• 1 Raspberry Pi Compute Module 4 (CM4)
• 1 heat sink
• 2 thermal pads
• 2 push pins

Grounding protects the components from the static electricity that can be naturally present (electrostatic discharge, ESD).

• Notice: Risk of damage to the equipment due to electrostatic discharge. Always: Touch the working surface before touching electronics.
• Ideally: Use ESD protective equipment, such as ESD table mats and grounding cords.

• Remove the 4 screws on the bottom of the Home Assistant Yellow Kit.
• Keep the thumb screws close by; you will need them again later.

• Make sure the interfaces are facing towards your left.
• Flip the case over.
• Slightly lift off the enclosure on your left.
• Slide the enclosure off towards your right.

• Make sure you have all the components:
• 1 Raspberry Pi Compute Module 4 (CM4)
• 1 heat sink
• 2 thermal pads
• 2 push pins

• Place the board in front of you, the connectors facing to the right.
• Orient the CM4: The CE mark needs to be on the bottom.
• Use the outline of the chips to help find the correct orientation of the CM4. Note: on CM4 Lite variants, the chips on the bottom edge are in a different location.
• Carefully place the CM4 without force.
• The CM4 should fall into place slightly when correctly aligned.

• Press the CM4 board onto the board-to-board connectors until it clicks into place.
• Make sure you press on both sides (the two long edges).
• This requires quite a bit of force. If you don't hear a loud click, it is most likely not fully seated.
• Do a visual check to make sure the CM4 is installed correctly: it needs to run parallel to the Home Assistant Yellow board.

• Remove the protective cover from one side of the square thermal pad.
• Stick the unprotected side onto the SOC (the silver square next to the raspberry icon).
• Remove the protective cover from the top side of the thermal pad.
• Repeat the steps with the rectangular thermal pad. Place it on the memory (the black rectangle next to the SOC).

• Push the 2 plastic push pins into the dedicated hole on the heat sink.
• Start by first aligning the right plastic push pins into the dedicated hole on the carrier board.
• Then, place the heat sink onto the CM4.

• Take the entire board off your workplace and push the pins firmly through the carrier board.
• Ensure that the CM4 is still fully seated after securing the heat sink.

• Place the translucent bottom part of the case onto the table.
• Make sure the two round notches form a line pointing towards the top right corner.

• Place the board onto the bottom part of the case.
• Make sure the USB connectors are facing upwards, away from you.

• Turn the enclosure upside down.
• Then, slide the push buttons into the openings of the case.

• Insert the 4 thumb screws.
• Notice: Risk of damage to the equipment due to excessive force. Do not over-tighten the screws.