Forerunner 620 Battery and/or Screen Replacement

Written By: phico
  • Comments: 14
Forerunner 620 Battery and/or Screen Replacement

Difficulty

Moderate

Steps

5

Time Required

30 minutes - 1 hour

Introduction

Use this guide to repair and replace the battery and, by extension, the screen, in a Garmin Forerunner 620. The battery is soldered in, and the screen needs to be completely removed before you can access it. Nonetheless, if you're having battery issues, this is the guide for you.

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    • Carefully remove the display of the watch by thoroughly heating the display and gently prying with the help of a suction cup.

    It is extremely difficult to remove the glass/LCD without breaking the glass.

    John Lasseter -

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    • Remove the screws which secure the main board in place.

    Not mentioned in the tools list, but you need a T5 driver for this part.

    John Lasseter -

    At this point, with the motherboard out, it's a good idea to clean off the residual adhesive tape that was holding in the display glass. Any adhesive that is left behind poses a risk of compromising the water seal and/or causing the display to not seat properly. Scrape off the residue, and clean the rim with isopropyl alcohol.

    John Lasseter -

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    • If the connector for the battery breaks, you can solder the connections directly to the motherboard.

    • If the connector is still intact, you can simply clip the new one into place.

    What's the dimension of the original battery?

    Bac0n -

    The battery is glued onto the motherboard. Fortunately, the adhesive isn't terribly strong, so you can get the battery out without a solvent.

    STEP 1: Disconnect the battery from the motherboard!
    STEP 2: Use the wide end of a plastic spudger and gently pry underneath around the edges of the battery. Hang on to the tiny piece of green tape, which appears to be a minimal form of shielding.
    STEP 3: Install the new battery. There's a good chance you'll have enough adhesive tape left from the old battery that you can just stick the new one on top. Put the small piece of tape back.

    John Lasseter -

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    • If the LCD is broken, you can replace it by removing the two flat cables which connect it to the main board.

    • The touch screen cable has a lock with a small white lever which should be lifted gently to remove the cable.

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    • You can now glue the display back in place using B-7000 adhesive.

Conclusion

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

Author

phico

Member since: 22/03/21

295 Reputation

9 comments

Where did you find the replacement battery?

Clarence Chung -

I bought this model on Amazon : "

CELLONIC® Smartwatch Replacement Battery PD3032, 361-00047-0 Compatible with Garmin Approach S1, Forerunner 110, Forerunner 210, Forerunner 610, Forerunner S1 Replacement Battery 200 mAh Battery Fitness Tracker

"

Philippe Collignon -

Do you have the dimensions of the original battery?

Clarence Chung -

Is B7000 adhesive necessary?... or will E6000 also work the same?
Thanks in advance.

jjc -

Changed the battery, all good, except that the touch screen is no longer responding to my touch. :<

Clarence Chung -

@jjc I used B7000, it has some elasticity and is usually recommended for smartphone screens.

@clarence chung, maybe you did not fix correctly the ribbon cables

Philippe Collignon -

Replaced the battery okay but can't seem to connect up the touch screen cable. Didn't see a white lever when I disconnected it and I cannot see how the cable is fixed down onto the board. Any help would be most appreciated!

Steve Charleston -

I am replacing the battery in my 620. I seperated the plastic top screen from the lower touch screen, they are joined by UV glue. The photos in this tear down show these as being seperated prior to reassembly. Per the photos there is a contact point between the 2 parts at the bottom of the screen, the guide does not mention the 2 parts being rejoined. Currently GPS cannot get a lock so I wonder if the top plastic screen is the GPS antenna but cannot find anything online on where the antenna is. Any idea on this. Thanks

Paul -

Hi Dear,

my Forerunner 620 does not charge anymore. USB dock seems good because between pin 1 and 4 I get 5V.

On the watch pin 1 and 4 are short circuit... please could you confirm that pin 1 and 4 in the watch should not to be short circuit?

Thanks

Giovanni -