Not sure if it will help, but:
https://www.hpcfactor.com/support/cesd/h/0046.asp (For Jornada 710, 720 and 728
)
https://www.hpcfactor.com/forums/forums/thread-view.asp?tid=20114 (about Jornada 820
)
http://qdanotherside.web.fc2.com/docomo/index.html (Japanese site explaining how to repair Sigmarion 1
)
You might be able to learn some tips, there are many photos explaining it.
-stingraze
Edited by stingraze 2021-12-17 2:40 PM