Antminer S1 schematics are available.

https://github.com/AntMiner/AntGen1/tree/master/PCB

They are a very good guide to the other Miners in particular the S3 if you combine them with the ASIC Datasheets.

https://bitmaintech.com/support.htm?pid=00720141220132903742H2RLy6C40630


Rich