Hello everyone, I seem to be the millionth person who had a nonfunctioning scroll whell on my H10 due to water damage, and the 1st person with the curiousity/chutzpah to actually try to fix it.
What I did is:
Take it apart. Prying it open is a pain but I suggest prying it with a flat-head screwdriver.
Unscrew those 12 screws to get behind the motherboard.
Now you see the screen and the scrollwheel.
First take out the plastic piece surrounding the scroll wheel which clicks off from the side.
Then, starting from the upper portion away from the data cable, BEING VERY CAREFUL NOT TO PULL THE DATA CABLE, peel the entire black touchpad from the metal piece behind it, which functions only as structural support.
Now you will see the thin electronic piece which reads the pressure you put on it with your finger (dont know what it's called-- I'm no tech expert).
Starting once again from the top, start to separate the black touchpad you used to know and love from the thin clear electronic strip I was talking about. Say bye to that black piece, and reattach the thin clear data strip back onto the supporting metal which you will screw back on. This is your new, exposed, but working touchpad!!
Reassemble the iriver and snap it back together and your device should be working just fine. You can try putting something over it to protect it, but I am just going to be very careful and have it bare for now. I'm going to leave mine in the case all the time.
Cheers!