820-00281 PPBUS_G3H 0.14V and 5V 0.45A from charger.

ajdoc

Member
Board got very small liquid damage on U7370 and U7210 :( an on U6300, C3980, CB701

PPBUS_G3H on F7000 got 0.14V and 0.420V in diode mode.
Big coils 0.001V in diode mode and 2 Ohm resistance to ground.

PP3V3_G3H = 3.40V

Removed F7000/1 and on pad 1 got 0.14V

Any idea where to start?
 

2informaticos

Administrator
Staff member
Not short maybe.
You should compare with good board with same CPU.
i7 will give lower resistance on CPU core, as normal; no idea what CPU had the board I tested.
 

ajdoc

Member
Would like try to replace U7370 as it is liquid damaged and got a question:
It is SIC535 and it will compatible with SIC532?

Another questions about CPU mosfets:
I see on boards SIC635, FDMF5804/08 - are they compatible or each of them are unique?
 

2informaticos

Administrator
Staff member
If you find different chips in the same position on identical boards, then they are compatible; unless someone changed by error.
Sometime you can find equivalents searching on Internet; remember the case of FDMF6808 and FDMF6708/3030.
 

ajdoc

Member
Replaced U7370 (SIC635) just in case and the same issue but when battery is connected there is 20V and 0A from charger - is there any hope?
 
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ajdoc

Member
W/ batt got 20V and 0A from charger.
W/o batt got 5V and 0.044A from charger.

PPBUS_G3H w/o batt = 0.23V (on F7000)
PPBUS_G3H w/ batt = 10.3V

PPBUS3_G3H got 0.420V in diode mode.

All LDO's reading in diode mode are OK on all four CD3215's.
PP3V3_G3H = 3.340V
 
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ajdoc

Member
P_IN = 5.15V
AUX_DET = 1.29V
VDDA = 5.05V
VDDA = 5.07V
SMC_RST_IN = 0V
EN_MVR - can't find that on that board, but I found EN_VR = 5.08V
AUX_OK = 3.40V
AMON = 0V
BOM = 0V
 

ajdoc

Member
SMC_USBC_INT_L = 0V
Checked that on R3038 and other side is PP3V3_G3H = 3.34V.
R3038 got correct resistance.
 

2informaticos

Administrator
Staff member
Incorrect level, must be high.
One of CD3215 chips pulled it down probably.
Do you get 1V1 LDO on all CD3215 chips?

Remove USB-C connectors from shell and inspect their terminals.
You should also compare diode mode readings on J3100 and JB500 (with good board).
 

ajdoc

Member
All 1V1 LDOs was present.

Removed one CD3215, checked SMC_USBC_INT_L and was still stable at 0V, removed another one and then I saw pulse/spike. Putted back second chip and again was flat 0V. Replaced it with new chip and all works fine.
WOW - thank you very much for all ideas. That will help me a lot in the future. Learnt a lot from that one :)

At some post about display issue on logic board you recommend me S-EM2 EDDP & USBC Meter - do you think in that case from this post it could help?
 

2informaticos

Administrator
Staff member
On this machine, it helps to detect bad diode mode readings on J3100 and JB500.
Many of these lines are connected directly to CD3215 chips.
But these chips may have internal problems which don't affect the input lines.
 
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