Poor external screen resolution with macbook pro retina

Hi guys, pretty frustrated but i hop you can help
i have a mid 2013 macbook pro retina 15inch. i've downgraded in screen size from my imac 24inch. i purchased a 32inch lg smart tv to use as an external monitor but the resolution is horrific. i thought i could get myself a lot of screen retail space but it only seems to run in 1080p and everything is far to large and blurry. i'm connecting using HDMI. i've tried different colour profiles, i have tried using this script in terminal that i found to turn on font smoothing for all monitors but it doesn't work
defaults -currentHost write -globalDomain AppleFontSmoothing -int 3
any one know what i can do? i'm truly gutted atm

Something that's running on your machine (or something that's connected to it) is preventing it from sleeping when you close its built-in display. It should sleep and stay asleep as soon as that display is closed, unless you are running it in clamshell mode:
http://support.apple.com/kb/HT3131
Does the computer sleep properly when you close its display if the external monitor is not connected to it? Does the monitor have a USB cable that connects to the computer, in addition to its video cable?

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