Manuals / Apple / Computer Equipment / Personal Computer

Apple MD094LL/A manual Block Diagram, Refer to this diagram to see how modules are interrelated

Models: MD094LL/A

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Block Diagram

Refer to this diagram to see how modules are interrelated.

AC Inlet

Optical Drive

Temperature

Sensor

Display

Backlight

Controller

MXM

Temp

Sensor

Optional

SSD drive

Hard Drive

Temperature

Sensor

Camera

AC/DC

IR Sensor

SD Card

Reader

Microphone

MLB

	SO-DIMM
Bluetooth	SO-DIMM
Antenna	SO-DIMM
	SO-DIMM

Fan

Fan

Fan

Power

Button

Speakers

802.11n

Antenna

Antenna

Ambient

Temperature

Sensor

Speakers

2010-09-09

iMac (27-inch, Mid 2010) — General Troubleshooting 34

Image 34

Apple MD094LL/A manual Block Diagram, Refer to this diagram to see how modules are interrelated

Contents

 Apple Technician Guide IMac 27-inch, Mid USA Troubleshooting Contents About This GuideBasics Symptom Charts Take Apart General Information Handling the Panel Bluetooth Board LCD Panel Vertical Sync Cable Vsync Video Card Additional Procedures Views Apple Technician Guide About This Guide Updated 9 August UpdatesUpdated 9 September Feedback Apple Technician Guide Basics Overview Identifying Features Product ConfigurationsSafety Precautions Serial Number Location New Accessories Magic Trackpad About the Indicator LightPairing the Magic Trackpad Apple Battery Charger Batteries Apple Technician Guide Troubleshooting Update System Software & Firmware General TroubleshootingWireless Troubleshooting Troubleshooting TheoryCommon Reset Procedures Power On Self Test Post Hardware vs. SoftwareResetting the System Management Controller SMC Resetting Parameter RAM PramStarting Up in Safe Mode Removing the Battery, Measuring DC Voltage Sensor DiagnosticsSensors Errors Suggested ActionLogic board this sensor is part Video card assembly Board Sensor cable if damagedSensor Connector Locations Top Side of Logic Board Sensor LocationsSensor Connector Location Back Side of Logic Board Diagnostic LEDs Location of Diagnostic LEDsLED #2 LED FunctionsLED #1 LED #3LED #1 + LED #2 = Power available, and system is powered on LED #1 = Power availableLED Startup Sequence Logic Board Test Points According to user setupBoard, to enable backlight FunctionFunctional Overview Block Diagram Refer to this diagram to see how modules are interrelatedSymptoms Quick Check No Power, Dead Unit Symptom ChartsNo Power, Dead Unit Check Result Action CodeTo Won’t Start Up symptom Sequence and error codes, symbols for Symptoms Quick Check Won’t Start UpSafe Boot, Safe Mode? Won’t Start UpGo to Hard Drive Not Using a digital multimeterGo to AirPort Card Kernel Go to Optical Drive NotTroubleshooting Shutdown Causes Intermittent ShutdownPower-related system shut downs Make sure that power cord is securely attached Symptoms Quick Check Intermittent ShutdownPowers off during startup Supply replacement Hard drive, update OS withOS on an external drive. Verify Recognized symptom flow Cord and AC outlet, Verify ifX22 X03M23 P17About You need to restart your computer Symptoms Quick Check Kernel Panic, System CrashesKernel Panic, System Crashes Kernel panic messagesX01 Go to Camera Issues orGo to AirPort/Bluetooth Go to SD Card NotNo Video Symptoms Quick Check No VideoGo to Backlight Issue/No Go to Won’t Start UpM03 Diagnostic LEDs on edgeLocate diagnostic LEDs on L03Corrupted Video Symptoms Quick Check Corrupted VideoIf issue cannot be seen in the screenshot then Video drivers, software, or video/logic boardM04 Disconnect DisplayPort cable Yes Replace DisplayPort cable Utility Diagnostic and enterResolved with replacement LCD panel Cable and go to stepSymptoms Quick Check Burnt Smell/Odor Burnt