Unfortunately the problem with your TV is the filter on the backlight LEDs. LG also has this problem where the filters burn off and leave a bluish LED. The only solution is to replace all the LEDs (or have replaced).
SOURCE: problem with a colour display on Hisense tv
If your picures are all purple it means that the green colour is missing. TV colour is made up by mixing Red, Green & Blue. Removing Green leaving Red & Blue makes purple. Study the green colour circuit for a fault and confirm that the green gun inside the tube is working.
SOURCE: bluish green colour vertical line is coming in my
Your laptop screen has been faulty. you can checked it from service center.
SOURCE: New Hisense 55 inch LED TV does not have volume
Check its speaker. If it found OK, check and replace the audio output circuit board.
If you wish to get more details; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. Common set-up codes to check with TVs and other devices are given, in the order of the "device's brand name list" in alphabetical order. Pull up older posts.
http://electro-medical.blogspot.com/
SOURCE: How do i turn on smart tv mode with 1080p on hisense 55 inch without a remote
I think you will need a remote as i looked up the manual and every setting can only be changed by remote :( Maybe get a universal remote??
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