Apple imac 24 early 09 Service Manual
Apple Technician Guide
iMac (24-inch, Early 2009)
2009-03-03
Apple Inc.
© 2009 Apple Inc. All rights reserved.
Under the copyright laws, this document may not be copied, in whole or in part, without the
written consent of Apple.
Every eort has been made to ensure that the information in this document is accurate. Apple
is not responsible for printing or clerical errors.
Apple
1 Innite Loop
Cupertino, CA 95014-2084
USA
+ 1 408 996 1010
www.apple.com
Apple, the Apple logo, Mac, and Macintosh are trademarks of Apple Inc., registered in the U.S.
and other countries.
iMac (24-inch, Early 2009)
Contents
Manual Updates 8
Basics
Overview 10
Product Features 10
Product Congurations 11
Safety Precautions 12
Serial Number Location 13
Troubleshooting
General Troubleshooting 15
Diagnostic LEDs 15
Sensor and Fan Connector Locations 18
Troubleshooting Theory 19
Hardware vs. Software 19
Power On Self Test (POST) 19
Firmware Updates 19
How to Reset the System Management Controller (SMC) 20
To reset the SMC on an iMac 20
Block Diagram 21
Symptom Charts 22
Startup and Power 22
No Power, Dead Unit 22
Won’t Start Up 24
Intermittent Shutdown 26
Kernel Panic, System Crashes 28
No Video 30
Corrupted Video 32
Burnt Smell/Odor 34
Uncategorized Symptoms 35
Display 36
Backlight Issue/No Backlight 36
Noise / Unstable Flickering 39
LCD Image Issues 42
Incorrect/Missing Colors 43
Distorted/Blurred Image 44
Pixel Anomalies 47
Vertical/Horizontal Lines 48
Non-Uniform Brightness 50
Cosmetic Defects 51
Uncategorized Symptoms 51
Mass Storage 52
Hard Drive Not Recognized 52
Hard Drive Read/Write Error 54
Hard Drive Noisy 55
Optical Drive Not Recognized 57
Optical Drive Won’t Accept/Eject Media 58
Optical Drive Read/Write Error 60
Optical Drive Not Performing to Specications 61
Optical Drive Noisy 62
Uncategorized Symptoms 64
Communications 65
AirPort/Bluetooth Issues 65
AirPort Card Kernel Panic 67
Ethernet Port/Device Issue 68
Wireless Input Device Doesn’t Pair 69
Wireless Input Device Loses Connection 71
Uncategorized Symptoms 73
Input/Output Devices 74
Apple Remote Inoperable 74
Audio: Microphone 76
Audio: Built-in Speakers Have Distorted Sound 77
Audio: Built-in Speakers Have No Audio 79
Camera Issues 81
FireWire Devices Not Recognized 82
USB Devices Not Recognized 84
Wired Keyboard Does Not Function Properly 86
Keyboard: Specic Keys Do Not Respond 88
Wired Keyboard/Mouse Not Recognized 88
Uncategorized Symptoms 90
Mechanical 91
Noise/Hum/Vibration 91
System Runs Hot 94
Stand/Hinge Issues 95
Physical Damage 96
Uncategorized Symptoms 96
Take Apart
General Information 98
General Tools 98
Opening the Unit 98
Required Special Tools for Glass Panel 98
Cleaning Tools Starter Kit 99
Cleaning Tool Resources 99
Cleaning & Handling the Glass Panel 100
Do’s and Don’ts 100
Handling a Broken Glass Panel 100
Safety 101
Logic Board Handling 102
Serial Number Location 103
Reassembly Steps 103
Screw Sizes 103
Access Door 104
Memory 106
Removal 107
Reassembly 107
Glass Panel 108
Removal 109
Reassembly 110
Front Bezel 114
Removal 115
Reassembly 117
Camera 118
Battery 120
Removal 121
Reassembly 121
IR Board 122
AirPort Extreme Card 124
Bluetooth Board 126
LCD Display Panel 128
Ambient Temp Sensor 132
Left Speaker 134
LVDS Display Cable 136
Right Speaker 138
Inverter Cable 140
Optical Drive Fan 142
CPU Fan 144
Power Supply 146
Hard Drive 149
Removal 150
Reassembly 152
Hard Drive Sensor Cable 154
Optical Drive 156
Optical Data Cable 159
Optical Sensor Cable 161
Logic Board 163
Removal 164
Reassembly 166
Handling Logic Boards 167
Video Card 168
Hard Drive Fan 171
Audio Board 173
Hard Drive Data Cable 175
Mechanism Cover 177
Stand 179
Removal 180
Reassembly 181
Mechanism 183
Chassis 185
Camera Cable 187
Microphone Cable 189
Cable, DC,Power Supply/SATA 191
Rear Housing 194
Views
Exploded View 197
Screw Chart 199
Internal Views 202
I/O Ports 204
Manual Updates
Manual introduced 3 March 2009.
