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What you need

This teardown is not a repair guide. To repair your Garmin Forerunner 245 Music, use our service manual.

  1. Garmin Forerunner 245 Music Teardown, (Optional) Remove bands: step 1, image 1 of 3 Garmin Forerunner 245 Music Teardown, (Optional) Remove bands: step 1, image 2 of 3 Garmin Forerunner 245 Music Teardown, (Optional) Remove bands: step 1, image 3 of 3
    • This watch makes use of 20mm quick release bands.

    • Slide the pin on the metal bar and pull the band away from the watch body.

  2. Garmin Forerunner 245 Music Teardown, Explanation of glue obstacle: step 2, image 1 of 2 Garmin Forerunner 245 Music Teardown, Explanation of glue obstacle: step 2, image 2 of 2
    • (First photo) Past Forerunner models made use of a simplified glue construction which made it easier to heat-soften the glue and remove the screen by prying or by suction.

    • (Second photo) This watch (and other recent models) makes use of a complicated glue construction which makes it more difficult to heat-soften the glue and remove the screen by prying or by suction.

    • For more detail, the 3D models used to produce these images are available at these links: (old, new) and can be opened in your browser at https://openjscad.azurewebsites.net/.

    • Watch body

    • Glue

    • Bezel

    • Screen

  3. Garmin Forerunner 245 Music Teardown, Attempt 1: Remove the combined screen and bezel via suction: step 3, image 1 of 2 Garmin Forerunner 245 Music Teardown, Attempt 1: Remove the combined screen and bezel via suction: step 3, image 2 of 2
    Tool used on this step:
    iOpener
    $12.99
    Buy
    • This method is likely to fail. If you cannot complete it successfully, move on to the (more destructive) next step.

    • Utilize your choice of iOpener, heat gun, hair dryer, oven, etc. to soften the internal glue.

    • Attach a suction cup to the watch face and pull up while holding the watch body in place until the two separate.

    • Be careful not to damage the FFC (flexible flat cable) connecting to the screen after separation.

  4. Garmin Forerunner 245 Music Teardown, Attempt 2: Remove the combined screen and bezel via prying: step 4, image 1 of 3 Garmin Forerunner 245 Music Teardown, Attempt 2: Remove the combined screen and bezel via prying: step 4, image 2 of 3 Garmin Forerunner 245 Music Teardown, Attempt 2: Remove the combined screen and bezel via prying: step 4, image 3 of 3
    Tool used on this step:
    iOpener
    $12.99
    Buy
    • This method is likely to fail. If you cannot complete it successfully, move on to the (more destructive) next step.

    • Utilize your choice of iOpener, heat gun, hair dryer, oven, etc. to soften the internal glue.

    • Wedge your tool of choice (spudger, opening tool, knife, etc.) between the bezel brim and the rest of the watch body until you reach the wall of the plastic ring which hangs down from the bezel. Pry the watch face away from the watch body until the glue releases.

    • Be careful not to damage the FFC (flexible flat cable) connecting to the screen after separation.

    • You may need to cut some material away from the watch body or bezel brim in order to slide your tool in far enough to pry.

  5. Garmin Forerunner 245 Music Teardown, Attempt 3: Remove the combined screen and bezel via cutting: step 5, image 1 of 3 Garmin Forerunner 245 Music Teardown, Attempt 3: Remove the combined screen and bezel via cutting: step 5, image 2 of 3 Garmin Forerunner 245 Music Teardown, Attempt 3: Remove the combined screen and bezel via cutting: step 5, image 3 of 3
    • While this method is more likely to work, it is also more likely to damage the screen.

    • Slip a knife between the bezel brim and the rest of the watch body. When you reach the wall of the plastic ring which hangs down from the bezel, don't stop. Instead, saw your way through this wall and make a slot large enough for a pry tool.

    • The FFC for the screen is particularly vulnerable if you choose to make a slot near the 6 o'clock position (under the "GARMIN" logo) due to its attachment point to the screen just behind the bezel ring.

    • Place your prying tool as far as it will go into the new slot and push the screen up until the glue releases.

  6. Garmin Forerunner 245 Music Teardown, Disconnect the screen and heart rate sensor: step 6, image 1 of 3 Garmin Forerunner 245 Music Teardown, Disconnect the screen and heart rate sensor: step 6, image 2 of 3 Garmin Forerunner 245 Music Teardown, Disconnect the screen and heart rate sensor: step 6, image 3 of 3
    • Disconnect the screen FFC from the motherboard as described in this guide.

    • Similarly undo the connector for the FFC leading under the motherboard to the heartbeat sensor and vibration motor.

  7. Garmin Forerunner 245 Music Teardown, Screen closeups: step 7, image 1 of 3 Garmin Forerunner 245 Music Teardown, Screen closeups: step 7, image 2 of 3 Garmin Forerunner 245 Music Teardown, Screen closeups: step 7, image 3 of 3
    • Insert wisdom here.

