CDDVD Adapter Board
Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following 1. Using a jeweler's screwdriver, remove the two screws on the CD DVD adapter board. 2. Remove the adapter board from the back of the CD-ROM. Note Return the CD DVD-ROM drive to Apple without the cables, carrier, or the adapter board. Refer to the parts database for more information.
Speakers
Before you begin, rest the computer on an ESD mat or other soft surface, and remove the bottom housing. The EMI coveris removed in this photo, but it is not necessary to remove it to access the speakers. Note Service parts package speakers as a kit. A left and right speaker will be in each kit. Disconnect the short speaker cable next to the speaker. Note If you are certain a speaker is faulty, the easiest removal method is to gently push the speaker down in the direction of the arrow. This will...
Connect an External Monitor
If the Mac has a VGA output port, you can connect an external monitor to the computer and mirror, or show, what's on the computer display to a larger audience. Note You can't use this port to connect a second monitor to extend the desktop. I 0 0 0 0 0 gt 'n0 0 0 0 O 0 0 0 0 0 n rffiorPo 09 n o 0 00 0 0 0 0 0 0 0 0 o 0 0 O 0 0 0 o A V on nnoo00000o0onrir J oof 1 0 0 0 rj no 0 0 0 0 0 O 0 O O o do 0 nOrO H J vO 0 oJO 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ooPpp n-'l 0n O O o 0 0 0 0 0 0 0 0 0 0 0 0 n of'o '...
Logic Board Battery
Important Apple highly recommends removing the battery when handling the logic board. Make sure to use proper ESD protection when handling modules. The battery on the logic board controls the stored system settings, such as date and time. It is only necessary to test the battery when you can't power on the computer, or the date and time are reset every time the AC power is removed. The battery is also used to power the PMU chip because the PMU chip keeps time and must always be running when the...
Geometry Adjustments
Before you begin, connect the jumper adjustment tool to the video board refer to the Jumper Adjustment Tool mentioned earlier in this section. Open the Display Adjustment Utility. 3. Select a resolution for adjustment from the Resolution menu. Note Don't use the control strip or Monitors control panel to set the resolution. 4. Adjust the geometry settings by moving the appropriate slider bar. 5. Click the Save button to save the adjustments for that resolution. Note Repeat steps 2-4 for each...
Introduction
Specifications information for this product can be found in the Spec Database, which you can access at Service Source Online http service.info.apple.com or on Service Source CD. Spec Database at Service Source Online From the Service Source Online home page, click Troubleshoot and Repair to access the main repair procedures page. Then click either Apple Spec in the navigation table in the upper right corner of the page, or click Apple Spec Database from the list of reference tools below. Open...
Testing the PowerAnalog Board Fuse
First remove the bottom housing, front outer bezel, and the top rear housing to access the power analog board. The fuse is located near the AC plug. Warning You must unplug the iMac to do a continuity test at the power supply board fuse. You will need an ohm meter to do a continuity test on the power supply board fuse. Refer to the picture below to located the necessary test point referenced in the following procedure. Unplug the computer to take this reading. Using an ohm meter, touch the red...
At the Logic Board
With the iMac placed with the CRT face down on a soft surface, remove the bottom housing and the EMI cover to access the logic board. Testing J9 for 5 V Trickle Power on the Logic Board You will need a volt meter to test for power on the logic board. Refer to the picture on the next page to locate the necessary test point referenced in the following procedure. Plug in the computer, but leave the iMac powered OFF. Ground the black probe on the volt meter to the logic board screw, as shown in the...
AirPort Card
Place a soft towel or cloth on the desk or surface. 1. Position the screen face down on the cloth.Use a coin or flatblade screwdriver to turn the latch counterclockwise on the access door. 3. Touch the metal EMI shield inside the recessed latch area before touching any components on the main logic board. Detach the antenna from the left guide rail. Remove the protective antenna cap from the end of the antenna and store the cap in a safe place. Slide the AirPort Card into the adapter card. Note...
No Power
In a No Power situation, the system is completely dead. There is no LED, no hard drive power, and the screen is completely black. Refer to Testing for Power earlier in this chapter for instructions on how to test for power at each component referenced in this procedure. Bad power cord, connection, or outlet. - Verify the power outlet is good. - Try a known-good power cord to determine if the existing power cord could be the problem. Make sure the power cord is connected securely at both ends....
Wire Wra p
6. Open the CRT cable clamps. Remove the wires from the cable clamps. 7. Partially lift the side panels with the power analog video board attached to the divider panel up and off the inner bezel to gain access to connector P501 on the power analog video board. 8. Disconnect P501 and P701 on the power analog video board. The cables are located near the high voltage capacitor. 9. On the other side of the CRT neck, disconnect the brown degauss cable, P901, from the power analog video board. 10....
PowerAnalogVideo Board 1
Before you begin, discharge the CRT, rest the computer on an ESD mat or other soft surface and remove the following Note This shows the power analog video board still attached to the divider panel and the side panels. Warning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. 1. Disconnect the microphone connector located near the top of the CRT. 3. Unwrap the bendable degauss cable wraps in the upper left and...
