LG Cosmos Motherboard Replacement

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Introduction

Use this guide to replace a faulty or dead motherboard in the LG Cosmos.

The motherboard is an essential device component, connecting all its parts. The keyboard, screen, and speakers are all connected via the motherboard. Input errors, screen malfunctions, or sound issues can be symptoms of the motherboard.

If you encounter any complications, consult the troubleshooting guide for help. These issues can be the individual parts themselves.

Be careful when dismantling the device. Ensure the battery is not damaged, and avoid rushing through the guide. Take your time when dealing with the cables inside the device.

What you need

Step 1 Battery

LG Cosmos Motherboard Replacement, Battery: step 1, image 1 of 1

Apply an upward force to slide the back cover off.

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Step 2

Use your finger to push down on the top of the battery and pull it out.

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Step 3 Rear Case

LG Cosmos Motherboard Replacement, Rear Case: step 3, image 1 of 1

Remove the five 3.0mm Phillips #000 screws along the edge of the rear case.

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Step 4

Use a plastic opening tool to pry the rear case loose.

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Step 5

Once the rear case is loose, lift it from the rest of the phone.

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Step 6 Motherboard

LG Cosmos Motherboard Replacement, Motherboard: step 6, image 1 of 1

Remove the two 2.9 mm Phillips #000 screws that are slightly off-centered to the right.

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Step 7

Use the plastic opening tool to pry the motherboard loose.

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Step 8

Hold the motherboard from the top and bottom and slowly lift the motherboard until you feel a pull.
The flex cable is attached at the bottom of the motherboard and can be damaged if too much lifting force is applied.