Acer Chromebook CB3-431-C5EX Motherboard Replacement

Introduction

This is a guide to replace a faulty motherboard in an Acer Chromebook CB3-431-C5EX laptop. You will need a Phillips #0 screwdriver, iFixit opening tool, Tweezers, and a Heat gun. Be cautious when removing the motherboard because of having to handle wires.

What you need

Step 1 Bottom Panel

Acer Chromebook CB3-431-C5EX Motherboard Replacement, Bottom Panel: step 1, image 1 of 1

Working on your device while it is turned on may result in electric shock. Make sure to shut down and unplug your device before you begin.
Turn device over so the bottom panel is facing you.

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Step 2

Remove the eight 4mm Phillips #0 screws.
Remove the two 6mm Phillips #0 screws.

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Step 3

Insert a plastic opening tool into the crack between the bottom panel and the side of the computer.
Gently pry the panel off the computer by continuously pulling up and on the panel and moving the plastic opening tool around the crack until the panel comes off.
There are several clips holding the cover in place.
Remove the bottom panel and set it aside.

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Step 4 Battery

Acer Chromebook CB3-431-C5EX Motherboard Replacement, Battery: step 4, image 1 of 1

Remove the two 4mm Phillips #0 screws on either side of the battery pack that are securing it in place.

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Step 5

Disconnect the taped white 8-pin cable on the bottom right of the battery pack.
Use thumbnail to pull on the small protruding tabs on either side of the connector.

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Step 6

Carefully lift the entire battery pack out of the laptop.

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Step 7 Motherboard

Acer Chromebook CB3-431-C5EX Motherboard Replacement, Motherboard: step 7, image 1 of 2

Acer Chromebook CB3-431-C5EX Motherboard Replacement, Motherboard: step 7, image 2 of 2

Remove the 4.7 mm screw from the Wi-Fi card using a Phillips #0 screwdriver.
Remove the Wi-Fi card from the laptop.

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Step 8

Unplug the black wire connecting the small circuit board to the motherboard.

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Step 9

Acer Chromebook CB3-431-C5EX Motherboard Replacement: step 9, image 3 of 3

Lift the respective white and black tabs and slide the ribbon cables out of their connectors.

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Step 10

Carefully remove the display adapter from the motherboard.

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Step 11

Remove the black tab connecting the motherboard to the keyboard.

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Step 12

Remove the five 4.7 mm screws from the motherboard using a Phillips #0 screwdriver.
Remove the two 4.5 mm screws from the motherboard using a Phillips #0 screwdriver.
Gently remove motherboard from the laptop.