Complete disassembly of Lenovo Y50-70 model 20378

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Lenovo Y50-70 model 20378 disassembly guide

In this guide I will walk you through the process of complete disassembly of Lenovo Y50-70 (model 20378) laptop.There will be two parts in this disassembly guide.

  1. Taking apart the laptop case. I will show how to access and remove all internal components.
  2. Taking apart the display panel. I will show how to remove and replace the LCD screen.

These two parts are independent from each other and if all you need is to replace the screen, you can jump straight to the second part.

Part 1. Taking apart Lenovo Y50-70 laptop case.


Remove all screws securing the bottom cover.

Remove all screws from laptop bottom


Lift up the cover and remove it.

Remove bottom cover


Remove three screws securing the battery and disconnect the cable from the motherboard.

Remove the battery.

Replacement batteries model L13M4P02 available here:

Disconnect and remove battery


Remove four screws from the hard drive caddy and disconnect the SATA cable from the motherboard.

Remove the hard drive assembly.

Disconnect and remove hard drive


If you are replacing the hard drive or upgrading it, you will have to transfer the caddy and the cable to the new one.

Transfer caddy and cable to new hard drive


Lenovo Y50-70 laptop has two removable memory modules. Remove both modules if necessary.

Remove both memory modules


Disconnect the subwoofer cable (red square).

Disconnect the speaker cable (yellow square).

Disconnect two antenna cables (red arrows) from the wireless card. You can leave the wireless card connected to the motherboard unless you have to replace it.

Disconnect speaker and wireless card cables


Un-route cables from the left side of the cooling fans assembly.

Remove three screws securing the dual fan assembly.

Remove screws from cooling fan assembly


Remove the cooling fan assembly.

New fan assemblies available here:

Remove dual cooling fan assembly

STEP 10.

Remove two screw securing the subwoofer and remove it from the laptop.

Remove subwoofer

STEP 11.

Remove two screws from the USB Audio SD card reader board.

Disconnect the board cable from the motherboard.

Disconnect USB Audio SD card reader board

STEP 12.

Remove the USB Audio SD card reader board.

Replacement USB boards available here:

Remove USB Audio SD card reader board

STEP 13.

Remove six spring loaded screws fastening the heatsink.

You cannot remove the motherboard without removing the heatsink first.

Remove spring loaded screws from heatsink

STEP 14.

Remove the heatsink.

Remove heatsink

STEP 15.

Disconnect the following cables from the motherboard:

  • Power button board cable (red square)
  • Touchpad cable (orange square)
  • Keyboard backlight cable (purple square)
  • Keyboard data cable (yellow rectangular)
  • LED status board cable (green square)
  • DC-IN power jack cable (blue square)
  • LCD screen video cable (violet square)
Disconnect cables from motherboard

Here’s how to release flat cables:

  1. Unlock the connector by lifting up the locking tab.
  2. Pull the cable out of the connector.
How to release flat cables

STEP 16.

Remove five screws attaching the motherboard to the top case.

Remove five screws fastening motherboard

STEP 17.

Remove the motherboard from the case.

Remove motherboard from laptop case

Here’s a picture of the other side just in case you need it.

Replacement motherboards available here:

Other side of motherboard

STEP 18.

The touchpad can be removed after you remove three screws from the metal bracket and two more from the touchpad itself.

The keyboard is permanently attached to the top case and cannot be easily removed. If the keyboard failed, you will have to replace the entire top case or try this repair.

Replacement palmrest/keyboards assembles available here:

Remove touchpad

STEP 19.

The LED status board is hidden under the adhesive shielding. The LED board is secured by one screw and can be removed if necessary.

Access LED status board

STEP 20.

The power button board also accessible and removable.

Access power button board

STEP 21.

The DC-IN power jack harness is routed along the side of the top case.

Replacement DC jacks available here:

Access DC-IN power jack harness

Part 2. Removing Lenovo Y50-70 LCD screen.

The LCD screen can be easily removed and replaced on these models.

Removing Lenovo Y50-70 LCD screen


Start the display disassembly from the top side.

Insert your fingers between the front bezel and LCD screen and separate the bezel from the back cover.

Separate front bezel from LCD screen


Continue removing the bezel on both sides of the display.

Continue removing bezel on both display sides


Remove the front bezel from the display.

Remove display bezel


Remove four screws attaching the LCD screen to the back cover.

Remove four screws securing LCD screen


Separate the LCD screen from the back cover.

Separate LCD screen from back cover


Place the LCD screen the front side down on the keyboard.

Now you can access the video cable connector on the back.

Access video cable connector on back of LCD


Peel of the clear tape securing the connection.

Unplug the video cable from the LCD screen.

Disconnect video cable from LCD screen

Now you can replace the LCD screen with a new one.

You can find a new screen using the model number or Lenovo FRU number printed on the back.

In my case the model number: N156HGE-EAB Rev. C1 and Lenovo FRU part number: 04X4813

Replacement LCD screens available here:

Replace Lenovo Y50-70 LCD screen

6 Responses

  1. Elia

    Hi! A small piece of magnet fell off while disassembling a lenovo y50-70 for keyboard replacement. I guess it’s needed by the lid closure sensor but I cannot figure out where it was positioned. Any ideas?

  2. Evelyn

    @ Elia ^ that probably is from the upper case, screen bezel ­čÖé there should be two tiny magnets, one on top and one on bottom. You should be able to google pics for where

  3. Ibrahim

    What is the harness that is aligned along the upper case of the laptop? Is it the camera. Because I tore mine in half by mistake?

    • IML Tech

      If you are asking about the cable inside the display panel, along the left side of the LCD screen, it’s the webcam cable.

        • IML Tech

          The webcam cable is a part of the display cable harness. It’s necessary to separate the display panel from the laptop base in order to replace the cable/harness. You’ll have to disassemble the laptop as shown in the step 18. After that you can remove screws from the display hinges and separate the display from the base.
          When the display is removed, you take it apart and replace the display harness with the webcam cable.