Regarding your possibly dead modules, bloke who makes a bunch of overhaul vids says persistence can pay off; don't give a watch up for dead after one try. Shorting the AC pad is the first thing to try, then you can try giving it a bit and reinstalling the battery. If that doesn't work, he reckons a bit of warmth has often done the trick, like leaving it in your pocket for a day and then having another go.
I know! My journey into Casio restoration began with that discovery, and with the older G Shocks learning about the tiny spring that makes a contact against the case, completing the speaker circuit.
Regarding your possibly dead modules, bloke who makes a bunch of overhaul vids says persistence can pay off; don't give a watch up for dead after one try. Shorting the AC pad is the first thing to try, then you can try giving it a bit and reinstalling the battery. If that doesn't work, he reckons a bit of warmth has often done the trick, like leaving it in your pocket for a day and then having another go.