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Einleitung

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

    Where can I buy one as replacement ?

    arnaud.lhote - Antwort

Abschluss

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

3 weitere Nutzer haben diese Anleitung absolviert.

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 - Antwort

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

slowrun - Antwort

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 - Antwort

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 - Antwort

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 - Antwort

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 - Antwort

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 - Antwort

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 - Antwort

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