820-00875 PPBUS_G3H boosting after liquid damage

nik1981

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nik1981

Member
After the board went through the UC, it actually looked great. Obviously something is bad but all the liquid damage appears to be at the DC end of the board
 

nik1981

Member
When the battery is connected, I get 12.6v on PPBUS_G3H.. 0v when only on the charger though
 
Last edited:

2informaticos

Administrator
Staff member
Puff, liquid spill close to backlight output; that's big danger for the new boards :(
Supposedly problem with USB-C controllers...
 

JohnB8812

New member
Yeah that's quite a bit of liquid damage. Do you get 5 volts on DC in for both ports currently? How do the chargeports look currently badly burned or OK?
 

nik1981

Member
I get 5.2v on both ports. The charge ports look perfect, all the fuzzy coating came off in the UC and no pins etc are burnt or tarnished.

Any ideas?
 

JohnB8812

New member
Ok is PP3v3_G3H present, slightly low, or missing? Being there was liquid near the CD3215s I would not surprised if they are an issue.
 

nik1981

Member
PP3v3_G3H isn't present on charger (expected) or on battery. Both show 0.0v

Its near on impossible for me to test around U6990 on battery but on the charger I get 5.2v on D6905 pin 2 5.1v on pin 3
On D6990, I get 5.1v on pin 2 but 0.0v on pin 10 enable.
 

2informaticos

Administrator
Staff member
PP3V3_G3H enable comes from U7000.
As SMC requires this voltage, problem should be on U7000 area, not on USB-C controllers, nor SMC.
Cannot have communication between them, without PP3V3_G3H.
 

nik1981

Member
Pin 27 on U7000 is a direct connection to Pin 2 of R6991 from what I can tell.
As I'm not getting anything on R6991 I wanted to look at U7000 to see if it is even getting the voltages it needs, but I'm not good enough at understanding the schematic just yet.

Could someone better than me let me know what voltages I need around U7000 to feed U7000 please. That way I can see if it needs replacing or its something feeding it thats is the issue.
 

nik1981

Member
Thank you 2informaticos..

Pin 10 - P_IN = 5.16v
Pin 18 - AUX_DET = 1.28v
Pin 2 - VDDA = 1.39v
Pin 17 - VDDP = 1.39v
Pin 28 - SMC_AUX_OK = 0.0v
 

nik1981

Member
What should VDDA and VDDP be showing as? I'm assuming SMC_AUX_OK should be outputting something also but it looks like that needs 3v3 too
 
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