3476 pp5v_S5 pulsing 5-3-5-3-5 etc

[Rford]

820-3476 Presented with no liquid damage, however r5193 an r5699 were blown, and pad on r5193 pp3v42 was gone. Ran a jumper to it. still no fan spin. Started through the rails. pp5v_s5 seems to be pulsing betwixt 5 and 3 volts... not normal is it?

 

[dukefawks]

Those resistors don't "blow" This was a liquid damage case. G2_EN is probably pulsing, is S5_PWRGD pulsing too?

 

[Rford]

Those resistors don't "blow" This was a liquid damage case. G2_EN is probably pulsing, is S5_PWRGD pulsing too?

It's hard to say liquid damage. But I did mean corrosion on those two when I said "blow". It would be weird because there is no other evidence of liquid infiltration. Just those two little r's. Nonetheless S5_PWRGD and G2_EN are both pulsing all over the place.

 

[dukefawks]

Check for short on 3V3_S5, else it could be crap under SMC or bad TPS51980.