Lenovo ThinkPad T420s Repair

Lenovo ThinkPad T420s

The slimmer version of the bulkier ThinkPad T420. The T420s is notable for its lower battery life and noisier fan compared to the original T420 laptop.

Keyboard Replacement

Introduction

Lenovo ThinkPad T420s Keyboard Replacement

If you are experiencing sticky, unresponsive keys, you may need a new keyboard. This guide shows you how to replace your laptop's keyboard.

Step 1

Lenovo ThinkPad T420s Keyboard Replacement
  • Flip your laptop over so the bottom is facing up.
  • Remove the memory panel by removing two black 5mm screws using the Phillips #0.
  • Remove the memory panel.

Step 2

Lenovo ThinkPad T420s Keyboard Replacement
  • Remove the two 5mm screw using the Phillips #0 screwdriver.
  • Flip the laptop back over and open it.

Step 3

Lenovo ThinkPad T420s Keyboard Replacement
  • Gently push down on the keyboard and slide it towards the screen. This will pop the bottom of the keyboard out of the casing.
  • The best place to push is on the frame of the keyboard by the power button.
  • Using the metal spudger, lift and slide out the keyboard.

Step 4

Lenovo ThinkPad T420s Keyboard Replacement
  • Remove the orange cable by lifting up on the tab on the end of the ribbon connection.

LCD Replacement

Introduction

LCD Replacement - Lenovo ThinkPad T420s

If your screen is damaged or not working properly, you can use this guide to replace the LCD unit on your laptop.

Step 1

LCD Replacement - Lenovo ThinkPad T420s
  • Flip your laptop over so the bottom is facing up.
  • Remove the memory panel by removing two black 5mm screws using the Phillips #0. Remove the memory panel.

Step 2

LCD Replacement - Lenovo ThinkPad T420s
  • Remove the two 5mm screw using the Phillips #0 screwdriver.
  • Flip the laptop back over and open it.

Step 3

LCD Replacement - Lenovo ThinkPad T420s
  • Gently push down on the keyboard and slide it towards the screen. This will pop the bottom of the keyboard out of the casing.
  • The best place to push is on the frame of the keyboard by the power button.
  • Using the metal spudger, lift and slide out the keyboard.

Step 4

LCD Replacement - Lenovo ThinkPad T420s
  • Remove the orange cable by lifting up on the tab on the end of the ribbon connection.

Step 5

LCD Replacement - Lenovo ThinkPad T420s
  • Remove the additional thirteen 5 mm screws with your Phillips #0 screwdriver.
  • Remove the two 2.5 X 5 mm screws from the back of your laptop.
  • 2.5 X 5 mm screws are slightly larger than the 5 mm screws.
  • Remove the 3 mm screw from the back of the laptop using the same screwdriver.

Step 6

LCD Replacement - Lenovo ThinkPad T420s
  • Disconnect the black and gray antenna cable connectors in the memory panel on the back of the laptop.
  • Remove any plastic wraps on the blue, white, and tan wires.

Step 7

LCD Replacement - Lenovo ThinkPad T420s
  • Flip the laptop back over and pull all the wires from the previous step through to the top side.

Step 8

LCD Replacement - Lenovo ThinkPad T420s
  • Remove the three 5mm screws holding the palm rest casing in place using the Phillips #0.

Step 9

LCD Replacement - Lenovo ThinkPad T420s
  • Unplug the red, white, and blue bunch of wires.

Step 10

LCD Replacement - Lenovo ThinkPad T420s
  • Lift up the black retaining flap holding the purple ribbon cable in place, and carefully slide out the ribbon.

Step 11

LCD Replacement - Lenovo ThinkPad T420s
  • Remove the top casing by lifting up and sliding out.

Step 12

LCD Replacement - Lenovo ThinkPad T420s
  • Unplug the two black cables that connect the screen to the motherboard.

Step 13

LCD Replacement - Lenovo ThinkPad T420s
  • Flip your laptop so the back-side is facing towards you.
  • Remove any black stickers covering the screws using the nylon or metal spudger.
  • Remove the two 7mm screws using the Phillips #0 screwdriver.

Step 14

LCD Replacement - Lenovo ThinkPad T420s
  • Remove the LCD screen unit by holding the sides and lifting it upwards.

Palm Rest Replacement

Introduction

Palm Rest Replacement - Lenovo ThinkPad T420s

If you are experiencing problems with your speakers or touchpad, you can replace these parts by replacing the entire palm rest component of your laptop.

Step 1

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Flip your laptop over so the bottom is facing up.
  • Remove the memory panel by removing two black 5mm screws using the Phillips #0. Remove the memory panel.

Step 2

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Remove the two 5mm screw using the Phillips #0 screwdriver.
  • Flip the laptop back over and open it.

Step 3

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Gently push down on the keyboard and slide it towards the screen. This will pop the bottom of the keyboard out of the casing.
  • Using the metal spudger, lift and slide out the keyboard.
  • When lifting the keyboard do not remove it completely because a cable will still be connected to the laptop.

Step 4

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Remove the orange cable by lifting up on the tab on the end of the ribbon connection.

