I have a 4k TV that I often use as external monitor with my phone or old Macbook Pro. I recently got the new 13.3" MBP. Even though I can drive an external 4K monitor via HDMI, somehow it won't drive my TV via HDMI. Is this an issue with this MBP (the non-touchbar version), or am I just doing something wrong? It would be pathetic if this laptop couldn't drive the TV, since even my smartphone can...