I have a MacBook Pro Retina early 2015 8 GB and Intel 6100 1536Mb.
Today I used an HDMI cable to my TCL 55" TV (TCL U55S6906 / Chassis NT667E-EU) and when running Mac OS X the text is blurry and only at 30Hz. While running Windows 10 it looks better but is still at 30 Hz.
Also, sometimes it goes black for a second or two, and sometimes it shows green lines and plays a strange sound.
My TV only has HDMI but I wonder if I could get 60 Hz with a Thunderbolt 2 cable to HDMI 2.0? Does anyone know why it shows those lines and makes those sounds (which remind me of interference).