iMac Intel 21.5" EMC 2638 Logic Board Assembly Replacement

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Nov 13, 2015 - 01:48:59

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Introduction

Prereq for removing logic board.

What you need

Step 1 Logic Board Assembly

iMac Intel 21.5" EMC 2638 Logic Board Assembly Replacement, Logic Board Assembly: step 1, image 1 of 2

iMac Intel 21.5" EMC 2638 Logic Board Assembly Replacement, Logic Board Assembly: step 1, image 2 of 2

Push on each side of the left speaker cable connector with the tip of a spudger and gently walk it out of its socket.

Step 2

If necessary, use a pair of tweezers to gently peel the tape securing the left speaker cable to the SATA data/power cable.

Step 3

iMac Intel 21.5" EMC 2638 Logic Board Assembly Replacement: step 3, image 3 of 3

De-route the left speaker cable by pulling it straight up out of the retaining clip in the back of the rear enclosure.
In a similar fashion, lift the combo SATA data/power cable up out of the retaining clip.

Step 4

iMac Intel 21.5" EMC 2638 Logic Board Assembly Replacement: step 4, image 3 of 3

Use the flat edge of a spudger to flip up the metal retaining bracket on the iSight camera cable connector.
Pull the iSight camera cable straight out of its socket on the logic board.
Do not use excessive force. This is a delicate connector that can be easily damaged.

Step 5

iMac Intel 21.5" EMC 2638 Logic Board Assembly Replacement: step 5, image 3 of 3

Use the flat edge of a spudger to disconnect each of the four antenna connectors from the AirPort/Bluetooth card.
Note the original positions for each connector when reconnecting the cables.

Step 6

iMac Intel 21.5" EMC 2638 Logic Board Assembly Replacement: step 6, image 3 of 3

Use the flat edge of a spudger to pry the headphone jack cable connector from its socket on the logic board.
Push the cable slightly to the right to clear it for the removal of the logic board.

Step 7

Remove the following screws securing the exhaust duct to the rear enclosure:
Two 6.3 mm T8 screws
Two 4.7 mm T8 screws

Step 8

Remove the four 7.2 mm T10 screws securing the logic board to the rear enclosure.

Step 9

iMac Intel 21.5" EMC 2638 Logic Board Assembly Replacement: step 9, image 3 of 3

Tilt the top of the logic board away from the rear enclosure.
Lift the logic board straight up and out of the iMac.
Be careful not to snag the board on any of the rear case's screw posts.
The I/O boards at the bottom of the logic board will be the greatest challenge. It is recommended to pull gently to avoid any damage.