2009-03-03
iMac (24-inch, Early 2009) Basics — Manual Updates 8
Apple Technician Guide
Basics
iMac (24-inch, Early 2009)
© 2008 Apple Inc. All rights reserved.
Overview
2009-03-03
Product Features
The iMac (24-inch, Early 2009) computer features include:
Increased processor speeds: 2.66, 2.93, 3.06GHz•
Ultrafast NVIDIA graphics•
Mini DisplayPort•
Four USB 2.0 ports•
One FireWire 800 port•
Increased hard drive capacity: 64• 0/1TB
Double the memory, 4GB of memory standard•
iMac (24-inch, Early 2009) Basics — Overview 10
Product Congurations
To conrm the conguration from the Apple menu, choose About This Mac. The processor
listing will show the speed of the processor followed by the processor type.
The following table shows the iMac (24-inch, Early 2009) model congurations at introduction:
Feature Better Best Ultimate
Intel Intel Core 2
Duo processor
Memory 4GB (2 x 2GB SO-DIMMs) 1066 MHz DDR3 (CTO: Up to 8GB)
Hard Drive, Serial
ATA
Optical Drive 8x SATA SuperDrive
Display 24” wide 1920 x 1200 94.1 ppi:IPS 400 nits, 14 lamps, glossy
2.66 GHz, 1066MHz frontside bus, 6MB
shared L2 cache
640GB , 7200 rpm, (CTO: Up to 1TB) 1TB (7200 rpm
2.93GHz/3.06
GHz (CTO)
3.06GHz
Graphics NVIDIA GeForce 9400M with 256MB of
shared DDR3 memory
Audio I/O Combo digital/analog in, Combo digital/heaphone out, Mic, Stereo
speakers, 4 channel audio
Wireless Mini PCIe 802.11a/b/g/n, Bluetooth 2.1
Input Devices Wired mouse, no remote, no modem Wired keyboard
I/O Four USB 2.0 ports, two USB 2.0 ports on keyboard, one FW 800, Mini
DisplayPort
Video I/O Built-in iSight camera, MiniDisplayPort output for DVI, dual-link DVI, and
VGA video (requires adapters, sold separately)
Power Supply 250W universal supply
NVIDIA GeForce
GT 120 with
256MB of
GDDR3 memory,
(CTO: NVDIA
GeForce GT 130
or ATI Radeon
HD 4850 with
512MB of GDDR3
memory)
and mouse,
wireless (CTO)
NVIDIA
GeForce GT
130 with
512MB of
GDDR3
memory,
(CTO: ATI
Radeon
HD 4850
with 512MB
of GDDR3
memory)
Wireless
keyboard
and mouse
2009-03-03
iMac (24-inch, Early 2009) Basics — Overview 11
Safety Precautions
Warning: HIGH VOLTAGE: The AC/DC power supply PCB remains powered up whenever the
system is plugged in, whether or not the system has been turned on. Use extreme caution
when troubleshooting the system with the front bezel removed.
WARNING: If the computer is shut down by removing the power cord, allow the power supply
a good 2-3 minutes to discharge the capacitors before handling it. However, if you select “Shut
Down” via the Apple menu, the computer will discharge the power supply capacitor almost
immediately.
