Sony calibrate I have a sony xbr65x850b 4k tv and I'd like the best picture possible, what is the best calibration settings for this tv?

mostly its main board problem first check power supply and all voltages

You could check your TV manual or by a video calibration disk. Or you can read this article "How To Get The Best Picture On Your TV".
https://www.techadvisor.co.uk/how-to/software/how-to-calibrate-your-tv-to-get-the-best-picture-possible-3592300/

Hello!

I'm adding a manual to a similar LG TV.
Hope it will help!
https://manualsbrain.com/en/manuals/1481198/?page=15

Basic Troubleshooting for Amazon Fire TV Try these common solutions to resolve issues like a blank screen, app errors, and problems with your display or audio.
Can't Connect to Wi-Fi for common solutions that may help.
Amazon Fire TV is Frozen, Blank, or Won't Power On for solutions.
Change Your 1-Click Settings. Manage Your Apps & Games.Contacting Your TV Manufacturer .
About 4K Ultra HD on Amazon Fire TV (2nd or 3rd Generation)Check the Video Resolution section under Display to make sure your connected TV meets HDCP 2.2 system requirements for watching video in 4K Ultra HD. For more information, go to Watching Video in 4K Ultra HD on Fire TV.

Calibrate Your Display

If part of your display is missing or cut off at the edges of your screen, your TV may be automatically scaling your picture.
You can use the Calibrate Display tool (Settings > Display & Sounds > Display > Calibrate Display) to adjust for this.
When you open the tool, you'll see four grey arrows pointing to the edges of your screen, which you can use as a guide when making your adjustments. Press the Up and Down keys on your Fire TV remote until the grey arrows are completely visible and touching the edges of your screen.
Contacting Your TV Manufacturer .Follow the on-screen instructions to make adjustments with your TV remote. You should still see the grey arrows from the Calibrate Display tool--make sure the tips of the arrows are completely visible and touching the edges of your screen.
Amazon Video Settings and Devices on the Amazon website.
Go to the Parental Controls section and enter a new 5-digit PIN under Amazon Video PIN. Then select Reset Your PIN.
MicroSD Storage for Amazon Fire TV (2nd Generation) .
USB Storage for Amazon Fire TV (1st Generation).If your storage device is compatible, try safely removing and then re-attaching it to your Amazon Fire TV:

1. Select Settings > Device from the Fire TV menu, and then select your storage device.
2. Select Eject.
3. Wait for the on-screen confirmation before safely removing the device.
4. Re-attach your storage device.

It cannot be calibrated.

Without some serious calibration equipment... this is a bit of a red herring, and is just down to what YOU feel looks best. Your first consideration in calibration, is your own eyesight. Have you had your colour receptiveness tested? I doubt it, and on that basis calibration is pretty pointless, and also subjective.

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Brightness to 40 > 50%, Contrast to 65 > 75% & Color to 30 > 35% must give a good picture. First, try to adjust a good B/W picture, by adjusting the brightness and contrast. After you have got a good picture in B/W, then advance the color intensity, according your viewing taste. Gopakumar Gopalan Google

The best way to set up a TV such as yours without a calibration device is to get a high definition picture of someone's face on the screen and adjust the color, brightness and contrast until the face looks as life like as possible.

How do I Calibrate a Sony KDL-32m3000 LCD TV? By Oliver Hill, eHow Contributor updated: October 2, 2010 Calibrating your Sony HDTV will give you the best settings available for your TV. Fotolia.com">tv control and tv 16 image by chrisharvey from Fotolia.com

People often calibrate their TVs to give themselves and their family the best possible viewing pleasure. Using the optimal settings on your Sony HDTV will give you an overall picture and sound quality that is the very best that your TV can offer. If you are yet to effectively calibrate your Sony TV you could be only getting a small amount of what your TV can offer you.
Difficulty: Moderately Easy Instructions Things You