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Accessing Apple Cinema Display M8149 Control Boards

Introduction

If your Apple Cinema Display M8149 control board isn't sending signals—leading to system crashes—use this guide to replace the faulty control board.

The control board is an essential part of the display as it is the component that acts as the nerve center that the CPU sends signals through. When those signals aren't being processed by the control board, that can cause the system to crash.

Before starting the steps be sure to power off the display and disconnect it from any external power source.

What you need

  1. Accessing Apple Cinema Display M8149 Control Boards, Control Boards: step 1, image 1 of 3 Accessing Apple Cinema Display M8149 Control Boards, Control Boards: step 1, image 2 of 3 Accessing Apple Cinema Display M8149 Control Boards, Control Boards: step 1, image 3 of 3

    • Before starting, make sure the display is unplugged.

    • Place the Cinema Display so that it is lying on its face and the feet are pointed away from you.

    • Remove the three screws (9.52 x 4.43mm) that connect the back foot to the hinge using the Hex Key.

    • Remove the back foot from the hinge mount by grabbing the foot and pulling upwards.

    Edit

  2. Accessing Apple Cinema Display M8149 Control Boards: step 2, image 1 of 3 Accessing Apple Cinema Display M8149 Control Boards: step 2, image 2 of 3 Accessing Apple Cinema Display M8149 Control Boards: step 2, image 3 of 3

    • Remove the eighteen (5.25 x 4.43 mm) screws around the edge of the backplate using the Hex key.

    • Disconnect the small white connector leading to the display's Power button.

    • Gently lift the backplate off of the display. Completely remove the backplate and set it aside.

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  4. Accessing Apple Cinema Display M8149 Control Boards: step 3, image 1 of 2 Accessing Apple Cinema Display M8149 Control Boards: step 3, image 2 of 2

    • Use a Phillips #2 screwdriver to remove the four (9.52 x 3.43 mm) screws on the outer rim of the metal cover.

    • Next, remove the four cover (11.91 x 2.89 mm) screws located at the corners of the metal cover using the Phillips #2 screwdriver.

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  5. Accessing Apple Cinema Display M8149 Control Boards: step 4, image 1 of 3 Accessing Apple Cinema Display M8149 Control Boards: step 4, image 2 of 3 Accessing Apple Cinema Display M8149 Control Boards: step 4, image 3 of 3

    • Unplug the large brown plug in the center-right, that connects the control board to the rest of the display.

    • Unplug the blue and gray plug on the right side of the control board. Repeat with the left side.

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  6. Accessing Apple Cinema Display M8149 Control Boards: step 5, image 1 of 2 Accessing Apple Cinema Display M8149 Control Boards: step 5, image 2 of 2

    • Gently lift the large metal cover which spans across the back of the whole display.

    Edit
Conclusion

To reassemble your device, follow these instructions in reverse order.

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Brett Murphy

Member since: 04/01/11

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Cal Poly, Team 10-41, Forte Spring 2011 Member of Cal Poly, Team 10-41, Forte Spring 2011

CPSU-FORTE-S11S10G41

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1 Guide Comment

thank you for this guide. my 22" adc didn't want to start up. after following this guide, it now works with my G4. thank you

thereddrag0n - Reply Share

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