hello Peter,
unfortunately, I don't think anybody has schematics for apple watches. I don't think they exist in the zone, and neither do the new iPad models. In such cases, we use experience and knowledge in the field of electronics. You need a good meter and some general knowledge in measuring passive consumer electronics. Unfortunately, to measure something and be sure that the measurement is correct - the element must be desoldered. Good luck :-)
It’s popular last times with the YouTube generation to buy "donors" - blocked ones and transfer parts without knowing what is that - I wrote about it above. This is a solution, but as you can see - it's quite short-sighted.
desolder, measure and email me, I’ll tell you some.
* regards,