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Introducción

Even the best electronics die out over time, especially devices used in harsh conditions. This guide will show how to replace the motherboard of your Garmin Fenix 3 if the electronics are showing signs of failure. You will need a T6 Torx screwdriver, a T5 Torx screwdriver, and a spudger.

  1. Use a T6 screwdriver to remove the five 1.7 mm screws from the watch face. Use a T6 screwdriver to remove the five 1.7 mm screws from the watch face.
    • Use a T6 screwdriver to remove the five 1.7 mm screws from the watch face.

  2. Carefully lift the face off the watch base.
    • Carefully lift the face off the watch base.

    • Do not yank the face. A ribbon connector connects the face and the motherboard, and yanking could result in damage to the motherboard or ribbon.

  3. Use a spudger to lift up and free the screen ribbon cable's press-fit connector from the motherboard.
    • Use a spudger to lift up and free the screen ribbon cable's press-fit connector from the motherboard.

  4. Set the watch face aside.
    • Set the watch face aside.

  5. Locate the antenna, which is located on the motherboard.
    • Locate the antenna, which is located on the motherboard.

  6. Carefully remove the antenna, and set it aside.
    • Carefully remove the antenna, and set it aside.

  7. Locate the two silver 1.4 mm T5 screws, and carefully unscrew them. To avoid losing or dropping the screws once they are loose, use tweezers to extract them. To avoid losing or dropping the screws once they are loose, use tweezers to extract them.
    • Locate the two silver 1.4 mm T5 screws, and carefully unscrew them.

    • To avoid losing or dropping the screws once they are loose, use tweezers to extract them.

  8. Lift the watch and turn it over one hand. The motherboard should fall out easily. When reinserting your motherboard, slide it in instead of pressing it. The motherboard must go beneath a lip at the base of the watch body.
    • Lift the watch and turn it over one hand. The motherboard should fall out easily.

    • When reinserting your motherboard, slide it in instead of pressing it. The motherboard must go beneath a lip at the base of the watch body.

  9. Using the spudger, separate the motherboard from the battery, which are both held together with a mild adhesive.
    • Using the spudger, separate the motherboard from the battery, which are both held together with a mild adhesive.

  10. Motherboard without metal cover
    • Motherboard without metal cover

Conclusión

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

Una persona más ha completado esta guía.

Hello,

i’m looking for replacement of start/stop button micro switch. Do you know what is the switch number which i can look for?

Thank you

Jan Stefan - Contestar

How did you remove the metal cover from the moterboard (last picture)

slowrun - Contestar

Where can I find a replacement Motherboard ? None of my buttons are responding and I can’t even do a Factory reset.

All that works is switching off and back on.

arnaud.lhote - Contestar

I have exact same issue. I sent my watch to official repair service to Split (Croatia) and they said they aren’t able to fix it. I can see only main screen of the watch, buttons don’t respond at all. Would like to know how to fix the issue.

ilija.veselica -

In Italy it’s the same story… impossible to repair ( button START/STOP does not function ).

I’m searching on eBay for a USED low cost Fenix 3 for change motherboard…

At the moment is the unic solutions…

Matteo - Contestar

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