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820-00239 5V 0A-0.25A cycle

A

ajdoc

Member
Got 5V on charger and 0A, every few seconds it go to around 0.25A (so should switch to 20v) and then back to 0A.

Cant find any corrosion.
PPBUS 0.02V (0.440 in diode mode)

Removed F7000 and still on F7000/1 got 0.02V.

All diode valus on LDOs around all CD3215 are correct.
Voltages are correct as well (pulsing of course) just on all CD3215 PP1V1_UPC_XB_LDO_BMC is stable 0V (diode mode is correct).

Any idea?
 
2informaticos

2informaticos

Administrator
Staff member
Post U7000's basic voltages (F7000 disconnected): P_IN, AUX_DET, SMC_RST_IN, VDDA/P, SMC_RST*, AUX_OK, A/BMON.
 
A

ajdoc

Member
P_IN 5.14V
AUX_DET 1.28V
SMC_RST_IN 0.0V (0.586 in diode mode)
VDDA 5.12V
VDDP 5.12V
SMC_RST* 3.4V
AUX_OK 3.4V
AMON 0.0V (0.586 in diode mode)
BMON 0.0V (0.586 in diode mode)
 
A

ajdoc

Member
"Surely no voltage at C7050?"
Correct, no voltage (0.535 in diode mode)

Resistance (ohm scale):
C7020 2.6ohm
C7023 2.8ohm
 
2informaticos

2informaticos

Administrator
Staff member
You may need to change U7000.
I recommend to check first Q7030 and their adjacent components and traces.
 
A

ajdoc

Member
All looks fine around Q7030.
Rwplaced U7000 and same issue.

Any chance one or more CD3215 is/are faulty?
 
A

ajdoc

Member
OK, big mistake was made by me.
One of my USB C power meters has been accidentally switch to W instead of A.

Correct reading from charger:
5V and 0A - 0.04A cycles.
PPBUS_G3H on F7000/1 have 0.013V

Apologise for confusion.
 
2informaticos

2informaticos

Administrator
Staff member
The voltages for U7000 look good.
As I said, check BOTH Q7030/40 and their adjacent traces and components.
Just LOOKING isn't good enough.
 
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