Power Supply Verification

To power on, the computer's logic board requires a trickle power of +5V. If the system fails to power on, first reset the PMU. Then follow the procedure outlined below to determine whether the problem is related to the power supply. Note To verify the power supply, you need a volt meter. When connecting the volt meter leads to specific pins, make sure the power supply remains securely plugged into its connector on the logic board. The following figure shows the pins and voltage on the...

Before Opening the Computer

Warning The power supply in this computer is a high-voltage component and should not be opened for any reason, even when the computer is off. Warning After shutting down the computer, you must wait a few minutes before servicing it to allow internal components to cool. Important The only way to shut off power completely to the computer and display is to disconnect their power plugs from the power source. Make sure the power cords to the computer and display are within easy reach. Electrostatic...

Preliminary Steps

Remove the optical drive carrier. 1. Using a small flat-blade screwdriver, lift up the locking tab on the speaker cable connector and disconnect the cable from the logic board. 2. Remove the cable from the cable guide. 3. Route the cable up and out through the opening in the optical drive shelf and out from under the speaker case. 4. Remove the speaker mounting screw. 4. Remove the speaker mounting screw. 5. Swing the speaker away from the chassis. Press in on the...