Smell/OdorNo Power, Dead Unit symptom flow Uncategorized SymptomsSmfeedback2@apple.com Backlight Issue/No Backlight Symptoms Quick Check Backlight Issue/No BacklightLogic board and LCD panel Panel. Run Apple Service Display Utility to verifyPanel with correct backlight DisplayDisplay Backlight Issue / No Backlight Symptoms Quick Check Noise / Unstable FlickeringNoise / Unstable Flickering Run Apple Service Display Utility to verify the resolutionSymptom flow Issue resolved When adjusting brightness levelTo Noise/Hum/Vibration LCD Image Issues Lines Go to pixel anomaliesGo to vertical/horizontal Go to non-uniformSymptoms Quick Check Incorrect/Missing Colors Incorrect/Missing ColorsYes Replace LCD panel. Run L02Boot from install DVD to determine if a potential Symptoms Quick Check Distorted/Blurred ImageClean outside of glass panel Software issue existsReinstalling internal DisplayPort Pixel Anomalies L08 Do not replace LCD panelNoise / Unstable Flickering Symptoms Quick Check Vertical/Horizontal LinesVertical/Horizontal Lines M24Issue resolved. If video card Service Display Utility toL04 Service Display Utility. To Symptoms Quick Check Non-Uniform Brightness/ColorNon-Uniform Brightness / Color Cosmetic Defects Symptoms Quick Check Cosmetic Defects to LCDCracked glass panel Error codes, symbols Symptoms Quick Check Drive Not RecognizedDrive No Boot Hard Drive Not RecognizedLogic board Reboot computer. Verify if Yes Check that the 4 wire Sata Yes Replace any damaged SataPower cable carrying 12v System boots successfully To userHard Drive Read/Write Errors Go to Optical Drive ReadIf computer starts up Mac OS without errorsH04 H03Hard Drive Noisy Symptoms Quick Check Hard Drive NoisyHum/Vibration symptom Refer to Kbase article TS3204 EvaluatingHard drive H06Go to Fan Failures/Thermal Symptoms Quick Check Drive Not Recognized/Mount Optical Drive Not RecognizedOptical Drive Won’t Accept/Eject Media Symptoms Quick Check Drive Won’t Accept MediaNot Recognized symptom flow Drive Won’t Eject MediaSymptoms Quick Check Drive Read/Write Data Error Optical Drive Read/Write ErrorJ03 Issue resolved CD and DVD media. Verify if Replace optical drive Install known-good opticalDrive SATA+Power cable Diagnostics, replace optical DriveSpecifications Optical Drive Not Performing to SpecificationsSymptoms Quick Check Optical Drive Not Performing to Same type to rule out media issueRunning diagnostics, replace Optical driveTest optical drive with different Symptoms Quick Check Optical Drive Noisy J04Optical Drive Noisy Compare system with similarVerify if known-good SD card SD Card Will Not Insert Into SlotSeat into slot Media Cards MMC Tighten SD reader board Now fits in slot Screws. Go to stepSymptom Quick Check SD Card Not Recognized SD Card Not RecognizedCorrectly read and written KBase #HT1365 AirPort Potential source AirPort/Bluetooth IssuesIssue. See kBase #HT1365 Airport potential InterferenceHtml?path=AirPort/5.0/en N04M11 Bluetooth issues are resolvedDiscoverable mode. Verify if Symptoms Quick Check AirPort Card Kernel Panic AirPort Card Kernel PanicEthernet Port/Device Issue Symptoms Quick Check Ethernet Port/Device IssueTroubleshooting purposes Wireless Input Device Does Not PairKBase #HT2532 Mac OS How to change the MTU for Html?path=Mac/10.6Go to Wireless Input Device Loses Connection symptomVerify System Preferences/Network settings Connector is damagedGo to Wireless Input Device Loses Connection symptom Go to step With customer’s mouse YesSymptoms Quick Check Apple Remote Inoperable Apple Remote InoperableThat computer now Yes Lens blocked or sensor notResponds to Apple Remote Audio Microphone Symptoms Quick Check Audio MicrophoneM09 L14 Inspect microphone cable Yes Replace rear housingAudio