I've figured it out. I'll do a quick write up here, as this was not so quite obvious.
There was nothing in the log, like the most common thing with drive being in dirty state. Chkdsk did not reveal any disk errors. The drive just simply would not mount. The problem was with a folder created by LG tv that holds cache like thumbnails, video settings, progress etc. But simply removing this folder was not enough. I had to run chkdsk on it (which still did not found any errors on the drive). Only then the drive started to mount in LE. Weird, right?
So its definitely something with LE build, since I used to swap the drive between TV and PC with no problems before.