820-3437 Green light, no fan spin

Sr. Robot

Hi, got an 820-3437, no visible signs of water damage.

Ive got green light but not fan spin.

PP3V42_G3H = 3.4v

PPBUS_G3H = 8.5v

PP5V_S5 = 5.0v

PP5V_S0 = 0v

PP3V3_S5 = 3.3v

PP3V3_S4 = 0v

PP3V3_SUS = 3.3v

PP3V3_S3 = 0v

PP1V8_S3 = 0v

Sr. Robot

Replaced it, no change, is it possible its something else? Ive got not more 820-3437´s for the time being to get another SCM Chip


Staff member
So PM_PWRBTN_L has always 3V?
Even at the moment you trigger SMC_ONOFF_L?
In such case, check all SMC (2 OF 2) voltages and signals, at page 37.
If o-scope available, check for 12MHz at Y5110.