Apple imac 20 inch late 2006 User Manual

iMac (20-inch Late 2006) Take Apart — General Information 11
Opening the Computer
Apple authorized, desktop certified technicians only should ever remove the front bezel on the 
iMac (20-inch Late 2006). When the front bezel is removed, be sure to always ground yourself and 
follow ESD-safe repair practices
Removing the front bezel requires using a special access card (part 922-7172) to release latches 
located inside the upper corners of the front bezel. Slightly bending the upper quarter  of the...

iMac (20-inch Late 2006) Take Apart — General Information 12
Cut the EMI gasket to the edge of the access card.
 
2.  
Using packing tape, or something equivalent, fold the tape over the EMI gasket to attach the 
3. 
gasket to the card.   

iMac (20-inch Late 2006) Take Apart — General Information 13
Bend the card at a slight angle at the top to make sure the card makes contact with each 
4.  
latch.  
Refer to 
5.  Removing the Front Bezel for the complete procedure.
6.  

iMac (20-inch Late 2006) Take Apart — General Information 14
EMI Shielding
The iMac enclosure is wrapped in EMI shielding that is easily torn and damaged. To maintain 
a properly shielded unit, you must repair all accidental tears and cracks to the shielding by 
covering them with EMI tape.  Order EMI tape, part number 922-4786 (a long, thin strip) or 922-
5026 (short, wide strips). 
 
Cover nicks with EMI tape. Pay particular attention to the EMI shielding inside the rear housing, 
shown below. The EMI...

iMac (20-inch Late 2006) Take Apart — General Information 15
Lower EMI Shield
EMI tape covers the top and sides of the display panel, and the lower EMI shield covers the logic 
board along the bottom of the unit. The EMI tape and lower EMI shield are easily damaged when 
removed, and removal is necessary in order to access most components within the unit. 
Should the EMI tape that seals the display, or the EMI shield covering the bottom of the enclosure 
(see photo below) accidentally tear, use the EMI...

iMac (20-inch Late 2006) Take Apart — General Information 16
When properly repaired, all edges shown below will be wrapped by EMI tape, and the tape 
securely adhered to all edges. Use a “black stick” to flatten the EMI tape tightly and rub out air 
pockets and wrinkles. 

iMac (20-inch Late 2006) — What’s New 17
What’s New
13 December 2007
Troubleshooting---> No Video--> Symptom 2: No Video, Boot Chime Heard, White LED ON: Step 4 
was corrected to reference Step 7 instead of Step 8, which does not exist. 
29 October 2007
A note was added to the Logic Board Replacement section to tell service providers to install the 
iMac Firmware Update 1.2 (or later).For proper performance and reliability of the Intel Core 2 Duo processors, apply the iMac 
• 
firmware update after...

iMac (20-inch Late 2006) — What’s New 18
12 January 2007
The “
•  No Power” symptom in Troubleshooting has been updated.  If your computer won’t 
turn on, try removing and reinstalling the SO-DIMMs.  
4 December 2006
Troubleshooting has been updated with a new symptom, “
•  Display does not remain in its 
intended position when tilted.” 
11 November 2006
A drawing of the clutch mechanism (922-7002) was added to the Exploded View drawing.
• 
31 October 2006
Troubleshooting has been updated with a new...

iMac (Early 2006 20-inch) Take Apart — Access Door 19
Access Door
Tools
Phillips #2 screwdriver
• 
ESD-safe workstation and mat
• 
Soft , clean towel or cloth
• 
Preliminary Steps
Before you begin, lay the computer down so the panel is face down and the bottom is facing 
you.
Part Location 

iMac (Early 2006 20-inch) Take Apart — Access Door 20
Removing the Access Door
Raise the stand and use a Phillips #2 screwdriver, to loosen the two captive access door 
1.  
screws.  
Warning: The ambient light sensor is located to the left. Don’t mistake the ambient light 
sensor for a screw. Sticking a screw driver or other sharp object in the ambient light sensor 
could damage the computer.  
Remove the access door.  
2.  
Replacing the Access Door
Position the access door on the rear housing over the...