audio No Audio from Built-in Speakers Go to step Quality is acceptable Set speaker balance 100% Device, replace audio cableOutput and verify that Internal Board Go to System Preferences Persists, verify if symptom has Symptoms Quick Check Camera Issues Camera Issues Mode. Verify if FireWire device FireWire Device Not RecognizedFor external FireWire drives, make sure any Unplug all FireWire devices Software on User account. Issue USB Device Not Recognized Symptoms Quick Check USB Device Not Recognized M15 Bluetooth not recognized Go to Keyboard Specific Keys Do Not Respond Wired Keyboard Does Not Function ProperlySymptoms Quick Check Wired Keyboard Does Not Function Properly Accept/Eject Media Go to Optical Drive Won’t Wired Keyboard/Mouse Not Recognized Input Device Doesn’t Pair symptom flow toKeyboard Specific Keys Do Not Respond Not Function Properly Clean your Mighty MouseTroubleshooting Mighty Mouse and determining Go to USB Device Not Pair with computer Not charge batteries Not charge batteries Apple Wireless Mouse/Magic Trackpad Erratic Tracking Symptoms Quick Check Apple Wireless Mouse/MagicTrackpad erratic tracking Wireless Input Device Loses Connection K08 P10 Apple Battery Charger Does Not Charge BatteriesCharge Batteries P01 Device is supported with user’s system Was installed in chargerSoftware is installed and up-to-date, and that Vary from 80% to almost full Noise/Hum/Vibration Symptoms Quick Check Noise/Hum/VibrationStand/Hinge Issues symptom flow Unstable Flickering symptom flow Board. Go to Noise/Unstable Location table in GeneralGo to Optical Drive Noisy Go to Audio Built-in Speakers Have Distorted P04 From fan housingReinstall fans while carefully Yes Being used When working around an Energized system System feels very hot Fan Failures / Thermal IssuesSymptoms Quick Check Fan Failures / Thermal Issues Verify that vents on bottom and back of system Manuals available at http//support.apple.com Stand/Hinge IssuesSymptoms Quick Check Stand/Hinge Issues X23 Broken glass Symptoms Quick Check Physical DamagePhysical Damage Verify if damage caused by user environment  Service Source Take Apart KBase #HT3452 Hand Tools for Desktop and Portable Repairs General InformationOpening the Unit Required Tools Required Special Tools for Glass Panel Cleaning Tools Starter Kit Do’s and Don’ts Cleaning & Handling the Glass Panel Handling a Broken Glass Panel How to Remove a Broken Glass Panel IMac 27-inch, Mid 2010 Take Apart General Information IMac 27-inch, Mid 2010 Take Apart General Information IMac 27-inch, Mid 2010 Take Apart General Information IMac 27-inch, Mid 2010 Take Apart General Information Safety Reassembly Steps Logic Board HandlingScrew Sizes ESD mat and wrist strap Phillips #2 screwdriver Access DoorFirst Steps Tools Removal ESD mat and wrist strap Access doorMemory Remove Reassembly Glass Panel Shut down unit Unplug all cables Put on ESD strapMicrofoam bag Removal Reassembly Set unit in upright position to minimize settling of dust IMac 27-inch, Mid 2010 Take Apart Glass Panel Glass panel Camera Removal Reassembly LCD Panel Remove 8 T10 screws Reassembly Note IMac 27-inch, Mid 2010 Take Apart LCD Panel Pull display forward slightly to disconnect Important Panel Handling information Mylar tape Aluminum tape Replacement LCD panel includes Vsync cable Important Handle LCD panel by the edges only Handling the Panel Connect the DisplayPort cable IMac 27-inch, Mid 2010 Take Apart LCD Panel IMac 27-inch, Mid 2010 Take Apart LCD Panel Pull cable straight out of connector Vertical Sync Cable VsyncGlass panel LCD panel LED Temp Sensor Cable Peel black insulator to access cable No tools are required for this procedure DisplayPort CablePeel back mylar tape securing cable to LCD panel IMac 27-inch, Mid 2010 Take Apart DisplayPort Cable Torx T10 screwdriver ESD mat and wrist strap Audio Ports and Cable Also help keep audio cable aligned while tightening screws Magnetized Torx T8 screwdriver ESD-wrist strap and mat AirPort Antenna Disconnect antenna cable from AirPort card Magnetized Torx T6 screwdriver ESD-wrist strap and mat AirPort Card Hold card by edges and pull it out of the slot Remove 1 T6 screw 922-8579 AirPort Carrier Board Glass panel LCD panel AirPort cardMagnetized Torx T10 screwdriver ESD-wrist strap and mat Disconnect Airport data cable Remove 2 T10 screws 922-6850 