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What you need

  1. Garmin Forerunner 735XT Teardown, Garmin Forerunner 735XT Teardown: step 1, image 1 of 1
    • The strapless 735xt, the straps are secured by two T6 screws on each side.

  2. Garmin Forerunner 735XT Teardown, Prise off the front: step 2, image 1 of 2 Garmin Forerunner 735XT Teardown, Prise off the front: step 2, image 2 of 2
    • The front is glued

    • Use an iFixit Spuder to prise around the glue. It's not necessary to use a heat gun here.

  3. Garmin Forerunner 735XT Teardown, Carefully remove the screen: step 3, image 1 of 3 Garmin Forerunner 735XT Teardown, Carefully remove the screen: step 3, image 2 of 3 Garmin Forerunner 735XT Teardown, Carefully remove the screen: step 3, image 3 of 3
    • Once the screen moves, carefully remove the ribbon connector and the screen.

  4. Garmin Forerunner 735XT Teardown, Remove the main board: step 4, image 1 of 3 Garmin Forerunner 735XT Teardown, Remove the main board: step 4, image 2 of 3 Garmin Forerunner 735XT Teardown, Remove the main board: step 4, image 3 of 3
    • Two T6 screws hold the mainboard to the body.

    • The main board will move from where the Spuder is inserted.

    • Remove the green protective tape and disconnect the second ribbon cable before proceeding.

  5. Garmin Forerunner 735XT Teardown, Disassembled: step 5, image 1 of 3 Garmin Forerunner 735XT Teardown, Disassembled: step 5, image 2 of 3 Garmin Forerunner 735XT Teardown, Disassembled: step 5, image 3 of 3
    • The unit will now be disassembled

    • Unplug the battery by lifting up the connector from the bottom.

    • Further disassembly and analysis to follow...

  6. Garmin Forerunner 735XT Teardown, Closeup: step 6, image 1 of 3 Garmin Forerunner 735XT Teardown, Closeup: step 6, image 2 of 3 Garmin Forerunner 735XT Teardown, Closeup: step 6, image 3 of 3
    • GNSS receiver looks like MediaTek MT3333 with external amplifier+filter+chip antenna. And ARM7 CPU.

    • The watch has at least 3 Cortex-M4 microcontrollers, not counting Ant+ or GNSS chips! Microchip ATSAMG51, ATSAMG53 and MAX32360

    • nRF51422 contains ANT+ and Bluetooth LE functionality. And Cortex-M0 CPU to run these.

  7. Garmin Forerunner 735XT Teardown, Further closeup: step 7, image 1 of 2 Garmin Forerunner 735XT Teardown, Further closeup: step 7, image 2 of 2
    • Insert wisdom here.

Peter

Member since: 07/19/13

145 Reputation

1 Guide authored

11 Comments

I’ve not attempted to re-assemble yet. The glue was held around the LCD display.

These units are identical to the manufacturing process of more popular units such as the 235. So someone might of given a guide to putting those back together.

The core thing to keep in mind is that a decent seal is going to be required to avoid any water damage.

Peter - Reply

When you have a water damaged Forerunner 735, it is probably not necessary to take the 735 completely apart, to repair it. Just take away the front, and then use a air pressure spray to blow out the water. I did not test it, but here is an instruction, which shows that this worked for the Vivoactive HR:

https://www.youtube.com/watch?v=rAKbZ_Tx...

Peter Gamma

Peter Gamma - Reply

Correction: It was not air pressure spray but CRC electronic cleaner Dean Stucker used in his youtube video which shows how to repair a Vivoactive HR. Difficult to find here in Europe. Alternatives?

Peter Gamma - Reply

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