820-3437-B orange light but not turn on

Dewanbd

Member
It was drinks damaged.After connected power orange light buy not turn on.Sometimes it turn on and
few minuites later turn off again.
PPBUS_G3H = 8.58v
PPBUS_S5_HS_COMPUTING_ISNS = 8.5v
PPBUS_S5_HS_OTHER_ISNS = 8.5v
PPDCIN_G3H_ISOL = 16.6v
PPDCIN_G3H = 16.6v

PP3V42_G3H = 3.42v
PPVRTC_G3H = 3.32v

PP5V_S5 = 5v
PP3V3_S5 = 3.32v
PP3V3_S4 = 0 v???

PP5V_S4RS3 = 0v
PP5V_S0 = 0V
PPVCC_S0_CPU = 0v
Any help please.
 

2informaticos

Administrator
Staff member
Any pulse at the big coils?
Check if any PM_SLP_Sx_L signal pulses triggering SMC_ONOFF_L.
Did you try to start in SMC bypass mode?
Check for corrosion around U1950 and U6100.
 

Dewanbd

Member
SMC bypass mode start it for few seconds and stop fan spinning.
yes, Pulse at the big coils.
PM_SLP_S4_L signal pulses triggering SMC_ONOFF_L ,Yes pulse is ther for short period.
corrosion around U1950 and U6100.Yes.
 

Dewanbd

Member
i found the short at p2 of L7430 and no short at U7400, it looks like PP1V2_S3 is short , so dont know
how to figure out.
 
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