820-3642 (A1425) - PP3V3_S5 almost full short

[djdblaster]

Water damaged around C9687, down below from DC Jack. Cleaned in UC, tried booting. 55mA. Pulled U2600 out, found PP3V3_S5 0.0017 diode mode. Tried injecting 3.3V there, U1800 gets warm.

Am I screwed? Maybe just for test lift all caps in damage area where liquid was?

 

[JohnB8812]

If you started the board without U2600 soldered on, forget it this is done. If 3v3_S5 is shorted and the CPU is all that gets hot, this can also RIP.

 

[djdblaster]

No, I haven't started without U2600. What I found partially shorted is:

PP3V3_S5 - 0.017
PP3V3_SUS - 0.016
PM_SLP_S4_L - 0.060

 

[JohnB8812]

Measure resistance to ground in ohms. Shorted is shorted however.

 

[djdblaster]

PP3V3_S5 - 46 Ohms
PP3V3_SUS - 42 Ohms
PM_SLP_S4_L - 162 Ohms

 

[2informaticos]

Looks like bad PCH.
Both power rails go there and PM_SLP_S4_L is controlled by it too.