2009-03-03
iMac (24-inch, Early 2009) Basics — Overview 12
Serial Number Location
The iMac (24-inch, Early 2009) serial number is located on the base of the stand. When
replacing a stand, transfer the serial number to the new stand.
2009-03-03
iMac (24-inch, Early 2009) Basics — Overview 13
Apple Technician Guide
Troubleshooting
iMac (24-inch, Early 2009)
© 2008 Apple Inc. All rights reserved.
General Troubleshooting
Diagnostic LEDs
Depending on the iMac model, it has either three or four built-in diagnostic LEDs on the main
logic board that can help you to troubleshoot the computer. The LEDs are located to the right
of the battery. Refer to the next two pages for close-up pictures of the troubleshooting LEDs.
2009-03-03
iMac (24-inch, Early 2009) — General Troubleshooting 15
LED #1
Indicates that the trickle voltage from the power supply has been detected by the main •
logic board. This LED will remain ON whenever the iMac is connected to a working AC
power source. The LED will remain on even when the computer has been shut down or
put to sleep. The LED will turn o only if the AC power source is disconnected or the power
supply is faulty.
LED #2
Indicates that the main logic board has detected proper power from the power supply •
when the computer is turned on. This LED will be ON when the computer is turned on and
the power supply is working correctly.
LED #3
Indicates that the computer and the video card are communicating. This LED will be ON •
when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON
and you heard the startup sound, but LED 3 is OFF, then the video card might be installed
incorrectly or need replacement. Note: this LED is not used on systems with the integrated
graphics.
2009-03-03
iMac (24-inch, Early 2009) — General Troubleshooting 16
LED #4
Indicates that the computer and the LCD display panel are communicating. This LED will be •
ON when the computer is turned on and video signal is being generated. If the LED is ON
and there is no image on the LCD display panel, the LCD display panel or inverter might be
installed incorrectly or need replacement.
2009-03-03
iMac (24-inch, Early 2009) — General Troubleshooting 17
Sensor and Fan Connector Locations
Ambient temp sensor and fan connector locations are shown below. Ensure cables are correctly
routed and the sensors and fans are properly connected. If a sensor or fan is faulty or not
connected, Apple Hardware Test will generate an error code.
2009-03-03
iMac (24-inch, Early 2009) — General Troubleshooting 18
Troubleshooting Theory
For a review of basic troubleshooting theory, refer to:
http://service.info.apple.com/service_training/en/006/troubleshoot/
Hardware vs. Software
For information on how to isolate a hardware issue from a software issue, refer to the following
Apple Knowledge Base article:
kBase #TS1388: Isolating issues in Mac OS X
For information on how to troubleshoot a software issue, refer to the following Apple
Knowledge Base article:
kBase #HT1199: Mac OS X: How to troubleshoot a software issue
Power On Self Test (POST)
Intel-based Mac computers such as the iMac rely on a combination of tones and blinking LEDs
to display Power On Self Test (POST) error codes.
If the computer detects out-of-specication or no SDRAM or the RAM installed does not •
meet the appropriate specications, the screen will remain black but the computer will
beep This error condition may be due to physically damaged RAM, installing the incorrect
type of RAM, or not having RAM installed.
Some RAM may appear to pass the Power-On-Self-Test (POST) but still cannot be used by •
the operating system. In this case, the computer will display a gray screen, sound three
tones and repeat the tones until the computer is turned o.
The solution to both of these situations is to rst re-seat the memory and test the computer •
again. If the memory fails the POST test again, try memory that has been veried to work
correctly on another system (i.e., “known-good”) or order new memory.
2009-03-03
Firmware Updates
Firmware is the name given to software that is written into memory circuits such as ash
memory, that will hold the software code indenitely, even when power is removed from the
hardware. Firmware on Intel Mac computers is designed to be updated if necessary through a
software update.
