Logitech g703, g603, g403 scroll wheel fix in 5 minutes
The common scroll wheel problem with the g403, g603 and g703. It is very easy to fix it. It takes only 5 - 10 minutes.
The problem that fixes is the skipping problem on the sensor. It goes up instead of down or the other way.
I recommend to not remove the cable that connects two parts. It is really hard to connect it later.