820-3115 green light no power

Gmorb

Member
board wont turn on and had very noticeable water damage. replaced whatever was badly damaged and retraced some areas. i get a green light on charger.

pp3v3_s4=.600v

something is pulling s4 down correct?

tried comparing the board with a known good but could not find any obvious differences besides pp3v3_s4 being low.

what should i look for?
 

Gmorb

Member
ppbus is present
3v3_s5 is present
5v_s5 is present
c1802 is 3.0v
c1803 is 3.042v

i removed smc and area looks clean
 

Gmorb

Member
i just replaced a bunch of components in that area including clock chip because it was water damaged. now i get 3.3v on c1802/03
as far as power cycling no
pp3v3_s4 still .600v and drops.
 

dukefawks

Administrator
Could be so many things now. Was there corrosion around the PCH? Checked all rails for shorts? What SMC did you put back on?
 
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