Information about rmware versions for Intel Macs can be found in Knowledge Base article
303880 Mac OS X: Firmware Updates for Intel-based Macs.
iMac (24-inch, Early 2009) — General Troubleshooting 19
How to Reset the System Management Controller (SMC)
The System Management Controller (SMC) is a chip on the logic board that controls all power
functions for your computer. If your computer is experiencing any power issue, resetting the
SMC may resolve it. The SMC controls several functions, including:
Telling the computer when to turn on, turn o, sleep, wake, idle, and so forth.•
Handling system resets from various commands.•
Controlling the fans.•
Note that resetting the SMC does not reset the PRAM. Resetting the SMC will not resolve issues
in which your computer is unresponsive—in these situations, restarting your computer will
generally suce. If your computer isn’t responding, perform these steps one at a time, in this
order, until the issue has been resolved:
Force Quit (Option-Command-Escape).1.
Restart (Control-Command-Power).2.
Force Shut Down (press the power button for 10 seconds).3.
Resetting the SMC can resolve some computer issues such as not starting up, not displaying
video, sleep issues, fan noise issues, and so forth. If your computer still exhibits these types of
issues after you’ve restarted the computer, try resetting the SMC.
To reset the SMC on an iMac
From the Apple menu, choose Shut Down (or if the computer is not responding, hold the 1.
power button for approximately ten seconds until it powers o).
Unplug all cables from the computer, including the power cord.2.
Wait at least 15 seconds. The SMC reset occurs automatically once the iMac has been 3.
unplugged from the AC power source for several seconds.
Plug the power cord back in, making sure the power button is not being pressed at the 4.
time.
Reconnect your keyboard and mouse to the computer.5.
Press the power button on the back to start up your computer.6.
Note: The iMac does not have a button on the main logic board for resetting the SMC, which
eliminates the need to remove the computer’s cover to reset it (as required for some other
models).
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iMac (24-inch, Early 2009) — General Troubleshooting 20
MLB
MXM
(optional in 24”)
Temperature
Sensor
(if MXM present)
Ambient
Temperature
Sensor
802.11n
Antenna
Bluetooth
Antenna
Display
Temperature
Sensor
AC/DC
Temperature
Sensor
Hard Drive
Temperature
Sensor
Optical Drive
HD Fan
ODD Fan
CPU Fan
SO-DIMM SO-DIMM
Speaker
Speaker
IR Sensor
Audio Board
Power Button
AC Inlet
Camera
Microphone
Inverter
Temperature
Sensor
PCIe x1
DDR3-1066 DDR3-1066
USB 2.0USB 2.0
USB 2.0
SATA II
SATA II
24V
Antenna
Block Diagram
Refer to this diagram to see how modules are interrelated.
2009-03-03
iMac (24-inch, Early 2009) — General Troubleshooting 21
Symptom Charts
Follow the steps in the order indicated below. If an action resolves the issue, retest the system
to verify.
Startup and Power
No Power, Dead Unit
Unlikely cause: speakers
Quick Check
Symptoms Quick Check
No Power, Dead Unit
No power•
No fan spin•
No startup chime•
No image on external display•
No hard drive or optical drive •
activity
Caps Lock LED on wired •
keyboard doesn’t light when
pressed.
Verify power source.1.
Verify power cable.2.
Listen closely for signs of activity from system 3.
including: rotating fans, hard drive or optical drive
activity, startup chime, etc.
Deep Dive
Check Result Action Code
Power ON system. Verify if 1.
there is any indication that the
system has powered up (fan
rotation, hard drive or optical
drive noise, backlight turns on).
Yes The symptom is powering
up. Jump to Won’t Start Up
symptom ow.
No Go to step 2.
2009-03-03
iMac (24-inch, Early 2009) Symptom Charts — Startup and Power 22
Remove front bezel and locate 2.
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.
Press power button while 3.
monitoring diagnostic LED’s.
Does diagnostic LED #2 turn
ON and remain ON after
pressing the power button?
Disconnect power then remove 4.
power supply and carefully
inspect AC inlet and DC output
connectors and cables for
damage or poor connections.
Were any problems identied?
Inspect power button and 5.
verify that it is properly
connected to the logic board.
Disconnect power button 6.
from logic board and verify
continuity between two pins
when power button is pressed.
