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Troubleshooting Testing for Power - 7
Testing J7 for Voltage on the Logic Board
The following voltages measure if the down converter is providing
the required voltages and are only present if the system is pow-
ered on. If the following voltages are not correct, refer to the “No
Power” troubleshooting symptom chart.
Measure the following voltages at J7 on the logic board:
1. Pin 2: +12 volts
2. Pin 4: +5 volts
3. Pin 14: +3.3 volts
Testing Voltages at J7 on the Logic Board
- Special Edition 1
- Overview 4
- Basics Overview - 2 5
- New Technologies 6
- FireWire 7
- VGA Output Port 8
- Features 9
- Graphics Support 11
- Communication 11
- CPU Speed 13
- L2 Cache 13
- System Bus Speed 14
- Main Memory 14
- Graphics Controller Chip 15
- Graphics Memory 15
- Hard Disk Drive 16
- CD Drive 16
- Front, Side, and Rear 18
- I/O Panel with FireWire 19
- I/O Panel without FireWire 20
- iMac Logic Board 21
- Repair Strategy/Warranty 22
- USA Ordering 23
- Warranty 24
- Canada Only 25
- Specifications 26
- Introduction 27
- Troubleshooting 28
- iMac, iMac DV, iMac DV 28
- Block Diagram 30
- Power Flow 31
- Testing for Power 32
- At the Logic Board 33
- The PMU Chip 37
- Power-On Self Test 39
- Power Button 40
- Logic Board Battery 41
- HFS Plus Formatted Drives 44
- Testing the Modem 45
- Before the Finder Appears 47
- No Power 48
- Possible Cause Possible Fix 49
- No Video or Unstable Raster 50
- Gray Screen 52
- Error Beep(s) 53
- Flashing Question Mark 54
- System Hangs During Boot 55
- After Startup 57
- System Hangs 58
- Distorted Video 59
- Thin White Line 60
- Tinting Video 61
- Garbage Video 62
- Memory Error Dialog 64
- Can’t Wake From Sleep 65
- Network Problems 66
- CD_ROM or DVD-ROM Vibration 67
- CD-ROM or DVD-ROM Won’t Eject 68
- Hard Drive Problems 71
- Sound Out Problems 72
- Sound In Problems 73
- USB Problems 75
- Cursor Problems 77
- USB Printer Problems 78
- Networked Printer Problems 79
- Modem Not Recognized 80
- Modem Dialing Problems 81
- Take Apart 82
- Procedures 84
- 5. Lift the bottom housing 87
- Replacement Caution: 88
- EMI Cover 89
- Take Apart EMI Cover - 8 90
- 1. Remove the six screws 90
- SDRAM DIMM 93
- CD/HD Carrier 101
- CD-ROM / DVD-ROM 105
- Important: 107
- Manual Eject Button 110
- CD-ROM or DVD-ROM 112
- Module Replacement 112
- CD/DVD Adapter 115
- Hard Drive 117
- Hard Drive Replacement 120
- Logic Board 121
- Replacement Note: 126
- Identifying the Version 2 128
- 350 MHz Logic Board 128
- Down Converter Board 131
- Adjustments 136
- Adjustment Tools 137
- Light Meter Setup 138
- Model R77 139
- Caution: 141
- Jumper Adjustment 142
- Warning: 143
- Focus Adjustment 146
- Screen Voltage 149
- Cutoff Adjustment 156
- White Balance 166
- 9. Click the Factory 172
- Settings button 172
- Geometry Adjust 173
- S Correction 179
- Adjustment 179
- Sticking Power 184
- LED Alignment 187
- Procedure 187
- 2. Lift the bottom housing 188
- Inner Bezel Sanding 192
- Reimbursement Procedure 193
- Note: The modem is located 196
- Take Apart Modem - 5 7 198
- 3. Turn the logic board to 198
- Note: As you slide the I/ 199
- Modem Replacement 200
- I/O Panel 201
- Take Apart I/O Panel - 62 203
- 3. Turn the logic board 203
- Front Outer Bezel 205
- 2. After removing the tabs 207
- Note: The bezel tabs fit 208
- ±Warning: This product 210
- 2. Pry the tabs off, and 212
- 6. Lift the top rear housing 215
- Divider Panel 216
- 6. Open the CRT cable 220
- Caution: Be careful when 225
- 13. Loosen the CRT neck 226
- 14. Carefully pull the video 227
- Note: Continue with the 228
- 16. Remove the following 229
- 922-4044 230
- Power/Analog/Video 231
- 12. Loosen the CRT neck 240
- 13. Carefully pull the video 241
- 14. Holding on to the side 242
- Replacement Note: If 244
- Identifying the Rev. 2 245
- Important: The switch 246
- Note: To separate the left 251
- Take Apart Side Panels - 111 252
- Take Apart Antenna - 114 255
- • bottom housing 255
- • front outer bezel 255
- • top rear housing 255
- • divider panel assembly 255
- Take Apart Antenna - 115 256
- 1. Remove the three screws 256
- Important: Note how the 257
- Take Apart Antenna - 117 258
- 3. Carefully remove the 258
- Speakers 260
- Note: If you are certain 261
- CRT Switch Settings on 268
- Replacing the Microphone 272
- Take Apart Microphone - 132 273
- 3. Check that the 273
- Replacement Note: If you’re 359
- Take Apart Side Panels - 108 364
- Take Apart Antenna - 111 367
- Take Apart Antenna - 112 368
- Take Apart Microphone - 127 383
- Upgrades 388
- AirPort Card 395
- Protective 397
- Guide Rails 397
- Connect an 402
- External Monitor 402
- Vented Cover VGA Vented Cover 404
- Vented Cover 405
- VGA Vented Cover 406
- Exploded View 408
- Exploded View 1 409
- Colored Service Parts 410
- Cable Locator 411
- Screw Matrix 412
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