Repair knowledge for -55c CPU temperature on AMD Ryzen CPUs in bios, the AMD Sideband temperature sensor interface (SB-TSI)
Recently I came across an x570 Aorus Elite where the temperature in bios was reporting -55c, i had checked the CPU_TEMP line connected to the IT8688
In my particular case, the SIC line going to the X570 chipset (PM_SIC) was shorted to ground, so far disconnecting the 0 ohm resistors connecting APU_SID and APU_SIC to the chipset has fixed my -55c issue, it seems like -55c is the fallback reading for CPU_TEMP which is just pulled up to VREF on most gigabyte motherboards
I wanted to post this as even the ever-reliable vlab forum was stumped on this issue
tags:
negative 55 degrees cpu temp
broken cpu temp reading bios
In my particular case, the SIC line going to the X570 chipset (PM_SIC) was shorted to ground, so far disconnecting the 0 ohm resistors connecting APU_SID and APU_SIC to the chipset has fixed my -55c issue, it seems like -55c is the fallback reading for CPU_TEMP which is just pulled up to VREF on most gigabyte motherboards
I wanted to post this as even the ever-reliable vlab forum was stumped on this issue
tags:
negative 55 degrees cpu temp
broken cpu temp reading bios