How can I troubleshoot a backlight problem (dim screen)?

How can I troubleshoot a backlight problem (dim screen)?

Several months ago, my G Watch unfortunately went for a little swim and got water damage. I was able to remove the back and let it air dry for a couple days, after which the device seemed to work fine. The only noticeable issues I've had is a bit shorter battery life (but still enough to make it through a day) and a pretty dim screen. It is this second problem that I would love to fix.