Functional Overview

Refer to this diagram for symptoms related to logic board connectors. To rotate this page in Preview for easier viewing, go to Tools menu and choose “Rotate Left”.

Hard Drive (and SSD) SATA data:Right Speaker - no boot from bootable HD (or SSD)- no sound from - no HD (or SSD) visible on SATA busright speaker - Optical Drive SATA data+ Power:- distorted right - no boot from ODD drivesound -no ODD seen on SATA bus - ODD drive does not inject /eject any media

Ram: -noboot, -beeptonesonstartup, -freezes,orkernelpanics

PowerOnButton: -noPowerOn(unlessshortingthe padsonlogicboard)

CPUFan: -systemfreezesorkernelpanicif CPUgetsoverheating -reducedperformanceorsystem sleepifCPUtemperaturegets toohighduetodisconnnected blockedfan

IRReceiver: -noIRRemotefunctionality

CPUTemperatureSensor: -fanrunningathigherspeed,-reducedperformanceorsystem sleepifCPUtemperaturegetstoo high

BackupBattery: -novideo-beepsequenceonstartup

toosleep--Sensor:Skin highreducedfan ifrunning(Enclosure)Temperature enclosureperformanceat temperatureorhigher speed getssystem

modelmatchingdis/misconnected,speed-Sensor:Hardiffan runningDrive drivesensor brand/atTemperature orcablehigher notis

LeftSpeaker: -nosoundfrom speaker -distortedleft sound

 

 

 

 

 

 

 

left

 

 

 

 

 

 

 

PowerSupply+BacklightControl+ PowerSupplyTempsensor: -noPower,noVideo-no/poorbacklightcontrol,-fanrunningathigherspeed-reducedperformanceorsystemsleep powersupplytemperaturegetstoohigh

 

 

 

 

 

 

 

if

 

 

 

 

 

 

 

OpticalDriveFan: -ODDtemperature gettingtoohigh -mediaread/burning failsiffan disconnectedor blocked

 

 

 

 

 

 

 

OpticalDriveTemperatureSensor: -ODDfanrunningathigherspeed-mediaread/burningfailifODD temperaturegetstoohigh

Analog/OpticalAudioIn/Out: -noAnalog/Opticalaudioinput/output-onlyOpticalPortsseeninprefs

Microphone: -nointernalmicrophoneinput

SDCardReader: -noSDcardreaderseeninSystem Profiler/USB -noSDcardread/write

MXMVideoCard: -novideooninternalLCDandon externalDisplayPortconnector

VideoCardTemperatureSensor: -fanrunningathigherspeed-videoartifacts/videofreezes-reducedperformanceorsystemsleep ifvideocardtemperaturegetstoohigh

DisplayPortLCD: -poor/novideooninternalLCD

AirPortCard: -cannotenableAirPort

-Hard disconnectedfancorruptionhard is blockeddriveDrive ifdataFan: orHD

--LEDCamera whennofunctionalityno cameracameracamera: + isLEDCamera on

Bluetooth-Bluetoothenablecannot :

getssystem--Sensor:Ambient tooreducedfan highsleeprunning ifperformanceatTemperature temperaturehigher orspeed

LCD Temperature Sensor: - fan running at higher speed - reduced performance or system sleep if LCD temperature gets too high

2010-09-09

iMac (27-inch, Mid 2010) — General Troubleshooting 33

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Image 33
Apple MD094LL/A manual Functional Overview