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Garmin Fenix 3 Motherboard Replacement

Introduction

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.

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  1. Garmin Fenix 3 Motherboard Replacement, Display Assembly: étape 1, image 1 de 2 Garmin Fenix 3 Motherboard Replacement, Display Assembly: étape 1, image 2 de 2

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

    Modifier

  2. Garmin Fenix 3 Motherboard Replacement: étape 2, image 1 de 1

    • 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.

    Modifier

  3. Garmin Fenix 3 Motherboard Replacement: étape 3, image 1 de 1

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

    Modifier

  4. Garmin Fenix 3 Motherboard Replacement: étape 4, image 1 de 1

    • Set the watch face aside.

    Modifier

    Hi can i replace only lcd because my sapphire glass is ok

    Drazen Popadic - Réponse

  6. Garmin Fenix 3 Motherboard Replacement, GPS Antenna: étape 5, image 1 de 1

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

    Modifier

  7. Garmin Fenix 3 Motherboard Replacement: étape 6, image 1 de 1

    • Carefully remove the antenna, and set it aside.

    Modifier

  8. Garmin Fenix 3 Motherboard Replacement, Motherboard: étape 7, image 1 de 3 Garmin Fenix 3 Motherboard Replacement, Motherboard: étape 7, image 2 de 3 Garmin Fenix 3 Motherboard Replacement, Motherboard: étape 7, image 3 de 3

    • 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.

    Modifier

  9. Garmin Fenix 3 Motherboard Replacement: étape 8, image 1 de 2 Garmin Fenix 3 Motherboard Replacement: étape 8, image 2 de 2

    • 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.

    Modifier

  10. Garmin Fenix 3 Motherboard Replacement: étape 9, image 1 de 1

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

    Modifier

  11. Garmin Fenix 3 Motherboard Replacement: étape 10, image 1 de 1

    • Motherboard without metal cover

    Modifier

    Where can I buy one as replacement ?

    arnaud.lhote - Réponse

Conclusion

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

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Auteur

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Adam Estabrook

Membre depuis le 09/07/18

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Équipe

Appalachian State University, Team S1-G3, Menagarishvili Fall 2018 Membre de l'équipe Appalachian State University, Team S1-G3, Menagarishvili Fall 2018

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16 commentaires

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 - Réponse

that's my problem too and i can't find any solution.

Hamidmonti -

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

slowrun - Réponse

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 - Réponse

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 - Réponse

Matteo, this is not the only solution!I’ve bought on ebay the START/STOP button, i’ve just to solder it.

I’m , like you, living in italy. The button comes from Russia, you can find on ebay for about 10 euros shipped =)

Francesco P. -

My buttons are totally broken, seems restart of system works, but when it is on I cannot switch anything. It seems like broken electronics, not really buttons. Any ideas about how to proceed in low-cost mode? Thanks!

Jan Wasilewski - Réponse

did you ever find a solution to this issue as i am having the exact same problem

Gearoid Rogers -

I have a Garmin Fenix 3 HR and I have problems both with GPS (any signal more) and HR monitor (erratica data both with or without HRM Tri-band). Do you think that could be a motherboard problem? Where can I buy spare parts for my garmin?

Thanks

Guido Ianiro - Réponse

i’m not sure whether i need the motherboard or the display …. i do know that my watch will not power on and prior to that happening the display was hard to see

Eric Marable - Réponse

I am having the same issue too - hard reset will work via the light button but nothing else works after this, all I see is the main watch time face

Gearoid Rogers - Réponse

Hello,

My comment comes a bit late. Anyway, in case it could be helpful to someone:

My Fenix3 was not responding. After a loooong wake up and then analysis process, i found that the START/STOP switch was dead.

I ordered a mother board (+ i took the opportunity to change also the battery). It took almost 3 weeks to be delivered so I couldn't wait and i purchased a Fenix7X. But for 42US$, I could fix my Fenix3 that is now working as it used to work on its first day.

So, if you get your Fenix3 (or other model?) definitely stuck, don’t throw it away. Just change the motherboard and you’ll get a brand new healthy watch.

Laurent Bonet - Réponse

Hello Laurent, I want to know, where you get the motherboard?

alejovalencia -

Hai @laurent Bonet, can i know, where you get/buy the motherboard?

Mohd Azlan - Réponse

I have bought a new rear assembly. After removing the motherboard I have a small board with three pins and a spring. This is glued to the back assembly. Can this be removed and transferred to the new rear assembly?

Granterz - Réponse

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