Yes Power supply functioning and
logic board detects supply
voltages. Jump to Won’t Start
Up symptom ow.
No Go to step 5.
Yes Replace damaged part. P16
No Go to step 5.
Yes Visual inspection OK.
Go to step 6.
No Reconnect power button.
X14
Replace rear housing (which
includes power button) or
logic board if damage is
present.
Yes Power button is functioning
correctly. Go to step 6.
No Power button faulty. Replace
X16
rear housing which includes
power button.
2009-03-03
Press power button and verify 7.
whether system turns ON.
Yes Power supply is functioning.
If system still does not boot
jump to Won’t Start Up
symptom ow.
No Replace power supply. Retest. P01
Note: If No Power symptom persists after all steps have been followed use Minimum
Conguration 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 (24-inch, Early 2009) Symptom Charts — Startup and Power 23
Won’t Start Up
Quick Check
Symptoms Quick 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.
Isolate OS by starting up from original install 1.
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.
Reset SMC and PRAM to clear any stored, 2.
corrupted information.
Start up in Safe Mode by holding the shift key 3.
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
If system generates error tones there may be an 4.
issue with the SDRAM. See KBase article
http://support.apple.com/kb/HT2341
Identifying when in the startup process the 5.
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.
2009-03-03
Deep Dive
Check Result Action Code
Boot the computer to Apple 1.
Hardware Test on the Install
DVD. Does the computer boot
up to this volume?
Remove the installed SDRAM, 2.
and test with known-good
SDRAM. Does the computer
startup properly now?
iMac (24-inch, Early 2009) Symptom Charts — Startup and Power 24
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.
Yes SDRAM issue. Replace SDRAM.
Issue resolved.
No Go to step 3.
X02
Remove the coin battery on 3.
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?
Yes Issue 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.
Remove AirPort card and test. 4.
Does the computer startup
properly now?
Disconnect the hard drive SATA 5.
cable and startup to the Install
DVD on the optical drive, or
an external volume. Does the
computer startup properly
now?
Disconnect the optical drive 6.
and test. Does the computer
start without kernel panic now?
Yes Go to AirPort Card Kernel
Panic symptom ow.
No Go to step 5.
Yes Go to Hard Drive Not
Recognized symptom ow.
No Go to step 6.
Yes Go to Optical Drive Not
Recognized symptom ow.
No Replace logic board. M02
2009-03-03
iMac (24-inch, Early 2009) Symptom Charts — Startup and Power 25
Intermittent Shutdown
Quick Check
Symptoms Quick Check
Intermittent Shutdown
Powers o during startup.•
Powers o during desktop use.•
Computer restarts •
spontaneously.
Powers o when waking from •
sleep.
Isolate OS by starting up from original Install 1.
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.
Reset SMC and PRAM to clear any stored, 2.
corrupted information.
Start up in Safe Mode by holding the shift key 3.
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
Open System Preferences > Energy Saver > 4.
Schedule and make sure that a ‘Shut Down’ event
is not scheduled.
Make sure that power cord is securely attached to 5.
the back of the computer, and is not hindered by
a desk or other furniture.
Plug the computer directly into an AC outlet to 6.
test whether a surge protector, outlet strip, or UPS
is causing the issue.
2009-03-03
Deep Dive
Check Result Action Code
Verify improper shutdown 1.
by opening the system.log
located in /var/log. Filter the
log for “shutdown cause”. Entries
of value “0” or a negative
value indicate an improper
shutdown. Did you nd entries
of improper shutdown?
iMac (24-inch, Early 2009) Symptom Charts — Startup and Power 26
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
ow. No repair needed under
current symptom ow.
With known-good AC power 2.
cord and AC outlet, does the
unit continue to shutdown?
Yes Go to step 3.
No AC power cord / outlet issue.
Issue resolved.
X03
Disconnect the hard drive 3.
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?
Inspect and reseat DC power 4.
cable and AC inlet connections
to power supply and logic
board. Was damage observed
on the cables or connectors.
Install known-good power 5.
supply. Does system continue
to restart or shutdown?
