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01598 liquid damage

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captainmac

Member
hi there
these are quite new to me still, dont get them often.
So i fixed a short on ppbus, was caused by C9074 which spontaneously died i think (liquid was not near this at all)
It's hard to find liquid on this guy, but i found some traces broken around U5111 (which i think arent critical)

Anyway, i get ppbus 12.6V now
all the G3H stuff is there, i am getting p3v3main_pgood, and P5VG3S_PGOOD
I cant really find the page with all the rails, but im trying my best.

I'm missing PP3V3_S5, which i think is being created by U7800 if im not mistaken?
Theres a giant shield over U7800 (and U3900) so am waiting to check in here first before i remove that shield and possibly ruin stuff under it.
 
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captainmac

Member
yeah sorry forgot to add the obvious: board is asking 20v and draws 0.00amps

LDOs from U7800:

LDO_CORE = 1.50V
PP0V8_SLPS2R = 0.8V
PP3V_G3H_RTC = 3.0V
PP1V2_AWAKE = 1.20V
PMU_LDO3_OUT_R = 1.8V

PP3V3_G3H_PMU_VDDMAIN = 3.29V
 
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captainmac

Member
ok, i was under the assumption these would start automatically when charger is connected.
I realised there was a power diagram yesterday and indeed saw that same sequence, so tried triggering PMU-ONOFF_L to ground with tweezers while measuring PP3v3_S5: but no response, no pulsing either.
 
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captainmac

Member
so following the power on sequence:
I am having everything up until SSD0_OCARINA_WP_L
Have no idea where that's from (i'm assuming PMIC here)

SSD0_OCARINA_PFN is there at 1.8v
SSD0_OCARINA_RESET_L is 0.0v
 
2informaticos

2informaticos

Administrator
Staff member
The board should start by itself when charger is connected; if no battery connected.
PMU_ONOFF_L is needed to turn on the board only if battery alone is connected (no charger).

Looks like T2 is not able to access dedicated partition on SSD.
Try DFU restore, just in case.
 
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