Introduction
Use this guide to replace the PRAM battery.
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Unplug your iMac's AC cord along with any peripheral devices.
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Lay your iMac face-down on a soft, clean surface as shown.
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Loosen the three Phillips screws securing the access door to the bottom edge of your iMac.
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Remove the access door.
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Gently slide the black plastic RAM pull tab out from the RAM slot.
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Pull the black plastic tab away from the bottom edge of the iMac to eject the module(s) on that side of the RAM bay.
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Outil utilisé dans cette étape :Heavy-Duty Suction Cups (Pair)$14.95
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Stick a suction cup near each of the two top corners of the glass panel.
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If your suction cups refuse to stick, try cleaning both the glass panel and the suction cup with a mild solvent.
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Remove the eight 8 mm T10 Torx screws securing the display to the outer case.
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Remove the following four screws:
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One 9.3 mm T10 Torx screw with a large head
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Three 9.3 mm T10 Torx screws with a normal sized head
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Lift the inner edge of the optical drive and maneuver its connector past the GPU frame attached to the logic board.
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Carefully pull the optical drive off its mounting pins on the right side of the outer case to gain clearance for disconnecting the optical drive cable.
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Allow the optical drive to hang down as you de-route the optical drive thermal sensor connector from behind the GPU heat sink.
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Remove the single 13 mm T10 Torx screw securing the optical drive fan to the outer case.
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In the proceeding steps, you will disconnect the following cables:
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SD Board and microphone
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Left/Right Speaker
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Wi-Fi Antenna
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Bluetooth/Ambient Light Sensor/Camera/Left Temperature Sensor, Hard Drive Temperature Sensor and Hard Drive Fan
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CPU Fan/Ambient Temperature and Power Button
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IR Sensor
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Remove the following four screws:
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One 9.3 mm T10 coarse-threaded screw
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One 25 mm T10 coarse-threaded screw
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Two 22 mm fine-threaded screws
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Pull the upper right and lower left corners of the power supply away from the rear case to dislodge the mounting posts attached to the power supply's corners.
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Carefully lift the power supply out of the outer case and rotate it to expose the cable lock as shown, minding the DC-out and AC-in cables still attaching it to the iMac.
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Disconnect the DC-out cable by depressing the locking mechanism on the connector while you pull the connector away from its socket on the power supply.
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Once the locking mechanism has cleared the socket, pull the DC-in connector away from the power supply.
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Use the tip of a spudger to pry the PRAM battery out of its socket on the logic board.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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12 commentaires
I can’t believe Apple put the PRAM battery there! Prior iMac models had them very easily accessible just behind the LCD screen. I just did a SSD install for someone and was going to replace the battery while I was at it. Not going to take a chance of breaking something in the process.
Me either. It’s ridiculous. Insures business at the repair center.
Plus it looks like they didn’t even put any testing points on the front of the mainboard. You have to pull the whole mainboard out just to measure the voltage? How do Apple techs deal with a PRAM battery issue? There’s got to be a hidden point somewhere to put a multi-meter on.