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820-00239-A 20v on PPDCIN_G3h_CHGR, 0.77v on PPBUS_G3H

C

Capri1

New member
Hi,

I am working on an 820-00239-A. Charger was stuck at 5V, after replacing UB400 I'm getting 20V 0,0A on other 3 ports, the port UB400 is responsible for is still stuck at 5V.
PPBUS_G3H is 0.77v.
PP3V3_G3H is 3.4v.

Can UB400 be responsible for PPBUS_G3H not being created properly?
 
C

Capri1

New member
Thank you for your time so far.

The voltages I could measure are:

PM_EN_P3V3_G3H 5.00V
PPVBAT_G3H_CHGR_REG 0.776V
PPVBAT_G3H_CONN 0.776V
TBA_BGATE 0.2mV
TBA_BOOT1 4.70V
TBA_BOOT2 4,74V
TBA_CSO_N 0.776V
TBA_CSO_P 0.776V
TBA_GATE_Q1 2.8mV
TBA_GATE_Q2 0V
TBA_GATE_Q3 0V
TBA_GATE_Q4 2.8mV
TBA_LX1 2.8mV
TBA_LX2 2.8mV

I then accidentally shorted SMC_RST_L and PP3V3_G3H at R7009 and R7090 while measuring.
Now PM_EN_P3V3_G3H is missing so I think I fried U7000.

I already ordered a replacement for U7000 and have to wait for it.
 
2informaticos

2informaticos

Administrator
Staff member
Sorry to hear that.
Pay more atention when you work on these new boards.

BTW, basic pins are P_IN, AUX_DET, VDDA/P, MPM_PBUS, VR1_3P3, EN_VR1, SMC_RST*, AUX_OK, CBC_ON, A/BMON.
 
C

Capri1

New member
Hi

I replaced U7000 now.

P_IN 20.17V
AUX_DET 5.01V
DDA 5.13 V
DDP 5.13V
MPM_PBUS 19.81V
VR1_3P3 3.327V
EN_VR1 5.12V
SMC_RST* 3.331V
AUX_OK 3.331V
AMON 15mV
BMON 2mV

for CBC_ON I could not find a probe point on the board view.

PPBUS_G3H is still 0.77v.
 
2informaticos

2informaticos

Administrator
Staff member
I'm wondering how can you get 4.1V in diode mode :eek:.
Did you test with red probe at ground and black probe at PPBUS_G3H???
Disconnect charger and battery; allow 10s before diode mode test.

BTW, forget the "V" when you post diode mode reading.
 
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