Poor 4k Picture when using internally loaded streaming apps

[isikor]

I have a TU7000 65" 4k TV.  I've had it for about 4 years and this is the first time I have ever had access to UHD 4k content.  I'm using YouTube TV loaded directly to the TV.  When I tune in to a 4k channel the picture is all washed out.  The colors are dull and overall look terrible.  Is this TV capable of displaying 4k images through internally loaded apps?  Has anyone else experienced this?  Is there a setting that needs to be changed?  Any insight will be greatly appreciated.

[LongHiker]

@isikor Are you paying the extra for 4K on YouTubeTV?  This is an additional $9.99/month in the US. 

[isikor]

Yes.  By the way, you can't see the 4k channels unless you are paying for them.  That was kind of a useless question.

[LongHiker]

@isikor There are channels which offer 4K if you pay, but still provide lower resolution if you don't.