Got this little mid 90s Baby-G inverted display unit from another batch of broken Casio watches from Japan:
I did my usual triage, and stuck in new batteries, and nothing happened. So I had a little look inside and found some corrosion in the battery bay:
So, decided to give it a quick clean:
These were the culprits:
The case looks pretty clean inside, so did not seem to have gone too far:
Movement out:
Quick tear down:
The extent of the corrosion was not too bad:
But there was some buildup around the PCB:
Part way through cleaning:
Other side just needed a little clean up:
Most of the bits and pieces:
Back together....
Looks ok?? Well, it runs, and has a display and buttons working/etc... However all was not well. It was only viewable from a few specific angles and was pulsating slightly, so I had a suspicion the tiny ribbons that connect the screen to the pcb may have been either faulty or dirty.
This is what it looked like when viewing straight on:
So, I pulled it back to bits, and this time pulled the display fully into parts too, and gave them a proper clean with IPA and a bristle brush. Back together, and it looked promising!
Voila!
Backlight is working:
Back onto its original strap