Built-in Speakers Have Distorted Sound Is normal during playbackAudio No Audio from Built-in Speakers Symptoms Quick CheckSee kBase #TS1574 Troubleshooting issues AudioBoard Go to System Preferences Device, replace audio cableOutput and verify that Internal Go to step Quality is acceptable Set speaker balance 100%Persists, verify if symptom has Camera Issues Symptoms Quick Check Camera IssuesUnplug all FireWire devices FireWire Device Not RecognizedFor external FireWire drives, make sure any Mode. Verify if FireWire deviceSoftware on User account. Issue Symptoms Quick Check USB Device Not Recognized USB Device Not RecognizedBluetooth not recognized M15Function Properly Wired Keyboard Does Not Function ProperlySymptoms Quick Check Wired Keyboard Does Not Go to Keyboard Specific Keys Do Not RespondGo to Optical Drive Won’t Accept/Eject MediaInput Device Doesn’t Pair symptom flow to Wired Keyboard/Mouse Not RecognizedKeyboard Specific Keys Do Not Respond Go to USB Device Not Clean your Mighty MouseTroubleshooting Mighty Mouse and determining Not Function ProperlyPair with computer Not charge batteries Not charge batteries Symptoms Quick Check Apple Wireless Mouse/Magic Apple Wireless Mouse/Magic Trackpad Erratic TrackingTrackpad erratic tracking Wireless Input Device Loses Connection K08 P01 Apple Battery Charger Does Not Charge BatteriesCharge Batteries P10Vary from 80% to almost full Was installed in chargerSoftware is installed and up-to-date, and that Device is supported with user’s systemUnstable Flickering symptom flow Symptoms Quick Check Noise/Hum/VibrationStand/Hinge Issues symptom flow Noise/Hum/VibrationGo to Audio Built-in Speakers Have Distorted Location table in GeneralGo to Optical Drive Noisy Board. Go to Noise/UnstableBeing used When working around an Energized system From fan housingReinstall fans while carefully Yes P04Verify that vents on bottom and back of system Fan Failures / Thermal IssuesSymptoms Quick Check Fan Failures / Thermal Issues System feels very hotX23 Stand/Hinge IssuesSymptoms Quick Check Stand/Hinge Issues Manuals available at http//support.apple.comVerify if damage caused by user environment Symptoms Quick Check Physical DamagePhysical Damage Broken glass Service Source Take Apart Required Tools General InformationOpening the Unit KBase #HT3452 Hand Tools for Desktop and Portable RepairsCleaning Tools Starter Kit Required Special Tools for Glass PanelCleaning & Handling the Glass Panel Do’s and Don’tsHow to Remove a Broken Glass Panel Handling a Broken Glass PanelIMac 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 Logic Board Handling Reassembly StepsScrew Sizes Tools Access DoorFirst Steps ESD mat and wrist strap Phillips #2 screwdriverRemoval Remove Access doorMemory ESD mat and wrist strapReassembly Shut down unit Unplug all cables Put on ESD strap Glass PanelMicrofoam bag Removal Reassembly Set unit in upright position to minimize settling of dust IMac 27-inch, Mid 2010 Take Apart Glass Panel Camera Glass panelRemoval Reassembly LCD Panel Reassembly Note Remove 8 T10 screwsIMac 27-inch, Mid 2010 Take Apart LCD Panel Pull display forward slightly to disconnect Important Panel Handling information Replacement LCD panel includes Vsync cable Mylar tape Aluminum tapeHandling the Panel Important Handle LCD panel by the edges onlyConnect the DisplayPort cable IMac 27-inch, Mid 2010 Take Apart LCD Panel IMac 27-inch, Mid 2010 Take Apart LCD Panel Vertical Sync Cable Vsync Pull cable straight out of connectorGlass panel LCD panel Peel black insulator to access cable LED Temp Sensor CableDisplayPort Cable No tools are required for this procedurePeel back mylar tape securing cable to LCD panel IMac 27-inch, Mid 2010 Take Apart DisplayPort Cable Audio