Hello,
1. Feedback -> The person who designed the TV should be given the feedback that the power cable prevents the users from easily installing TV on a slim wall bracket. Why would you start thinning the TV but have a power cable which is as thick as my old PC is beyond me. It sticks so much out that we are expected to create a custom hole on the wall to accommodate it sticking out.
2. Problem - High pitch noise
Chat Reference -> 2128173458,
Order Ref: ->UK5605996831,
Model -> QE65Q800TATXXU,
Software Version -> T-NKMDEUC-1403.1 , B6052200/B60202, BT - S
A really annoying high pitch noise starts ONLY when I use a smart TV app. Because of this, I had a engineer visit, replaced the original tv with another one and still it happens. It is not coming from speakers as when you mute the speakers you still hear the high pitch noise. Husband tried to troubleshoot this by disconnecting Network cable and other cables and problem still persists. Connecting via Wireless. The reason I bought the TV was because the apps video is upscaled which in turn gives us vibrant video, however the high pitch noise from the board is creating a negative experience. Last I chatted with one of Samsung reps was that they will be escalating the issue -(Thursday 12th) and I have not heard anything since.
I wanted to put this in the community to ask people who have bought an 8K TV and getting high pitch noise when using Apps directly.
PS: This noise disappears when I access any external equipment via input connections like HDMI. so it seems like processing board somewhere!
how about that! Im returning the tv where i bought it and i will not own any samsung products ever again. 
din tv ska tjuta högt... i alla fall, men jag stod på mej och skickade in den på service. Nu är den tillbaka och den är tyst och fungerar som den ska. Enligt verkstan va det inget fel på tv:n haha, men ändå bytte dom en "svagt tjutande nät/led i förebyggande syfte".... 
