Use this guide to apply new adhesive on the Apple Watch Series 1 after opening it up or having the Force Touch Sensor replaced.
Use a plastic opening tool to scrape adhesive off the back of the screen.
You may be able to peel up the adhesive with tweezers.
Once you have all of the pieces of adhesive removed, you may want to use an alcohol soaked q-tip to clean any residue off the back of the screen.
Use tweezers to peel the outer ring off of one of the adhesive strip pads.
Be sure to get both the double-sided adhesive and the brown backing paper.
Be very careful not to fold, bend, or stretch the adhesive tape, as this will make it too thick to seal the screen without a ridge between the screen and the case.
Lay the backed adhesive tape down on the Force Touch sensor, around the edge of the case where the screen rests.
Start in a corner with the tape as close to the corner wall as possible.
Press on the brown backing paper with a plastic opening tool to secure the adhesive around the entire perimeter.
Use a plastic opening tool to reconnect the display data and digitizer cable connectors.
Be careful not to touch any of the contacts directly, as your finger oils may impede connectivity.
To reinstall the metal bracket, line up the single tab with the slot in the top of the lower half, and slide the bracket down.
Snap the upper bracket in place.
Line the battery connector up with its mate on the cable inside the watch body.
Use tweezers to press the two connectors together.
If your replacement battery came with pre-installed adhesive, peel off the protective tab now, exposing the adhesive.
Rotate the battery down into its slot, and press it into position.
Press the battery down against the S1 to re-adhere it in place.
Now is the best time to test powering on your watch—if it doesn't turn on, double check all three connectors and try again.
Use tweezers to peel off the adhesive backing strip.
Peel the backing strip up halfway, then snip it with scissors so you can peel the rest off without it snagging on the display.
Move the screen back to the right, folding the display data and digitizer cables neatly.
Center the screen over the case and press it down firmly onto the adhesive.
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