Ports and Cable Torx T10 screwdriver ESD mat and wrist strapAlso help keep audio cable aligned while tightening screws AirPort Antenna Magnetized Torx T8 screwdriver ESD-wrist strap and matDisconnect antenna cable from AirPort card AirPort Card Magnetized Torx T6 screwdriver ESD-wrist strap and matRemove 1 T6 screw 922-8579 Hold card by edges and pull it out of the slotGlass panel LCD panel AirPort card AirPort Carrier BoardMagnetized Torx T10 screwdriver ESD-wrist strap and mat Disconnect Airport data cable Remove 2 T10 screws 922-6850 Glass panel LCD panel AirPort carrier board AirPort CableTools ESD-wrist strap and matt Black stick Removal Bluetooth Antenna Disconnect Bluetooth antenna from the Bluetooth card Bluetooth Board Removal LED Backlight Board Removal Power Supply VoltageRemove 4 T10 screws Self-tapping, 922- 6850, short S Longer self-tapping 922- 9593, long LRoute AC power inlet cable over power supply pressure wall Glass panel LCD panel Power supply Backlight Pressure WallLift 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 Hard Drive Sensor Cable Glass panel LCD panel Hard driveEach hard drive manufacturer has a unique sensor cable Optical Drive Torx T10 screwdriver ESD-wrist strap and matRemoval IMac 27-inch, Mid 2010 Take Apart Optical Drive Reassembly Replace screws in order shown Glass panel LCD panel Optical drive Optical Sensor CableTools ESD-wrist strap and mat Peel up foam gasket to release sensor end of cable Optical Drive Fan Remove 1 T10 screw 922-9236 EEE code SD Card ReaderTorx T8 screwdriver ESD-wrist strap and mat Black stick Removal Reassembly SD Card Reader Cable Glass panel LCD panel Optical drive Optical drive fanIMac 27-inch, Mid 2010 Take Apart SD Card Reader Cable IR Board and Cable ESD-wrist strap and mat Black stickRemoval Logic Board Transfer this jumper if replacing the logic boardPower button CPU fan Skin temp sensor 922-6800, 2 short 922-9237, 2 20mm, medium Carefully lift board up and out of rear housing Handling Logic BoardReassembly 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 Solid State Drive SSD Torx T8 screwdriver Black stick ESD-wrist strap and matRemoval Use a black stick to pry pressure wall off rear housing Lift pressure wall and SSD drive from rear housingReassembly 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 Replacement Note Disconnect optical data cable from back side of logic boardBattery Black stick ESD mat and wrist strapMake 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 Ambient Temp Sensor Black stick ESD-wrist strap and matRelease 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 Mechanism Cover ESD-wrist strap and mat Magnetized Torx T10 screwdriver922-6800 Peel up aluminum tapePry cover off mechanism Stand No preliminary steps are required to remove the standRemove 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 Glass panel LCD panel Camera Hard drive Power supply Camera CableDisconnect camera cable #5 from the top of logic board IMac 27-inch, Mid 2010 Take Apart Camera Cable Cable, AC/DC Power/Backlight SataRemoval SATA, SSD Disconnect SSD drive power cable from top of SSD drive 2010-09-09 Refer to the rear housing procedure Microphone CableRear 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 Retrieving Mechanism OverviewRemoval 2010-09-09 2010-09-09  Service Source Views Exploded Views Exploded View #1Exploded View #2 Exploded View #3 External Views Rear ViewPorts Internal Views Photo of Components below LCDPhoto of Components in the Rear Housing Logic Board, Front Side Logic Board, Back Side 922-9247 922-8579 922-6850 Screw Chart922-9246 922-9239 922-4723 922-9244 922-9593 922-9241922-8174 922-9488 922-7018 922-9236 922-6800 922-9237922-9243 922-9242 922-9238 922-7971