QSC TouchMix 16 sound problem fixed (other touchmix versions may also get this)

Nick Francis

New member
Mar 12, 2023
Forest City, Iowa
Hi, I have a TM16 that is SN: LLE0G1192, which I believe indicates it was manufactured in Dec 2014. I bought it used about a year ago and soon discovered Aux 3 had little to no output, so I simply didn't use that output when gigging. I finally decided to tackle the Aux 3 issue and discovered this thread. I'm glad I did!! The info here has been invaluable to me. I opened my TM16 up and found not only a bad cap (bulging) on Aux 3's output, but bulging caps on both the left and right Mains (all 4 caps). The Mains have been working ok as far as I know but I'm pretty sure it was just a matter of time before I would have had a failure and most likely at a gig! Anyway, I have new caps on order, and I've removed all the output caps for the Mains and Auxes 1 thru 6, while I wait for the new caps to come in. I have pics to post of the bad caps and PCB where they were removed from, plus pics of the display ribbon cables and Master Controller connector J1401. Disconnecting J1401 was not easy as it's been connected for 9+ years. I'm thinking that the plastic on the connector and surface mounted socket it goes into have been baked by the above average heat that the TM16 generates and they more or less fused together. I worked them apart little by little using two jeweler's screwdrivers (one on each side of the connector) and luckily nothing broke. Pulling on the wires like I saw in a You Tube video was not an option to me because the wires would not take the strain of the pulling given how tightly fused together the connector and socket had become. Anyway, that's it for now. Once I get the new caps installed, the unit put back together, fired up and checked out, I will return to post the outcome of my repair endeavor.


  • Bad Caps.JPG
    Bad Caps.JPG
    2.7 MB · Views: 7
  • MainRight.JPG
    2.2 MB · Views: 6
  • MainLeft.JPG
    2.5 MB · Views: 6
  • Aux3.JPG
    2.6 MB · Views: 6
  • MasterControlConnector J1401.JPG
    MasterControlConnector J1401.JPG
    2.6 MB · Views: 7
  • DisplayRibbon.JPG
    2.5 MB · Views: 7

Paul Lewendon

Oct 8, 2019
British Columbia Canada