ThinkPad T420 Memory Replacement

はじめに

If your Lenovo T420 is running slowly, complaining about memory usage or does not boot up correctly, the problem may be related to a faulty memory module. This guide will show you how to replace both memory modules in your system.

Note: If you need to access the factory memory module, the keyboard has to be removed. Keyboard removal is not required for the bottom module.

Guide notes

Use of a matched pair of memory modules is recommended. Mixing and matching modules works, but may cause system instability. My mixed pair seems to work, but I've had two blue screens and I suspect this isn't the last time it'll happen (errors are not related to memory, but memory is suspect). If you mix and match modules, run Memtest 86+ for ~8 hours and test for stability.
It is important that you do not lose the silver keyboard screw. The RAM door screw also holds the keyboard in, so this isn't the end of the world. However, your keyboard be noticeably loose.

必要な工具と部品

手順1 Remove the battery

ThinkPad T420 Memory Replacement, Remove the battery: 手順 1、 3の画像 1

ThinkPad T420 Memory Replacement, Remove the battery: 手順 1、 3の画像 2

ThinkPad T420 Memory Replacement, Remove the battery: 手順 1、 3の画像 3

Remove the battery from the system. To do this, push the locking tab into the unlocked position.
Once the battery is unlocked, hold the locking tab in and push the battery out.

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手順2 Accessing the lower memory module

ThinkPad T420 Memory Replacement, Accessing the lower memory module: 手順 2、 3の画像 1

ThinkPad T420 Memory Replacement, Accessing the lower memory module: 手順 2、 3の画像 2

ThinkPad T420 Memory Replacement, Accessing the lower memory module: 手順 2、 3の画像 3

To remove the bottom memory module, open the memory door. Use a Phillps #0 screwdriver.

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手順3 Remove the bottom memory module

ThinkPad T420 Memory Replacement, Remove the bottom memory module: 手順 3、 3の画像 1

ThinkPad T420 Memory Replacement, Remove the bottom memory module: 手順 3、 3の画像 2

ThinkPad T420 Memory Replacement, Remove the bottom memory module: 手順 3、 3の画像 3

With the bottom RAM door removed, release the bottom memory module. Release both locking tabs and the module can be removed.

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手順4 Accessing the upper memory module

ThinkPad T420 Memory Replacement, Accessing the upper memory module: 手順 4、 2の画像 1

ThinkPad T420 Memory Replacement, Accessing the upper memory module: 手順 4、 2の画像 2

To access the memory module under the keyboard, remove the silver screw securing the keyboard.

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手順5 Remove the keyboard

ThinkPad T420 Memory Replacement, Remove the keyboard: 手順 5、 3の画像 1

ThinkPad T420 Memory Replacement, Remove the keyboard: 手順 5、 3の画像 2

ThinkPad T420 Memory Replacement, Remove the keyboard: 手順 5、 3の画像 3

To remove the keyboard, push up from the bottom first. Once the lower tabs are released, use a plastic pry tool to lift the keyboard up.

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手順6 Disconnect the keyboard

ThinkPad T420 Memory Replacement, Disconnect the keyboard: 手順 6、 3の画像 1

ThinkPad T420 Memory Replacement, Disconnect the keyboard: 手順 6、 3の画像 2

ThinkPad T420 Memory Replacement, Disconnect the keyboard: 手順 6、 3の画像 3

Once the keyboard is removed, disconnect the cable from the motherboard. Use a plastic pry tool.

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手順7 Remove the RAM module

ThinkPad T420 Memory Replacement, Remove the RAM module: 手順 7、 3の画像 1

ThinkPad T420 Memory Replacement, Remove the RAM module: 手順 7、 3の画像 2

ThinkPad T420 Memory Replacement, Remove the RAM module: 手順 7、 3の画像 3

To remove the RAM module, follow the removal procedure from the bottom lower module.

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手順8 Keyboard reinstallation

ThinkPad T420 Memory Replacement, Keyboard reinstallation: 手順 8、 3の画像 1

ThinkPad T420 Memory Replacement, Keyboard reinstallation: 手順 8、 3の画像 2

ThinkPad T420 Memory Replacement, Keyboard reinstallation: 手順 8、 3の画像 3

This step only applies if you removed the RAM module under the keyboard. If you did not remove it, you can skip this step.
To reinstall the keyboard, push the top of the keyboard in first. Once the top is pushed in, slide the keyboard down to secure it. Screw the keyboard back in.

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