AirPort Cable Glass panel LCD panel AirPort carrier boardTools ESD-wrist strap and matt Black stick Removal Bluetooth Antenna Disconnect Bluetooth antenna from the Bluetooth card Bluetooth Board Removal LED Backlight Board Removal Voltage Power Supply Longer self-tapping 922- 9593, long L Remove 4 T10 screws Self-tapping, 922- 6850, short S Route AC power inlet cable over power supply pressure wall Backlight Pressure Wall Glass panel LCD panel Power supply Lift pressure wall off posts in the rear housing Power Supply/Hard drive Pressure Wall Lift pressure wall off posts in the rear housing Replace Kapton tape securing AC inlet cable to pressure wall Hard Drive Removal Orient drive with circuit board facing up as shown Glass panel LCD panel Hard drive Hard Drive Sensor Cable Each hard drive manufacturer has a unique sensor cable Torx T10 screwdriver ESD-wrist strap and mat Optical Drive Removal IMac 27-inch, Mid 2010 Take Apart Optical Drive Reassembly Replace screws in order shown Optical Sensor Cable Glass panel LCD panel Optical driveTools ESD-wrist strap and mat Peel up foam gasket to release sensor end of cable Optical Drive Fan Remove 1 T10 screw 922-9236 SD Card Reader EEE codeTorx T8 screwdriver ESD-wrist strap and mat Black stick Removal Reassembly Glass panel LCD panel Optical drive Optical drive fan SD Card Reader Cable IMac 27-inch, Mid 2010 Take Apart SD Card Reader Cable ESD-wrist strap and mat Black stick IR Board and Cable Removal Transfer this jumper if replacing the logic board Logic Board Power button CPU fan Skin temp sensor 922-6800, 2 short 922-9237, 2 20mm, medium Handling Logic Board Carefully lift board up and out of rear housing Reassembly IMac 27-inch, Mid 2010 Take Apart Logic Board IMac 27-inch, Mid 2010 Take Apart Logic Board IMac 27-inch, Mid 2010 Take Apart Logic Board Hard drive temp sensor or HD jumper if SSD-only config IMac 27-inch, Mid 2010 Take Apart Logic Board Video Card Removal IMac 27-inch, Mid 2010 Take Apart Video Card Torx T8 screwdriver Black stick ESD-wrist strap and mat Solid State Drive SSD Removal Lift pressure wall and SSD drive from rear housing Use a black stick to pry pressure wall off rear housing Reassembly SSD Data Cable Disconnect SSD data cable from top of SSD drive Optical/MXM Pressure Wall Remove 1 T8 screw on pressure wall Hard Drive Data Cable Removal IMac 27-inch, Mid 2010 Take Apart Hard Drive Data Cable Optical Drive Data Cable Disconnect optical data cable from back side of logic board Replacement Note Black stick ESD mat and wrist strap Battery Make sure battery socket is open and free of dust Right Speaker Removal CPU Fan Remove 2 T10 shoulder screws Route sensor cable through clip on fan Black stick ESD-wrist strap and mat Ambient Temp Sensor Release sensor cable from 2 cable clips on CPU fan Left Speaker Removal IMac 27-inch, Mid 2010 Take Apart Left Speaker Hard Drive Fan Removal ESD-wrist strap and mat Magnetized Torx T10 screwdriver Mechanism Cover Peel up aluminum tape 922-6800Pry cover off mechanism No preliminary steps are required to remove the stand Stand Remove the access card Remove 8 T10 screws 922-8174 Stand the computer upright Mechanism Remove 6 T10 screws 922-9238 Lift mechanism off rear housing Bluetooth Cable Removal IMac 27-inch, Mid 2010 Take Apart Bluetooth Cable Camera Cable Glass panel LCD panel Camera Hard drive Power supply Disconnect camera cable #5 from the top of logic board IMac 27-inch, Mid 2010 Take Apart Camera Cable Sata Cable, AC/DC Power/Backlight Removal SATA, SSD Disconnect SSD drive power cable from top of SSD drive 2010-09-09 Microphone Cable Refer to the rear housing procedure Rear Housing When replacing the rear housing follow these important steps Reinstall 4 screws Transfer Camera and Reuse Thermal Paste IMac 27-inch, Mid 2010 Take Apart Rear Housing  Service Source Additional Procedures Overview Retrieving Mechanism Removal 2010-09-09 2010-09-09  Service Source Views Exploded View #1 Exploded Views Exploded View #2 Exploded View #3 Rear View External Views Ports Photo of Components below LCD Internal Views Photo of Components in the Rear Housing Logic Board, Front Side Logic Board, Back Side 922-9244 922-9593 922-9241 Screw Chart922-9246 922-9239 922-4723 922-9247 922-8579 922-6850 922-7971 922-9236 922-6800 922-9237922-9243 922-9242 922-9238 922-8174 922-9488 922-7018