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Samsung Galaxy Watch4 Motherboard Replacement

What you need

  1. Samsung Galaxy Watch4  Motherboard Replacement, Power down your Galaxy Watch4: step 1, image 1 of 1
    • Before starting repairs, take your watch off the charger and power it down.

    • Remove the watch band.

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  2. Samsung Galaxy Watch4  Motherboard Replacement, Unscrew the back cover: step 2, image 1 of 1
    • Use a Tri-point Y00 screwdriver to remove the four 4.0 mm-long screws.

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  3. Samsung Galaxy Watch4  Motherboard Replacement, Wedge open the back cover: step 3, image 1 of 2 Samsung Galaxy Watch4  Motherboard Replacement, Wedge open the back cover: step 3, image 2 of 2
    • Insert an opening tool into the seam between the back cover and the metal housing.

    • Twist the opening tool to create a gap.

    • Don't try to remove the back cover all the way yet. The sensor flex cable is still connected to the motherboard.

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  4. Samsung Galaxy Watch4  Motherboard Replacement, Disconnect the sensor flex cable: step 4, image 1 of 2 Samsung Galaxy Watch4  Motherboard Replacement, Disconnect the sensor flex cable: step 4, image 2 of 2
    • Lay the watch face down.

    • Carefully swing open the back cover by folding the back cover to the opposite site of the created gap.

    • Use the flat end of a spudger to pry up and disconnect the sensor flex cable from the motherboard.

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  5. Samsung Galaxy Watch4  Motherboard Replacement, Remove the back cover: step 5, image 1 of 1
    • Remove the back cover.

    • Make sure the rubber gasket is undamaged. If damaged, replace it with a new one during reassembly to maintain proper water resistance.

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  6. Samsung Galaxy Watch4  Motherboard Replacement, Unscrew the motherboard: step 6, image 1 of 1
    • Use a Phillips screwdriver to remove the 4.4 mm-long screw securing the motherboard.

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  7. Samsung Galaxy Watch4  Motherboard Replacement, Disconnect the display flex cable: step 7, image 1 of 2 Samsung Galaxy Watch4  Motherboard Replacement, Disconnect the display flex cable: step 7, image 2 of 2
    • Use the flat end of a spudger to disconnect the display flex cable.

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  8. Samsung Galaxy Watch4  Motherboard Replacement, Disconnect the side buttons: step 8, image 1 of 2 Samsung Galaxy Watch4  Motherboard Replacement, Disconnect the side buttons: step 8, image 2 of 2
    • Use a spudger to disconnect the flex cable of the crown buttons.

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  9. Samsung Galaxy Watch4  Motherboard Replacement, Remove the motherboard: step 9, image 1 of 2 Samsung Galaxy Watch4  Motherboard Replacement, Remove the motherboard: step 9, image 2 of 2
    • Use your fingers to lift the motherboard out from the watch assembly towards the bottom of the watch.

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Conclusion

If possible, turn on your device and test your repair before resealing.

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

Take your e-waste to an R2 or e-Stewards certified recycler.

Repair didn’t go as planned? Try some basic troubleshooting, or ask our Answers community for help.

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One other person completed this guide.

Adriana Zwink

Member since: 12/18/19

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