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Lenovo ThinkPad L390 Motherboard Replacement

Introduction

In this guide, the motherboard of the Lenovo ThinkPad L390 is being removed for replacement because the motherboard is damaged. The motherboard is a key component within any device. It’s responsible for facilitating communication between all of the device’s main components. Without the motherboard, the device becomes unusable. Before removing the motherboard, make sure to remove any connecting power cables and to only proceed if your battery charge is at 25% or lower. This is to prevent your battery from exploding or catching on fire in case of a puncture. After removing the motherboard, the proper steps to dispose of it would be to take it to a facility that takes electronic waste.

What you need

  1. Lenovo ThinkPad L390 Motherboard Replacement, Lower Case: step 1, image 1 of 2 Lenovo ThinkPad L390 Motherboard Replacement, Lower Case: step 1, image 2 of 2

    • Before you begin, discharge your laptop battery below 25%. A charged lithium-ion battery can catch fire and/or explode if accidentally punctured. Lay the device down with the lower case facing up.

    • Power off your laptop and disconnect the charger and any peripheries before beginning disassembly.

    • Unscrew the nine 5 mm Phillips #00 screws that secure the lower case.

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  2. Lenovo ThinkPad L390 Motherboard Replacement: step 2, image 1 of 2 Lenovo ThinkPad L390 Motherboard Replacement: step 2, image 2 of 2

    • Insert an opening tool in the gap between the lower case and the chassis.

    • Pry around the entire perimeter of the lower case until it fully releases.

    • Lift the lower case up and off.

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  3. Lenovo ThinkPad L390 Motherboard Replacement, Lenovo ThinkPad L390 Battery Disconnection: step 3, image 1 of 1

    • Use your fingernails or two opening tools to gently "walk" the battery connector directly out of its socket.

    • Do not pull on the wires.

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  4. Lenovo ThinkPad L390 Motherboard Replacement, Fan and Heat Sink: step 4, image 1 of 1

    • Remove the four 4 mm Phillips #00 screws that secure the heat sink.

    • Remove the 6 mm Phillips #00 screw that secures the fan.

    • Do not begin to remove the fan just yet.

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  5. Lenovo ThinkPad L390 Motherboard Replacement: step 5, image 1 of 2 Lenovo ThinkPad L390 Motherboard Replacement: step 5, image 2 of 2

    • Grip the fan/heat sink assembly from both sides and lift it up and out of the chassis.

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  7. Lenovo ThinkPad L390 Motherboard Replacement, Removing heat fan/heat sink: step 6, image 1 of 2 Lenovo ThinkPad L390 Motherboard Replacement, Removing heat fan/heat sink: step 6, image 2 of 2

    • Remove the 6 mm Phillips #00 screw that from the fan/heat sink as highlighted in step 4

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  8. Lenovo ThinkPad L390 Motherboard Replacement, Removing Side Pieces: step 7, image 1 of 3 Lenovo ThinkPad L390 Motherboard Replacement, Removing Side Pieces: step 7, image 2 of 3 Lenovo ThinkPad L390 Motherboard Replacement, Removing Side Pieces: step 7, image 3 of 3

    • Remove the six 4mm #00 phillips screws that secure the metal tabs on both sides of the computer.

    • Gently lift the metal piece up and away from the computer to remove. Do this for both of the metal pieces.

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  9. Lenovo ThinkPad L390 Motherboard Replacement: step 8, image 1 of 3 Lenovo ThinkPad L390 Motherboard Replacement: step 8, image 2 of 3 Lenovo ThinkPad L390 Motherboard Replacement: step 8, image 3 of 3

    • Use the opening tool to gently lift the black flap up and pull the display cable connector out of the socket.

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  10. Lenovo ThinkPad L390 Motherboard Replacement: step 9, image 1 of 2 Lenovo ThinkPad L390 Motherboard Replacement: step 9, image 2 of 2

    • Continuing from step 2, on the right side of the computer, use the opening tool to gently lift the black flap up and pull the second display cable connector out of the socket.

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  11. Lenovo ThinkPad L390 Motherboard Replacement: step 10, image 1 of 3 Lenovo ThinkPad L390 Motherboard Replacement: step 10, image 2 of 3 Lenovo ThinkPad L390 Motherboard Replacement: step 10, image 3 of 3

    • Gently pull the black and grey coaxial connectors from the Wi-Fi card.

    • Pull both connectors towards the right to unhook them from the metal hook located on the left side of the SSD card.

    • Pull the connectors towards the left to unhook them from the second metal hook.

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  12. Lenovo ThinkPad L390 Motherboard Replacement: step 11, image 1 of 1

    • Remove the four 4mm #00 phillips screws securing the motherboard.

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  13. Lenovo ThinkPad L390 Motherboard Replacement: step 12, image 1 of 3 Lenovo ThinkPad L390 Motherboard Replacement: step 12, image 2 of 3 Lenovo ThinkPad L390 Motherboard Replacement: step 12, image 3 of 3

    • Gently lift the black tab with a opening tool.

    • Gently "walk" the connector out of the socket as shown in step 3.

    • Gently lift the black tab with a opening tool.

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  14. Lenovo ThinkPad L390 Motherboard Replacement: step 13, image 1 of 2 Lenovo ThinkPad L390 Motherboard Replacement: step 13, image 2 of 2

    • Using the opening tool gently pry the top part of the motherboard up.

    • The motherboard may seem stuck at first but a little bit of force may be necessary in order to get the motherboard out.

    Edit
Conclusion

To reassemble your device, follow these instructions in reverse order.

Author

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Subah Shabnam

Member since: 02/24/25

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Austin Community College, Team 22-2, Watkins Summer 2025 Member of Austin Community College, Team 22-2, Watkins Summer 2025

AUSTINCC-WATKINS-SU25S22G2

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