I just assembled mine but the left hand isn't working at all.
The right hand works perfectly. I'm looking for some help.
Some things I've tried/noticed:
1. Plugging in and out the 3.5mm cable from the right hand side cause the LEDs to go on and off. They all go on when the keyboard is momentarily not working and then off when it's working (kind of like it has to be redetected by Windows when you do this). This leads me to believe the 3.5mm jack on the right hand side is fine.
2. Plugging in the 3.5mm cable to the left hand side while the 3.5mm and USB cable from the right hand side is plugged in causes Windows to play the device connected sound.
3. Using a multimeter gives me positive results when touching matching solder points on the two 3.5mm jacks.
I'm guessing that it must be the I/O expander. The only other things I can imagine would be the two shorts you have to create near the 3.5mm jack on the left side or the 3.5mm jack on the left side itself, but since I can get signal when touching matching solder points on the two 3.5mm jacks it shouldn't be either of those, right? I'm not really sure exactly what to test with a multimeter in all honesty, I merely borrowed one from my brother to poke around somewhat aimlessly and could use some tips on what to check for.
I also don't have a solder suck, only some copper braid which is apparently like the crappy way to attempt to remove solder. I haven't had any luck trying to desolder the I/O expander so I can try resoldering it. Any tips on how to desolder without a solder suck and with only copper braid available?