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Apple IMAC Service Source - Page 138

Neck Extension Identification

UPC - 067540444435

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Neck Extension Identification There are many neck assemblies and display panels for the iMac (Flat Panel) computers. Identify which neck assembly belongs in the system by the 620-xxxx tag attached to the TMDS cable (circled below). Refer to the Neck Identification table on the next page for more information. Neck Extension Identification iMac (USB 2.0) Take Apart - 129

Section	Page
iMac (USB 2.0)	1
Basics	3
Overview	4
How to identify these models	4
What’s New	5
New Features, November 2003	5
New Service Parts for the 20-inch iMac (USB 2.0)	5
Standard Configurations	6
Serial Number Location	7
Take Apart	9
General Information	10
Overview: November 2003	10
New Procedures	10
Tools	10
Service Stand	11
User Access Plate	12
Tools	12
Part Location	12
Preliminary Steps	12
Procedure	13
AirPort Extreme Card	14
Tools	14
Part Location	14
Preliminary Steps	14
Procedure	15
Memory, SO-DIMM (user- installable)	16
Tools	16
No tools are required for this procedure.	16
Part Location	16
Preliminary Steps	16
Procedure	17
Bottom Housing	19
Tools	19
Part Location	19
Preliminary Steps	19
Procedure	20
Thermal Paste Application	24
Tools	24
Part Location	24
Procedure	25
RJ-11 Modem Filter Board	27
Tools	27
Part Location	27
Preliminary Steps	27
Procedure	28
Modem	29
Tools	29
Part Location	29
Preliminary Steps	29
Procedure	30
Memory (factory-installed)	31
Tools	31
Part Location	31
Preliminary Steps	31
Procedure	32
Battery	33
Tools	33
Part Location	33
Preliminary Steps	33
Procedure	34
Logic Board	35
Tools	35
Part Location	35
Preliminary Steps	35
Procedure	36
Bluetooth Board and Cable	38
Tools	38
Part Location	38
Preliminary Steps	38
Procedure	39
I/O Port Covers	41
Tools	41
Part Location	41
Preliminary Steps	41
Procedure	42
AirPort Antenna Extension Cable	43
Tools	43
Part Location	43
Preliminary Steps	43
Procedure	44
Thermal Pad Installation	45
Tools	45
Part Location	45
Procedure	46
AC Line Filter	47
Tools	47
Part Location	47
Preliminary Steps	47
Procedure	48
Drive Carrier Assembly (Optical and Hard Drive)	50
Tools	50
Part Location	50
Preliminary Steps	50
Procedure	51
Power Supply	56
Tools	56
Part Location	56
Preliminary Steps	56
Procedure	57
Optical Drive Door	61
Tools	61
Part Location	61
Preliminary Steps	61
Procedure	62
Speaker, Internal	66
Tools	66
Part Location	66
Preliminary Steps	66
Procedure	67
Fan	68
Tools	68
Part Location	68
Preliminary Steps	68
Procedure	69
Power Supply Insulators	71
Tools	71
No tools are required for this procedure.	71
Part Location	71
Preliminary Steps	71
Procedure	72
Fan Retainer Bracket (under fan)	73
Tools	73
Part Location	73
Preliminary Steps	73
Procedure	74
Fan Gasket	76
Tools	76
No tools are required for this procedure.	76
Part Location	76
Preliminary Steps	76
Procedure	77
Cap, Neck Spoke Retainer	78
Tools	78
Part Location	78
Preliminary Steps	78
Procedure	79
Chassis (Faraday Cage)	81
Tools	81
Part Location	81
Preliminary Steps	81
Procedure	82
Antenna, Wireless	86
Tools	86
Part Location	86
Preliminary Steps	86
Procedure	88
Replacing the AirPort Antenna	89
Procedure	89
Housing, Outer Shell, Plastic	91
Tools	91
Part Location	91
Preliminary Steps	91
Procedure	93
Display, 20\	96
Tools	96
Part Location	96
Preliminary Steps	96
Procedure	97
Replacing the EMI Panel Gaskets	102
Tools	102
