820-4924 shuts down

[Sr. Robot]

820-4924 that shuts down after 30secs -2min. No kernel panic error.

In safe mode, SMC bypass it takes way longer to shut down.

I tried another motherboard on its chasis and it didnt shut down, so external components are ruled out

Voltages after shutdown =

PPBUS_G3H = 12.21v
PP3V42_G3H = 3.4v
PP5V_S5 = 0v
PP3V3_S5 = 0v

 

[2informaticos]

Check SMC_RESET_L and SMC_PM_G2_EN, when problem appears.

Any history available?