Step 5

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Remove the additional thirteen 5 mm screws with your Phillips #0 screwdriver.
  • Remove the two 2.5 X 5 mm screws from the back of your laptop.
  • 2.5 X 5 mm screws are slightly larger than the 5 mm screws.
  • Remove the 3 mm screw from the back of the laptop using the same screwdriver.

Step 6

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Disconnect the black and gray antenna cable connectors in the memory panel on the back of the laptop.
  • Remove any plastic wraps on the blue, white, and tan wires.

Step 7

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Flip the laptop back over and pull all the wires from the previous step through to the top side.

Step 8

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Remove the three 5mm screws holding the palm rest casing in place using the Phillips #0.

Step 9

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Unplug the red, white, and blue bunch of wires.

Step 10

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Lift up the black retaining flap holding the purple ribbon cable in place, and carefully slide out the ribbon.

Step 11

Palm Rest Replacement - Lenovo ThinkPad T420s
  • Remove the top casing by lifting up and sliding out.

Power Jack Replacement

Introduction

Power Jack Replacement - Lenovo ThinkPad T420s

If your laptop is not charging correctly you can replace the power jack using this guide.

Step 1

Power Jack Replacement - Lenovo ThinkPad T420s
  • Flip your laptop over so the bottom is facing up.
  • Remove the memory panel by removing two black 5mm screws using the Phillips #0.
  • Remove the memory panel.

Step 2

Power Jack Replacement - Lenovo ThinkPad T420s
  • Remove the two 5mm screw using the Phillips #0 screwdriver.
  • Flip the laptop back over and open it.

Step 3

Power Jack Replacement - Lenovo ThinkPad T420s
  • Gently push down on the keyboard and slide it towards the screen. This will pop the bottom of the keyboard out of the casing.
  • Using the metal spudger, lift and slide out the keyboard.
  • When lifting the keyboard do not remove it completely because a cable will still be connected to the laptop.

Step 4

Power Jack Replacement - Lenovo ThinkPad T420s
  • Remove the orange cable by lifting up on the tab on the end of the ribbon connection.

Step 5

Power Jack Replacement - Lenovo ThinkPad T420s
  • Remove the additional thirteen 5 mm screws with your Phillips #0 screwdriver.
  • Remove the two 2.5 X 5 mm screws from the back of your laptop.
  • 2.5 X 5 mm screws are slightly larger than the 5 mm screws.
  • Remove the 3 mm screw from the back of the laptop using the same screwdriver.

Step 6

Power Jack Replacement - Lenovo ThinkPad T420s
  • Disconnect the black and gray antenna cable connectors in the memory panel on the back of the laptop.
  • Remove any plastic wraps on the blue, white, and tan wires.

Step 7

Power Jack Replacement - Lenovo ThinkPad T420s
  • Flip the laptop back over and pull all the wires from the previous step through to the top side.

Step 8

Power Jack Replacement - Lenovo ThinkPad T420s
  • Remove the three 5mm screws holding the palm rest casing in place using the Phillips #0.

Step 9

Power Jack Replacement - Lenovo ThinkPad T420s
  • Unplug the red, white, and blue bunch of wires.

Step 10

Power Jack Replacement - Lenovo ThinkPad T420s
  • Lift up the black retaining flap holding the purple ribbon cable in place, and carefully slide out the ribbon.

Step 11

Power Jack Replacement - Lenovo ThinkPad T420s
  • Remove the top casing by lifting up and sliding out.

Step 12

Power Jack Replacement - Lenovo ThinkPad T420s
  • Unplug the two black cables that connect the screen to the motherboard.

Step 13

Power Jack Replacement - Lenovo ThinkPad T420s
  • Flip your laptop so the back-side is facing towards you.
  • Remove any black stickers covering the screws using the nylon or metal spudger.
  • Remove the two 7mm screws using the Phillips #0 screwdriver.

Step 14

Power Jack Replacement - Lenovo ThinkPad T420s
  • Remove the LCD screen unit by holding the sides and lifting it upwards.

Step 15

Power Jack Replacement - Lenovo ThinkPad T420s
  • Remove the 3mm screw next to the power jack using the Phillips #0.
  • Once the screw is removed, the power jack should pop up.

Step 16

Power Jack Replacement - Lenovo ThinkPad T420s
  • Lift the power jack and slide to the right to remove.

RAM Replacement

Introduction

RAM Replacement - Lenovo ThinkPad T420s

If you're looking for a boost in performance, you may want to upgrade your RAM. If you have inadequate amounts of RAM, some of the processes could be handed to the hard drive, slowing your machine immensely. Depending on your use, a replacement or upgrade in RAM could increase system performance. More RAM allows for multiple processes to be ran quickly and efficiently.

Step 1

RAM Replacement - Lenovo ThinkPad T420s
  • Flip over the laptop so the bottom is facing up.
  • Unscrew the two black 5mm screws on the memory panel with your Phillips #0 screwdriver.
  • These screws are attached to the panel and are not made to be removed.

Step 2

RAM Replacement - Lenovo ThinkPad T420s
  • Push the metal clips away from the RAM.
  • Slide out and lift the RAM.