When I connect U2414H to PC via HDMI, graphic drivers default settings are limited range - colours and especially black are washed out, which is visible in comparison to correct setting full range. So definitely monitor is expecting full range and doesn't change this just from being connected by HDMI.
* You would enter the PC graphic driver control panel and change the Color output dynamic range to Full.
But I was wondering if there is something specific in HDTV broadcast from DVB-C.
* Unknown. We did not test in this scenario.