  8. Garmin Forerunner 245 Music Teardown, Remove the motherboard: step 8, image 1 of 3 Garmin Forerunner 245 Music Teardown, Remove the motherboard: step 8, image 2 of 3 Garmin Forerunner 245 Music Teardown, Remove the motherboard: step 8, image 3 of 3
    • Undo and remove both of the T5 screws.

    • Turn the watch over so it is face down and let the motherboard fall out of the watch body.

  9. Garmin Forerunner 245 Music Teardown, Parts identification (watch body): step 9, image 1 of 2 Garmin Forerunner 245 Music Teardown, Parts identification (watch body): step 9, image 2 of 2
    • Heart rate sensor

    • Vibration motor

    • Charging/USB contacts

    • Antennas

    • Waterproof button chambers

  10. Garmin Forerunner 245 Music Teardown, Component identification (outside of shielding): step 10, image 1 of 1
    • ANT/BLE/BT coprocessor: Cypress CYW20719 datasheet

    • GPS coprocessor: Sony D5603 datasheet

    • RF front end: Qorvo (RF Micro Devices) RFFM6205 datasheet

  11. Garmin Forerunner 245 Music Teardown, Remove shielding: step 11, image 1 of 3 Garmin Forerunner 245 Music Teardown, Remove shielding: step 11, image 2 of 3 Garmin Forerunner 245 Music Teardown, Remove shielding: step 11, image 3 of 3
    • The sides of the metal shielding are clips which fit around the small metal walls underneath of them on the PCB. You can reach under the end of the clips and push up to remove them.

    • Alternatively, stick something small past the gap between clips and under the shielding, then use it to pull the shielding up.

    • Remove the 3M tape covering the rest of the components.

  12. Garmin Forerunner 245 Music Teardown, Component identification (inside of shielding): step 12, image 1 of 2 Garmin Forerunner 245 Music Teardown, Component identification (inside of shielding): step 12, image 2 of 2
  13. Garmin Forerunner 245 Music Teardown, Remaining components to be identified: step 13, image 1 of 1
    • 905 AGR (qr code)

    • LNF 852

    • K6A

    • J80 (circle) JD910

    • Unknown

    • Many other chips on both sides of the motherboard are too small to be legible by me, but might make sense to others.

    • The chips starting with 908 are likely designed by Garmin and proprietary.

    • Other chips with single and double letter names may be named according to this reference.

  14. Garmin Forerunner 245 Music Teardown, Further closeups: step 14, image 1 of 3 Garmin Forerunner 245 Music Teardown, Further closeups: step 14, image 2 of 3 Garmin Forerunner 245 Music Teardown, Further closeups: step 14, image 3 of 3
    • Insert wisdom here.

  15. Garmin Forerunner 245 Music Teardown, Battery: step 15, image 1 of 1
    • Battery: Garmin 361-00086-11, 3.8Vcd * 180mAh = 0.68Wh, soldered to motherboard

    • Assuming you didn't destroy the watch too much during the teardown, putting it back together should be as simple as following the steps in reverse plus replacing the old glue with some new glue (B-7000 seems to be the most common recommendation online).

Kyle Westhaus

Member since: 05/15/20

786 Reputation

3 Guides authored

4 Comments

Great tutorial. I had a cracked screen for the Forerunner 245. I could remove the screen with a hairdryer and en stanley knife. I did not have to cut through the plastic. Just used the stanley knive because it's strong and real thin.

Repeat the heatproces often and take your time. As described in this tutorial, make sure to start at the two button side because because of the cable underneath.

Thank you again for this tutorial. It really helped me!

Djduck - Reply

you are the number one, thanks

David Asiain - Reply

This is a great tutorial. I´ll give it a try.

Do you know if it is possible to change the battery? My watch charges but then the battery drops real quick. In the store they told me that may be the battery died because I was charging it to the wall like a cellphone.

Thanks ;)

Carolina Alvarez - Reply

I have not attempted to replace the battery, but assuming you have a soldering iron, it should absolutely be feasible. Garmin doesn't appear to sell replacements for this exact battery, but I do see replacement options on both ebay and amazon when searching "garmin 361-00086-11". Of course, be careful with cheap batteries - probably your safest bet is to harvest one from another Forerunner 245M that broke before it put too much wear on the battery (e.g. from a broken screen).

In a general sense, any li-ion that is small enough to fit in the case and has wires to solder to the motherboard should produce the correct voltage, but you would have to check if the charging circuitry is in the battery cell or all on the motherboard - these are typically sold online as "protected" vs "unprotected" li-ion cells.

Hope that helps!

Kyle Westhaus -

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