To detect all sensors on your motherboard with lm-sensors do this steps:

(Tried on Gigabyte x370, but also works on B250/Z370/B450M and on ASUS motherboards | arch wiki)

(information from arch wiki and there)

1. sudo vim /etc/default/grub or open it with your editor
2. find this line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and add to it this acpi_enforce_resources=lax it will looks like this now GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_enforce_resources=lax"
3. save and exit your editor, then run sudo update-grub
4. reboot your pc
5. now run git clone https://github.com/h4x0rlol/archlinux-ryzen-setup.git
6. cd archlinux-ryzen-setup
7. run ./setup.sh (press enter and type yes when it asks)
8. now run sudo modprobe it87 force_id=0x8686 or sudo modprobe it87 force_id=0x8628 (8628)
9. now run sudo sensors-detect and press enter everytime
10. sensors and zenmonitor now should show actual temps and voltage

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To fix noisy cpu fan and random type freezes:

1. Turn off Core Performance Boost in BIOS