Confirm you have an iMac 21.5" Non-Retina (2012–2017) — check the label on the bottom of the stand. Place the iMac screen-down on a soft surface like a towel or foam pad to protect the glass.

Using the included display adhesive cutter, carefully slice through the adhesive tape around the entire perimeter of the glass. Apple used adhesive to secure the front display panel on these models — work all the way around before lifting.

Gently lift the display panel — do not pull it too far yet, as it is still connected by two cables. Disconnect the display data cable (eDP connector) and the backlight power cable. Once disconnected, carefully set the display panel aside — this is the panel you will reuse as your new monitor.

Remove all internal hardware that is no longer needed:

• Hard drive and its bracket
• Power supply unit
• Cooling fans
• Logic board (motherboard)
• Speakers (optional)

Use T8 and T10 Torx screwdrivers. Keep track of your screws and remove cables gently to avoid damaging the frame. Speakers can remain if they do not interfere with mounting.

Before installing, familiarise yourself with the driver board components and which ports you will be using during installation.

Identify the key ports on the board: the eDP connector, backlight power socket, DisplayPort input, and DC power jack. All connections must be made for the display to function correctly.

1. Disconnect the built-in eDP cable from the iMac display panel.
2. Connect the new eDP cable from the kit to the driver board and to the display.
3. Attach the backlight power cable to both the board and the display.
4. Connect the controller board and plug in the DisplayPort and power cable.
5. Verify all connections are fully seated before proceeding.

Locate the power port assembly inside the enclosure. Remove the securing screw, then carefully use a flat-head screwdriver to pry the port away from the chassis. The port is held with strong adhesive — apply steady, firm pressure to break the bond and extract it cleanly.

Use double-sided tape to secure the display driver board inside the iMac housing. Mount the controller board at the back of the chassis or near the power adapter location for easy access to the DisplayPort and power ports.

Before closing the unit, run a test:

1. Power on the board and wait for the green indicator light.
2. Connect the controller board to your computer using the DisplayPort to USB-C cable.
3. Plug in the power supply and turn the display on.
4. Use the OSD buttons on the controller board to select the correct input if needed.

If everything is connected correctly, the iMac panel should power up and show your computer's display.

Once confirmed working:

• Route all wires neatly inside the chassis using cable ties where needed.
• Secure the controller board and OSD button board with double-sided tape.
• Reattach the glass panel using the supplied adhesive strips.

Your iMac 21.5" is now a fully functional external monitor. Note: the DisplayPort-to-USB-C cable and power adapter will remain outside the iMac.

If the OSD menu appears in a non-English language, use the following sequence to switch to English:

Menu → Down (6 times) → Menu (3 times)

After completing this, the menu language will be set to English.