No Video or Unstable Raster
Normal startup boot chime, the LED is on, and the hard drive starts up. The display, however, is solid gray. - Reset parameter RAM. Hold down lt Command gt lt Option gt lt P gt lt R gt during startup before Welcome to Macintosh appears. - Boot off the system CD that came with the unit. Do you see a normal screen display now Yes Reinstall system software. You must use the system software CD that came with the unit to get the correct version of Mac OS. No Go to next step. The PMU chip or logic...
SymptomCure Tables System Problems After Startup
If you experience system problems after a successful startup i.e., after the Finder appears on the screen , most likely the problem is not with the iMac hardware with the exception of some possible RAM issues . Following are troubleshooting tables with problem symptoms that you may see after the Finder appears. Possible causes for each symptom can be found in the left-hand column with the corresponding fixes in the right-hand column. The troubleshooting information is presented in the order of...
Ejecting a CD or DVD Disc Part 1
There are two internal levers on a slot-loading CD-DVD drive that help center a CD-DVD disc. Some CDs and DVDs have and uneven edge which can cause enough friction to prevent the disc from ejecting. If this happens, follow these steps 1 Take a large paperclip and unbend it so that you can insert it into the CD DVD slot as shown below about 1.5 inches from the left edge of the slot. 2 With the other hand, drag the disc icon on the desktop to the Trash to force the computer to eject the disc. 3...
PowerAnalogVideo Board
Before you begin, discharge the CRT, rest the computer on an ESD mat or other soft surface and remove the following Note There is a new power analog video board, part number 661-2315, Rev. 2. Refer to Identifying the Rev. 2 Power Analog Video Board in this section. Warning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. 1. Disconnect the microphone connector located near the top of the CRT. 3. Unwrap the...
Inner Bezel Sanding
1. Remove the inner power button so that the LED is exposed, as shown in the graphic. 2. Using a 180 grit or higher Silicon Carbide wet dry sandpaper, lightly sand the edge of the lower section of the button recess indicated by the red arrows . Sand the edge until you have removed any sharp edges on the outside of the button recess. The goal is to ensure that there is a slight uniform radius around the entire edge of the button recess. 3. Clean out the inner button recess making sure to remove...
Inner Bezel Sanding 1
1. Remove the inner power button so that the LED is exposed, as shown in the graphic. 2. Using a 180 grit or higher Silicon Carbide wet dry sandpaper, lightly sand the edge of the lower section of the button recess indicated by the red arrows . Sand the edge until you have removed any sharp edges on the outside of the button recess. The goal is to ensure that there is a slight uniform radius around the entire edge of the button recess. 3. Clean out the inner button recess making sure to remove...
Side Panels 1
Warning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Before you begin, discharge the CRT, rest the computer on an ESD mat or other soft surface and remove the following 1. Undo the wire wraps in the top corners or the CRT. 2. Lift the degauss cable out of the way to access the side panel screws. There are two screws on each side. 3. On the rear of the side panels, remove four screws. These screws connect...
Front Outer Bezel
Before you begin, place the computer on an ESD mat and remove the bottom housing. screwdriver, carefully remove the two tabs on the front outer bezel. Refer to the next graphic for a close-up of the tab removal. 2. After removing the tabs, remove the screws located under the tabs. Note The bezel tabs fit tightly into the rear housing. A good, hard pull upward is required to release all the tabs. 3. Insert a plastic tool underneath the bezel. 4. Pry the outer bezel tabs from the rear housing...
Power Button
The power button on the front of the iMac see Table 1 below will power up the computer, or put it to sleep, but it will not shut the iMac down. Note When the iMac is in Sleep mode, the amber LED pulses on and off. The power button on the keyboard see Table 2 below retains previous functionality. The keyboard button can power up the iMac, put the iMac to sleep, or shut down the computer with a press of the button. And, as before, you can shut down the computer by selecting Shut Down in the...
IO Panel
Before you begin, position the computer upside down, resting the computer on an ESD mat or other soft surface and remove the following 1. Disconnect the cable at J12, going from the logic board to the I O panel. 2. Remove the two screws on the I O panel. 3. Turn the logic board over and remove the modem screw. 4. Rotate the logic board face up again and carefully slide the I O panel off the logic board. Note As you slide the I O panel off the logic board, support the modem with your hand so the...
Resetting the PMU on the Logic Board
Resetting the PMU Power Management Unit on the logic board can resolve many system problems. Whenever you have a unit that fails to power up, you should follow this procedure before replacing any modules. 1. Disconnect the power cord and check the battery in the battery holder BT1 . The battery should read 3.3 to 3.7 volts. If the battery is bad, replace the battery, wait ten seconds, and then reset the PMU refer to the next step . If the battery is good, go to the next step. 2. Press the PMU...
Side tone IWin Wrap
Lift the degauss cable out of the way to access the side panel screws. Using a narrow shaft screwdriver, remove the four side panel screws two on each side that attach the left and right side panels to the inner bezel. 6. Open the CRT cable clamps. Remove the wires from the cable clamps. 7. Partially lift the side panels with the power analog video board attached to the divider panel up and off the inner bezel to gain access to connector P501 on the power analog video board. 8. Disconnect P501...
PowerOn Self Test
There is a power-on self test that resides in the ROM of the iMac. This test automatically runs whenever the iMac is powered on after being fully shut down the power-on self test does not run if the machine is only restarted . If a problem is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below. Refer to Error Beeps later in this chapter for instructions on how to troubleshoot and repair an iMac that sounds error beeps at startup...