PP3V3_S5 Missing on 820-3437


New member
hi guys,

im having some issue with this 820-3437 board,condition should be as below :

plug in charger,green light,

PPBUS_G3H fine at 8.56v
PP5V_S5 at pin 1 C7505 is fine at 5.02v

but PP3V3_S5 to wake the machine at pin 5 U8180 is missing.

what created the pp3v3_s5? i check at PP3V3_S5_REG_R also missing.


L7560 should have 3V on it then. If not then check for a short on this rail. If not shorted a bad U7501 is possible, also check for corroded traces around there.