820-00840 20V 0A

raainxx

Member
Hi,
on this board, I get 20v 0A and ppbus_g3h 1V with no short (diode mode 0,250)
At U7000
Aux_det 5v
R7020/21/61/62 are ok
TBA_HPWR_EN_L 3.4V
PM_EN_P3V3_G3H 5V
SMC_RESET_R_L / SMC_RESET_R 3.4V
SMC_CHGR_INT_L 3.4V
CHGR_ACOK 3,3V
SMC_RST_IN 0V
PD_SMC_CBC_ON 0V
R7075 is 5ohms and TBA_VDDA is 5V
VR1_3P3 is 3.4V
A/BMON 0V
TBA_COMP is 1,125V noticed it was 1,6 and 1,5V on working board

What can I do?
Thanks
Best regards
 

raainxx

Member
no I don't change U7000, I haven't new one but I have board to keep it but I don't know if U7000 is good.
I try and come back
 

2informaticos

Administrator
Staff member
Check if you get same voltages above mentioned.

Remove F7000 and check C7050 voltage then.
Be sure 3V3_G3H has correct voltage.
 

raainxx

Member
i have C7050 without F7000 13V with F7000 1V, I think it's a short on PPBUS but small short (diode mode 0,250)
3V3_G3H is OK 3,4V
 

2informaticos

Administrator
Staff member
What is diode mode on PPBUS_G3H in reverse way (black probe at ground)?
Compare with the readings on all big coils.
 

2informaticos

Administrator
Staff member
Do you get 0.250/0.900 at PPBUS_G3H and L7900 too?
0 ohm between both power rails means Q7900 is shorted.
Remove it and check again.
 

raainxx

Member
L7670=0V
L7690=3,3V
L8410=0V
L7030=4,968V
L7900=L8060=1V
L7370=L7220=L7210=L7410=L7420=L7430=L7730=L8030=L7960=0V
 
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