crwdns2915892:0crwdne2915892:0
One of my buttons broke, so I needed to disassemble the watch. It's a quite easy process, and takes under 10 minutes. The process is very similar to this teardown, which is much better documented than this one.
crwdns2942213:0crwdne2942213:0
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Remove bands from the watch., they will be annoying later in the process.
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Heat the watch using a heat gun. I tried using iOpener, didn't work. Heat the watch along the yellow strip, that's where the watch is glued together.
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Wedge the iFixit Opening Tool between the display part and the rest of the body. The strip around the watch (yellow in my case) is on the screen part of the case, so try to put the tool underneath it. If you can't put the tool between, try pulling on the screen part like in the picture. That worked best for me.
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Reheat the watch whenever it feels cold.
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When the screen is relatively loose, use iFixit Opening Pick to remove it completely. Circle around the watch with the tool and it'll come loose. The watch doesn't need to be very hot in this step - the screen doesn't hold very well anymore.
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Be careful while removing the screen not to damage the flexible cable that connects the screen.
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Remove the screen cable, and the heart rate sensor.
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Unscrew 4 screws.
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I had a malfunctioning button. Actually it tore apart from the PCB. Mine was still working, but in case anyone needs to replace theirs, it's the Panasonic EVPAEBB2A. Other EVPAE models have different pressure force, but should work too. Except for EVPAE_E2A, those have different terminal shapes. You can check the datasheet
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