The Apple Watch Series 4 has a glass screen. And glass.. you know... can break. Especially when you're doin' active people things like closing your circles. HUGE thanks to my buddies over at https://www.fixdphones.com/ for helping with this Glass only Apple watch repair. Check them out if your watch is broken, (cuz I'm definitely not going to do it again.) He has other videos on the series 3 Apple watch: https://youtu.be/ucVQGA-KSD8 since each Apple Watch version is a bit different.
His channel: https://www.youtube.com/channel/UCoBTIuhduIoXk3x81trUnzQ
Attempting a glass only Apple Watch repair is probably the hardest 'cell phone' repair there is. And I *highly* recommended not doing it. The most difficult parts of replacing the screen on an apple watch is making sure not to damage the... well... everything. The force touch ring between the glass and the metal body, then the touch sensitive layer right under the glass, and the display right under the touch sensitive layer... The Apple Smart Watch is a fragile sandwich of complexity. Good luck.
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JerryRigEverything assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. JerryRigEverything recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, expensive electronics, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of JerryRigEverything, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not JerryRigEverything. Only attempt your own repairs if you can accept personal responsibility for the results, whether they are good or bad.