EMac Repair Extension Program for Video and Power Issues

The eMac Repair Extension Program (REP) for Video and Power Issues covers repairs for eMac (USB 2.0) computers exhibiting issues due to specific component failure. Program instructions and the CompTIA code for eMac REP repairs are provided in this chapter. The eMac REP for Video and Power Issues covers eMac (USB 2.0) models that exhibit one of the following video- or power-related symptoms Scrambled or distorted video Intermittent system freezes or crashes System crashes during the startup...

Installing the Replacement Card

The original AirPort Card can not be used in this computer. You must use the AirPort Extreme card. (Figure 6) Note Previous models of eMac used the original AirPort card. For compatibility information, see AppleCare Knowledge Base article 107440 AirPort Extreme Card Compatible Macintosh Computers. 2. Insert the AirPort Extreme Card, barcode facing up into the AirPort Extreme card slot. (Figure 7) 3. Attach the antenna cable firmly to the port on the end of the card. (Figure 8) Figure 8 4. Push...

Preliminary Steps

Where The Mac Power Buttom Located

Place the computer face down on an ESD mat. Remove the user access door. Remove the digital assembly. Remove the hard drive carrier Remove the AirPort Extreme Card if present 1. Disconnect the optical data cable, the optical power cable and release the heatsink clip. Note On education models the optical cables are not present because there isn't an optical drive. 2. Remove the down converter screw that attaches to the chassis frame. 3. On the left side, disconnect the power button cable and...

Removing the Installed Card

Untuck the clear plastic tab on the AirPort Extreme card. Figure 3 Figure 3 2. Pull the AirPort Extreme card out of the slot a little bit to access the antenna cable. Figure 4 3. Disconnect the AirPort Extreme cable from the port on the card, then completely remove the card from the slot. Figure 5

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...

IO Ports

Emac Pmu Reset Button

The ports listed from left to right are The PMU Power Management Unit is a micro controller chip that controls all power functions for the computer. The PMU is a computer within a computer. It has memory, software, firmware, I O, two crystals, and a CPU. Its function is to Tell the computer to turn on, turn off, sleep, wake, idle, etc. Manage system resets from various commands. Maintain parameter RAM PRAM . Manage the real-time clock. Important The PMU is very sensitive and touching the...

Whats New April

Apple announced a revision to the eMac product family. Powered by G4 processors running at up to 1.25GHz, with a system bus of 167 MHz, the new eMac models come with Mac OS X v.10.3 and include Apple's iLife application suite, providing iMovie, iPhoto, and iTunes as a standard software configuration. No-optical drive configuration This computer is available in a low-cost no-optical drive configuration Modem except for the educational configuration, the eMac USB 2.0 has an internal, fax modem...

No sound from either internal or external speakers

Verify volume setting is correct in system preferences. 2. Verify the computer is not set to mute. Press the mute key on the Apple keyboard. 3. Reset parameter RAM. Press Command-Option-P-R during startup. 4. Boot from Apple Hardware Test hold down the C key at startup . Run both quick and extended tests. Proceed based on any error codes given. See AppleCare Knowledge Base article 112125 - Service Diagnostics Matrix for Error Code information. 5. Test the computer with known-good headphones....

Flashing question mark appears on the screen

Boot from the system CD that came with the computer and see if the hard drive mounts on the desktop. 2. Boot from Apple Hardware Test hold down the C key at startup . Run both quick and extended tests. Proceed based on any error codes given. See AppleCare Knowledge Base article 112125 - Service Diagnostics Matrix for Error Code information. 3. If no hard drive is found in Drive Setup, verify the hard drive cable connections. 4. Replace the hard drive cable. 5. Reinstall the software drivers...

Hard drive does not spin

Disconnect any connected peripherals. 2. Boot from Apple Hardware Test hold down the C key at startup . Run both quick and extended tests. Proceed based on any error codes given. See AppleCare Knowledge Base article 112125 - Service Diagnostics Matrix for Error Code information. 3. Launch Drive Setup and update the hard drive driver. 4. If no hard drive is found in Drive Setup, verify the hard drive cable connections. 5. Replace the hard drive cable.