.. include:: /urls.rst

.. _l14_mainboard_replacement:

Mainboard replacement
=====================


.. _l14_mainboard_replacement_summary:

Summary
-------

.. raw:: html

    <video width="80%" controls>
        <source src="https://videos.puri.sm/promo/part2_v4_1080p.mp4" type="video/mp4">
        <source src="https://videos.puri.sm/promo/part2_v4_1080p" type="video/webm">
        Your browser does not support HTML video.
    </video>

.. seealso::
   * :download:`Download <https://videos.puri.sm/promo/part2_v4_1080p.mp4>` the video
   * `Original blog post <blog_l14_repair_pt2_>`_


.. _l14_mainboard_disassembly:

Mainboard disassembly
---------------------

#. :ref:`Remove the D-shell <l14_disassembly_d-shell>`.
#. :ref:`Remove all RAM modules <l14_disassembly_ram>`.
#. :ref:`Remove the M.2 SSD <l14_disassembly_m2>`.
#. :ref:`Remove the WLAN module <l14_disassembly_wlan>`.
#. Pull up the tape holding down the BIOS battery and remove it.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h42m48s751.png
      :scale: 50%
      :alt: L14 BIOS tape removal
      :class: no-scaled-link

#. Disconnect the keyboard by pulling up on this black tab and removing the ribbon cable.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h43m23s854.png
      :scale: 50%
      :alt: Disconnect L14 keyboard connector
      :class: no-scaled-link

#. Push these black tabs towards the ribbon cable, then disconnect them to detach the keyboard backlight.

   .. image:: /_files/L14/internal/15-1024x576.png
      :scale: 50%
      :alt: Disconnect L14 keyboard backlight connector
      :class: no-scaled-link

#. Similar to the keyboard, the trackpad connection is removed by lifting the black tab and pulling out the ribbon cable.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h44m43s752-1024x576.png
      :scale: 50%
      :alt: Disconnect L14 trackpad connector
      :class: no-scaled-link

#. Remove both speaker connections by pulling the connector directly outward from the socket, toward the direciton of the cable.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h45m07s133-1024x576.png
      :scale: 50%
      :alt: Disconnect L14 speaker connectors
      :class: no-scaled-link

#. Disconnect the CPU fans in a the same way as the speaker connectors.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h45m29s305-1024x576.png
      :scale: 50%
      :alt: Disconnect L14 CPU fan connectors
      :class: no-scaled-link

#. Pull up the tape around the display connector.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h46m06s785-1024x576.png
      :scale: 50%
      :alt: L14 display tape removal
      :class: no-scaled-link

#. Lift the black tab and remove the display cable.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h46m24s117-1024x576.png
      :scale: 50%
      :alt: Disconnect L14 display cable
      :class: no-scaled-link

#. Remove the Ethernet port by removing two screws.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h46m43s464-1024x576.png
      :scale: 50%
      :alt: Disconnect Ethernet port
      :class: no-scaled-link

#. Unscrew both fans.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h47m01s413-1024x576.png
      :scale: 50%
      :alt: L14 CPU fan removal
      :class: no-scaled-link

#. Unscrew each of the four heatsink screws by a quarter turn in a criss-cross pattern until the CPU heatsink is freed.
   This pattern helps equalize pressure on the CPU and GPU.

   .. image:: /_files/L14/internal/16-1024x576.png
      :scale: 50%
      :alt: L14 CPU heatsink removal
      :class: no-scaled-link

#. Remove these three screws to detach the mainboard from the chassis.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h48m22s910-1024x576.png
      :scale: 50%
      :alt: L14 mainboard screw removal
      :class: no-scaled-link

#. Carefully remove the mainboard from the chassis.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h49m30s948-1024x576.png
      :scale: 50%
      :alt: L14 mainboard removal
      :class: no-scaled-link


.. _l14_mainboard_reassembly:

Mainboard reassembly
--------------------

#. Carefully place the motherboard into the chassis.
   Ensure the mainboard is not covering any loose cables.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h51m46s393-1024x576.png
      :scale: 50%
      :alt: L14 mainboard replacement
      :class: no-scaled-link

#. With the board laying flat, screw-down its three screws.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h52m01s400-1024x576.png
      :scale: 50%
      :alt: L14 mainboard screw replacement
      :class: no-scaled-link

#. Wipe off the thermal compound from the CPU.
   Apply fresh thermal compound using the manufacturer's instructions.
   Use the image as a guide.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h52m26s613-1024x576.png
      :scale: 50%
      :alt: L14 CPU thermal compound
      :class: no-scaled-link

#. Carefully align the heatsink and use the same criss-cross pattern to secure the CPU to the mainboard.
   Make sure to use small turns and do not over-tighten these.

   .. image:: /_files/L14/internal/17-1024x576.png
      :scale: 50%
      :alt: L14 CPU heatsink replacement
      :class: no-scaled-link

#. Screw down the heatsink fans.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h53m28s008-1024x576.png
      :scale: 50%
      :alt: L14 CPU heatsink fan replacement
      :class: no-scaled-link

#. Reattach the monitor display cable and flatten the tape.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h53m52s732-1024x576.png
      :scale: 50%
      :alt: L14 display connector replacement
      :class: no-scaled-link

#. Connect the onboard BIOS battery.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h54m05s455-1024x576.png
      :scale: 50%
      :alt: L14 BIOS battery replacement
      :class: no-scaled-link

#. Reattach the speakers.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h54m20s260-1024x576.png
      :scale: 50%
      :alt: L14 speaker connector replacement
      :class: no-scaled-link

#. Carefully insert and clamp down the trackpad ribbon cable.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h54m28s126-1024x576.png
      :scale: 50%
      :alt: L14 trackpad connector replacement
      :class: no-scaled-link

#. Connect the keyboard backlight.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h55m03s820-1024x576.png
      :scale: 50%
      :alt: L14 keyboard backlight connector replacement
      :class: no-scaled-link

#. Connect the keyboard.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h55m18s354-1024x576.png
      :scale: 50%
      :alt: L14 keyboard connector replacement
      :class: no-scaled-link

#. Connect the CPU heatsink fans.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h55m30s000-1024x576.png
      :scale: 50%
      :alt: L14 CPU heatsink fan connector replacement
      :class: no-scaled-link

#. Reattach the Ethernet port.

   .. image:: /_files/L14/internal/vlcsnap-2022-02-09-11h55m45s536-1024x576.png
      :scale: 50%
      :alt: L14 Ethernet port replacement
      :class: no-scaled-link

#. :ref:`Reconnect the SSD <l14_disassembly_m2>`.
#. :ref:`Reconnect the WLAN module <l14_disassembly_wlan>`.
#. :ref:`Reconnect the RAM module(s) <l14_disassembly_ram>`.
#. :ref:`Reconnect the battery <l14_battery>`.
#. :ref:`Reattach the D-shell <l14_disassembly_d-shell>`.