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Apple imac 20 inch mid 2009 User Manual

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Page 161

iMac (20-inch, Early/Mid 2009) Take Apart — Logic Board 161 2010-11-24
4 Lift logic board 
up and out of rear 
housing. 
 
Important: Always 
handle logic board by 
edges of circuit board 
only. Never handle 
by heatsink or metal 
frame!
Reassembly
If you removed logic 
board to access another 
module, reassembly is an 
exact reversal of the steps.
If installing a new 
replacement logic board, 
note 4 things:
1 Verify that tamper 
indicator labels on 
front and back of 
heatsink assembly 
are intact.  If...

Page 162

iMac (20-inch, Early/Mid 2009) Take Apart — Logic Board 162 2010-11-24
2 Transfer the following 
items from old logic 
board to new logic 
board:
•  memory DIMMs
•  AirPort card
For the Early 2009 
model, also transfer:
•  Bluetooth board and 
cable
•  IR board and cable
3 Replace 2 pieces 
of EMI tape onto 
I/O ports and rear 
housing as shown.  
The EMI tape is 
included in the box 
with a new logic 
board.
4 Important: Make sure 
to return old logic 
board with audio 
board attached.  

Page 163

iMac (20-inch, Early/Mid 2009) Take Apart — Logic Board 163 2010-11-24
Handling Logic 
Boards
1 
IMPORTANT: 
Always use 2 hands 
to support logic 
board and heatsink. 
Handling board 
incorrectly could flex 
board and damage 
chips and circuits.
2 Never handle board 
by heatsink.  

Page 164

iMac (20-inch, Early/Mid 2009) Take Apart — Hard Drive Fan 164 2010-11-24
First Steps
Remove:
• Access Door
•  Glass Panel
•  Front Bezel
•  LCD Panel
•  Right Speaker
•  Logic Board
Tools
• ESD wrist strap
Hard Drive Fan  

Page 165

iMac (20-inch, Early/Mid 2009) Take Apart — Hard Drive Fan 165 2010-11-24
Removal
1 
Lift fan straight 
up and off the 3 
guideposts.
Note:  Image at right 
shows a map of 
connectors on top of 
logic board.  Hard drive 
fan cable connects to the 
furthest right of the 3 
connectors.
Hard drive sensor has a 
3-pin connector.  Optical 
drive sensor has a 2-pin 
connector.  Hard drive fan 
has a 4-pin connector.  

Page 166

iMac (20-inch, Early/Mid 2009) Take Apart — Hard Drive Data Cable 166 2010-11-24
First Steps
Remove:
• Access Door
•  Glass Panel
•  Front Bezel
•  LCD Panel
•  Right Speaker
•  Hard Drive
•  Logic Board
Removal
1 
Remove clear tape 
securing cable to 
chassis.
2 Lift cable out of 
computer.
Hard Drive Data Cable  

Page 167

iMac (20-inch, Early/Mid 2009) Take Apart — Mechanism Cover 167 2010-11-24
First Steps
Remove:
• Access Door
•  Glass Panel
•  Front Bezel
•  LCD Panel
•  Right Speaker
•  Logic Board
•  Hard Drive
•  Hard Drive Fan
Removal
1 
Peel up EMI tape from 
top and bottom of 
mechanism cover.
2 Lift cover off 
mechanism.
.
Mechanism Cover  

Page 168

iMac (20-inch, Early/Mid 2009) Take Apart — Stand 168 2010-11-24
First Steps
Remove:
• Access Door
•  Glass Panel
•  Front Bezel
•  LCD Panel
•  Right Speaker
•  Logic Board
•  Hard Driv e
•  Hard Drive Fan
•  Mechanism Cover
Tools
• ESD wrist strap
•  Torx T10 screwdriver
Stand  

Page 169

iMac (20-inch, Early/Mid 2009) Take Apart — Stand 169 2010-11-24
Removal
1 
Remove T10 screws: 
(7) 922-8209
2 Lift stand off 2 pins on 
mechanism.
3 Carefully separate 
stand from mechanism 
and rear housing.
Replacement Note: 
If installing a new 
replacement stand, 
transfer U-shaped black 
plastic piece with serial 
number to new stand.  

Page 170

iMac (20-inch, Early/Mid 2009) Take Apart — Mechanism 170 2010-11-24
First Steps
Remove:
• Access Door
•  Glass Panel
•  Front Bezel
•  LCD Panel
•  Right Speaker
•  Logic Board
•  Hard Drive
•  Hard Drive Fan
•  Mechanism Cover
•  Stand
Tools
• ESD wrist strap
•  Torx T10 screwdriver
Mechanism  
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