Introdução
Follow this guide to replace the PRAM battery in a 21.5" Retina 4K Late 2015 iMac. The PRAM battery is located on the back side of the logic board, so replacing it requires first removing the logic board.
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Before beginning any work on your iMac: Unplug the computer and press and hold the power button for ten seconds to discharge the power supply's capacitors.
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Hold the display with one hand while using your other hand to unplug the display power cable.
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Remove the following five Phillips screws holding the lower support bracket in place:
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Four 3.2 mm screws
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One 1.7 mm screw
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Gently pull the right speaker cable connector straight down and out of its socket on the logic board.
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Remove the following T10 Torx screws securing the hard drive brackets to the iMac:
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Two 21 mm screws
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One 9 mm screw
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One 27 mm screw
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Use the tip of a spudger to push each side of the power button cable connector and gently walk it out of its socket.
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Gently pull the fan cable connector straight out of its socket on the logic board.
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Lift the hard drive from the edge nearest the logic board and pull it slightly out of its recess.
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Remove the 7.3 mm T8 Torx screw securing the hard drive tray to the rear enclosure.
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Gently pull the left speaker cable straight out of its socket on the logic board.
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Gently push the battery away from the two plastic nubs. (This puts increased pressure on the spring contact at the other end.)
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Once the battery's edge clears the two nubs, tilt it up out of its socket.
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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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