820-3115 Green Light no Power

[DannyRinc]

3115 board with no liquid damage, only thing that looks funny is a tad bit of corrosion on a BKLT capacitor (C9712)

Pulsing PPVRTC, pulsing 5v_s5 and 3v3_s5, no PP5v_s3 or 3v3_s3.
CPUVcore is at 0.

PM_SLP_S4_L pulses around 20 mV so I don't think it's turning on enough for the SMC to do much.

MoBo is power cycling right? Probably a short on PP3v3_S5? Is this a rabbit hole board with no clear end?

 

[DannyRinc]

Found a short on PP5v_s3, inject 5v see what happens?

 

[dukefawks]

You did check that without power and waited long enough for it to discharge? What is resistance to GND on 5V_S3?

 

[DannyRinc]

GND to 5V_S3 is .1 ohm
Yes, without power, checked again today without having powered on.

 

[dukefawks]

Inject voltage, the short is low enough that something should heat up. Start low and monitor current.