Apple imac 20 inch mid 2009 User Manual

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 91 2010-11-24
Required Special Tools for Glass Panel
Special tools are required to remove, handle and clean glass panel.
• 922-8252 – Suction cups, Pkg of 2
•  922-8253 – Gloves, lint-free, anti-static, Pkg of 2
•  922-8258 – ESD bags, 24”x20”, Pkg of 5.  To prevent buildup of static charges which may 
attract dust particles, store LCD panel in an ESD bag when it is removed from unit.
•  922-8259 – Microfoam bag to store glass panel, Pkg of...

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 92 2010-11-24
Cleaning & Handling the Glass Panel
Follow cleaning procedures in this manual to ensure glass panel is free of dust and other 
particles before returning the computer to customer.
• The glass panel is not tempered and will break into sharp pieces of mishandled.   
A scratched or broken glass panel is not covered under warranty.
•  Removing glass panel requires special tools such as lint-free gloves, rubber suction cups, 
and...

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 93 2010-11-24
How to Remove a Broken Glass Panel
A shattered panel can be removed using safety glasses, packing tape, and leather gloves. 
1.  Put on the safety glasses and leather gloves. 
2.  Lay the computer on a smooth, clean work surface.
3.   Peel protective covering off the front of the glass. Remove and discard any large pieces of 
broken glass.  

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 94 2010-11-24
4. Apply a strip of packing tape horizontally across the top and bottom of the glass panel. 
Next, apply the tape diagonally, across the broken glass panel, forming an “X.”
5.   Continue applying tape horizontally, thoroughly covering the broken glass. Most of the glass 
will still be attached to the steel ring that runs around the perimeter of the glass panel.  

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 95 2010-11-24
6. Use a black stick to pry the glass panel off the magnets on the rear housing.
7.  Lift the entire glass panel off the rear housing.  

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 96 2010-11-24
8. Place the broken glass inside a large box, label the box, and dispose of it properly. 
9.   Using a whisk broom, clean the work surface of tiny glass particles.
10.  Stand the iMac up and use a lint free cloth to carefully brush any of the particles off the 
iMac onto the table. Clean the work surface again.
11.  When the repair is finished the cloth should be disposed of immediately.
12.  Use a broom and dustpan to sweep up...

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 97 2010-11-24
Safety
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.  • Don’t work alone. In the event of an electrical shock it is important to have 
another individual present who can provide assistance. 
•  Keep one hand in your pocket when working on any...

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 98 2010-11-24
Logic Board Handling
IMPORTANT: Always use two hands to support the logic board and heatsink.  Handling the 
board incorrectly could flex the board and damage the chips and circuitry.
Never handle the board by the heatsink.  

iMac (20-inch, Early/Mid 2009) Take Apart — General Information 99 2010-11-24
Reassembly Steps
When there are no replacement steps listed, replace parts in the exact reverse order of the 
Removal procedure. 
Images in This Guide
Small differences in appearance between the images pictured and the actual computer you are 
servicing may exist, however the steps and sequence are the same unless otherwise noted.
Screw Sizes
All screw sizes shown are approximate and represent the total length of the screw.  

iMac (20-inch, Early/Mid 2009) Take Apart — Access Door 100 2010-11-24
First Steps
• Shut down computer.
•  Unplug all cables and 
the power cord.
•  Put on ESD strap.
•  Place computer face 
down on a clean, flat 
surface so the bottom 
is facing you.
Tools
• ESD wrist strap
•  Clean, lint-free cloth
•  Phillips #2 screwdriver
Removal
1 
Loosen captive 
Phillips #2 screw.
2 Remove access door 
(922-8186).
Access Door