Ergodox - left hand not working

[sitch]

Hi, my right hand is all good but left hand is completely non functional

I have checked the TRRS connection and diodes all is good, is there anything else should I be checking?

Could it be the teensy having problem? but I think that should affect the right side too if teensy the problem?

http://imgur.com/a/5l2Jv


Thank you