
Can you remove the module from the case and photo upload the front and back of the module?
The display looks good still (no leaks, etc...) Did you try fresh brand new battery?
Did you check the clock crystal, maybe that went? Also is there a test point on the module to check the clock?
Did you try the hair dryer trick - heating the whole watch - maybe it has a bad solder joint on it.
Does the display light at all?