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Introdução

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.
  1. 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. Once the battery is unlocked, hold the locking tab in and push the battery out.
    • 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.

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

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

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

  5. 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. 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. 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.
    • 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.

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

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

  8. 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. 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.
    • 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.

Conclusão

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

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Nick

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What tool might one use as a pry?

commander - Responder

The plastic pry tool will also work for the bottom RAM/mSATA part. I can usually get it open without the assistance of pry tools.

Nick -

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