After logic board replacement. 6.
does the computer continue to
shutdown?
Yes Go to step 4.
No Possible bad software or hard
drive. Go to Hard Drive Not
Recognized symptom ow.
Yes Replace damaged cable.
Retest. Return to step 1 if
problem continues.
No Go to step 5.
Yes Reinstall original power
supply. Replace logic board.
Go to step 6.
No Power supply issue.
Issue resolved.
Yes Use Minimum Conguration
troubleshooting to isolate
failed module.
X03
P02
2009-03-03
No Logic board issue.
M08
Issue resolved.
iMac (24-inch, Early 2009) Symptom Charts — Startup and Power 27
Kernel Panic, System Crashes
Quick Check
Symptoms Quick Check
Kernel Panic, System Crashes
Kernel Panic on startup or •
desktop use.
System freeze during use.•
System freeze upon wake from •
sleep.
Isolate OS by starting up system from original 1.
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.
Ensure that all software and rmware updates 2.
for the computer have been installed to take
advantage of any available bug xes.
Reset SMC and PRAM to clear any stored, 3.
corrupted information.
Start up in Safe Mode by holding the shift key 4.
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
Check the panic.log, located /Library/Logs/5.
Panicreporter, for information in the backtrace
that may give clues about the kernel panic.
For more information on kernel panics refer to 6.
KBase article
http://support.apple.com/kb/HT1392
2009-03-03
Deep Dive
Check Result Action Code
Boot the machine to Apple 1.
Hardware Test on the Install
DVD. Does the computer boot
up to this volume?
Remove all peripheral devices 2.
including the keyboard and
mouse. Does computer start
without kernel panic?
iMac (24-inch, Early 2009) Symptom Charts — Startup and Power 28
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.
Yes Add peripheral devices one at
a time until the kernel panic
repeats. Replace the device
causing the issue.
No Go to step 3.
Use known-good SDRAM in 3.
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.
No Go to step 4.
X01
Remove AirPort card and 4.
test. Does the computer start
without kernel panic now?
Disconnect the hard drive SATA 5.
cable and startup to the Install
DVD on the optical drive, or
an external volume. Does the
computer start without kernel
panic now?
Disconnect the camera/6.
microphone cable. Does the
computer start without kernel
panic now?
Disconnect the audio board 7.
and test. Does the computer
start without kernel panic now?
Disconnect the optical drive 8.
and test. Does the computer
start without kernel panic now?
Yes Go to AirPort Card Kernel
Panic symptom ow.
No Go to step 5.
Yes Go to Hard Drive Not
Recognized symptom ow.
No Go to step 6
Yes Go to Defective Camera
symptom ow.
No Go to step 7.
Yes Replace audio board. X99
No Go to step 8.
Yes Go to Optical Disc Drive Not
Recognized symptom ow
No Replace logic board.
2009-03-03
iMac (24-inch, Early 2009) Symptom Charts — Startup and Power 29
No Video
Unlikely cause: hard drive, optical drive, speakers, camera, microphone
Quick Check
Symptoms Quick Check
No Video
No image.•
Backlight failure.•
Check brightness setting.1.
For no-video issues, connect an external 2.
display to verify whether iMac video circuitry is
functioning. If image appears on external display
go to Backlight Issue/No Backlight symptom ow.
Reset SMC.3.
Deep Dive
Check Result Action Code
Verify boot chime present and 1.
fans running when system
powered ON. (Reset SMC and
clear PRAM if necessary for
proper boot up.)
Verify whether image is visible 2.
on LCD panel.
Yes Power ON self test OK. Boot
sequence started.
Go to step 2.
No Go to Won’t Start Up
symptom ow.
Yes Video present. Verify system
functionality and return to
user or jump to appropriate
troubleshooting ow.
2009-03-03
Connect supported external 3.
display. Verify whether image
appears on external display
when system is booted.
iMac (24-inch, Early 2009) Symptom Charts — Startup and Power 30
No Go to step 3.
Yes External display detected by
system. Video circuitry on
logic board functional. Go to
No Video symptom ow.
No Go to step 4.
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