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Mouse repair Logitech G303 Daedalus Apex Rate Topic: -----

#1 User is offline   aotsukisho 

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Posted 17 December 2018 - 10:53 AM

I had a mouse that was having problems, and was outside of warranty. Logitech support was helpful, but ultimately they no longer produce the mouse and as such cannot give adequate service for it. I decided to take things into my own hands, since the warranty was over anyway.

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Here are the switches, Omron D2FC-F-7N which are the same as the ones Logitech uses

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This is the mouse in question, a G303 Daedalus Apex. It developed multi-clicking per press on the left click which means the switch has gone bad.

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I used a screwdriver to lift up the mouse foot on the top

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Same thing with the foot on the bottom. Logitech has molded in a small indent where you can insert a prying device making it easier to do so

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Here is the mouse with the top and bottom feet. The ones in the center you can leave alone

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Opening up the mouse. I am also able to clean the gunk buildup near the case seam that I couldn't reach normally.

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Here is the G303's main PCB removed from the chassis.

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Looking underneath. Apparently some G303's have had issues with the sensor lens rattling around, but not on mine.

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I desoldered the old switch, here it is next to the replacement for comparison. The part numbers and what I'm assuming to be batch numbers are completely different. I think 'Omron' is molded into the switch body somewhere, so I am not too concerned about authenticity at this point

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New switch soldered in. Visible difference between RoHS (right) and leaded (left) solder

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Mouse reassembled and the feet ready to be put back on after some testing. It did in fact work properly in testing, so this procedure was a success.

From what people are saying online, this unintentional multi-clicking is a problem no matter what brand mouse you go with, as it is an issue of microswitches wearing out and all mice use similar form factor switches. Logitech mice seem to use the same microswitch however, so ordering replacements is easy. Now that I have the switches in, I should go and find my old MX510 from 2006 that I stopped using for this exact reason and see if it uses the same switches.
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