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https://askubuntu.com/q/1062628
Title:
High PCH chip temperature while idle on MSI laptop. What should I do?
ID:
/2018/08/05/High-PCH-chip-temperature-while-idle-on-MSI-laptop.-What-should-I-do_
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You can get the temperatures from the same place where sensors gets it without installing the package first. Use this one-liner:
$ paste <(cat /sys/class/thermal/thermal_zone*/type) <(cat /sys/class/thermal/thermal_zone*/temp) | column -s $'\t' -t
INT3400 Thermal 20000
SEN1 53000
SEN2 52000
SEN3 55000
SEN4 58000
B0D4 49000
pch_skylake 72500
x86_pkg_temp 50000
pch_skylake is the temperature sensor for the Platform Controller Hub. Here’s what Wikipedia says about it:
The PCH controls certain data paths and support functions used in
conjunction with Intel CPUs. These include clocking (the system
clock), Flexible Display Interface (FDI) and Direct Media Interface
(DMI), although FDI is only used when the chipset is required to
support a processor with integrated graphics. As such, I/O functions
are reassigned between this new central hub and the CPU compared to
the previous architecture: some northbridge functions, the memory
controller and PCI-e lanes, were integrated into the CPU while the PCH
took over the remaining functions in addition to the traditional roles
of the southbridge.
And because “a picture is worth a thousand words”, here is a schematic:
………… 
Image: By Anas hashmi - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=9817206</sub>