Hi All, today I decided to convert my Casio's display from negative to positive. I really liked the look of the negative display but after some use with the watch, I couldn't really stand how hard it was to read the display. For those that own this watch (or similar) and want to do the same, below is my process of converting it to make it much easier to read. Enjoy!
Here you can see the watch's negative display. Even under a bright desk lamp, it's hard to read unless angled correctly.
First step is to remove the screws that hide the main watch back screws we need access to.
You may have to use 2 screwdrivers, one to hold one side while you unscrew the other side. This part was a little tricky for me since the screwdrivers kept slipping.
There is a metal tube that also need to be removed along with the 2 ends of the screws. I just pushed it out with a screwdriver.
Now with the straps removed, unscrew the 4 screws holding the watch back. The plate is under spring tension so I pushed down on the plate while unscrewing the 4 screws.
Plate removed. Be careful not to damage or rip the O-ring.
Prior to removing the gray rubber piece, you'll need to bend the little metal tabs up.
Now the battery and movement is exposed.
There is a small white tab holding the sensor wire down. Lift the tab up and CAREFULLY pull the sensor cable out of the movement.
Watch movement is out. Now that it's exposed to more light, the negative display actually doesn't look too bad.
Removing the polarizing film was pretty difficult. It is stuck on with pretty strong adhesive and while trying to slide the tweezers under to pull it out, I accidentally broke off a piece and scratched the film.
Polarizing film turned 90 degrees. It's now much more legible.
Because I damaged the original polarizing film, I used some new film from a pair of 3D glasses. Be sure to clean off any sticky adhesive with something like Goo Gone.
I cut the new film and stuck it inside the case, then placed the movement back in to check and make sure everything looks good. Be sure to cut the shape of the new film with the positive display showing and not the negative side.
Be sure to clean the polarizing film and watch movement screen so that there's no dust inside. Also don't forget to reconnect the sensor cable. Everything looks good so proceed to assemble the watch back in reverse order.
ALL DONE! Overall took a little more than an hour to complete. Now it's much easier to read and looks great!
Comments welcome and let me know if you have any questions :)