Procedure	102
Display, 17\	104
Tools	104
Part Location	104
Preliminary Steps	104
Procedure	105
Replacing the 17\	109
Display, 15\	111
Tools	111
Part Location	111
Preliminary Steps	111
Procedure	112
Inverter, 20\	117
Tools	117
Part Location	117
Preliminary Steps	117
Procedure	118
Inverter, 17\	119
Tools	119
Part Location	119
Preliminary Steps	119
Procedure	120
Inverter, 15\	122
Tools	122
Part Location	122
Preliminary Steps	122
Procedure	123
Panel Shield, 15\	124
Tools	124
Part Location	124
Preliminary Steps	124
Procedure	125
LED, 20\	128
Part Location	128
Preliminary Steps	128
Microphone, 20\	129
Part Location	129
Preliminary Steps	129
Back Cover, 20\	130
Tools	130
Part Location	130
Preliminary Steps	130
Procedure	131
Back Cover, 17\	134
Tools	134
Part Location	134
Preliminary Steps	134
Procedure	135
Back Cover, 15\	136
Tools	136
Part Location	136
Preliminary Steps	136
Procedure	137
Neck Extension Identification	138
Neck Identification Table	139
Neck Assemblies KBase Article	139
Neck Assembly, 20\	140
Tools	140
Part Location	140
Preliminary Steps	140
Procedure	141
Neck Assembly, 15\	142
Tools	142
Part Location	142
Preliminary Steps	142
Procedure	143
Troubleshooting	145
General Information	146
Overview:	146
Important Things to Remember:	146
Logic Board, Top	148
Logic Board, Bottom	149
I/O Ports	150
The PMU Chip	150
Resetting the PMU on the Logic Board	151
Diagnostic Test Points	152
Logic Board Battery	153
Testing the Battery	153
Thermal Paste Application	155
Tools	155
Paste Location	155
Procedure	156
Thermal Pad Replacement Instructions	157
Symptom Charts	158
How to Use the Symptom Charts	158
Apple Hardware Test	158
Error Codes	158
No Power	159
No fan, no hard drive noise, and the screen is black.	159
No Video	161
Screen is dark, fan is running and the hard drive is spinning. You may hear the startup chime as ...	161
No LED	162
LED on the 17-inch display bezel does not light up	162
LED on the 15-inch display bezel does not light up	162
Display Tilt	163
Screen tilts to the left or the right even after a manual adjustment.	163
When displaying a single color over the screen area, the LCD panel shows one or more pixels that ...	165
Hard Drive	166
Hard Drive won’t mount to the desktop	166
Flashing question mark appears on the screen	166
System hangs during normal startup process	166
Optical Drive	167
Optical drive won’t mount to the desktop	167
Can’t boot from the optical drive	167
Optical disc constantly ejects	167
Sound Out	168
No sound from either internal or external speakers	168
Sound In	169
No sound is recorded	169
Error Beep(s)	170
Computer beeps at startup.	170
Modem	171
No modem dial tone	171
I/O Ports	172
Difficulty Plugging in an Ethernet Cable	172
Upgrades	173
Memory, SO-DIMM	174
Tools	174
Part Location	174
Procedure	175
Opening the Computer	175
Installing the Memory Module	178
Closing the Computer	179
AirPort Extreme Card	180
Tools	180
Part Location	180
Opening the Computer	181
Installing the AirPort Extreme Card	184
Closing the Computer	185
Views	187
Exploded View, Base Unit, (iMac USB 2.0))	188
Display Panel, (20”, 1.25 GHz, USB 2.0)	189
Display Panel, (17”, 1.25 GHz, USB 2.0)	190
Display Panel, (15”, 1 GHz, USB 2.0)	191
Screw Matrix Locator 1 of 8	192
Screw Matrix Locator 2 of 8	193
Screw Matrix Locator 3 of 8	194
Screw Matrix Locator 4 of 8	195
Screw Matrix Locator 5 of 8	196
Screw Matrix Locator 6 of 8	197
Screw Matrix Locator 7 of 8	198
Screw Matrix Locator 8 of 8	199