When soft bricked I would power off the phone by holding power till it went off then on for a second then right back off again. Make sure all drivers are installed before you plug in your phone. Once off hold vol up and plug into PC. This puts you into download mode. Now open the lg PC suite that your phone installs normally. Make sure you have internet connection. And at the top of the PC suite you will see a toolbar. Click " mobile devices " then in the drop down click " Restore upgrade errors". Let it do its thing. After its finished you'll also have the .kdz for KitKat in the PC suites files on your PC. I've fixed a dozen or so soft bricks using this method. And when I don't have internet connection I have used the "lg flash tool 2014 " along with the .kdz from the PC suite files and returned from soft brick.
Lg flash tool 2014 is posted in another thread on XDA. I am writing this in a hurry in hopes to help others but I'm rushing to work so don't have time to post links to the tools.