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820-00928-04 stuck 5v

M

MarcinRdm

Member
Macbook 15 Pro A1708, stuck 5v. Any idea ?

UB300
CB300: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 0v,
Diode Test on LDO Rails:
PP3V3_UPC_TA_LDO: on CB308: 3.3v, diode-mode: 0,492 only in one USB port
PP1V8_UPC_TA_LDOA: on CB306: 1.805v, diode-mode: 0,502 only in one USB port
PP1V8_UPC_TA_LDOD: on CB305: 1.802v, diode-mode: 0,466 only in one USB port
PP1V1_UPC_TA_LDO_BMC: na CB304: 1,1v diode-mode: 0,483 only in one USB port

UB400
CB400: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 0v
Diode Test on LDO Rails:
PP3V3_UPC_TB_LDO: on CB408: 3.3v, diode-mode: 0,486 only in one USB port
PP1V8_UPC_TB_LDOA: on CB406: 1,8v, diode-mode: 0,502 only in one USB port
PP1V8_UPC_TB_LDOD: on CB405: 1.8v, diode-mode: 0,467 only in one USB port
PP1V1_UPC_TA_LDO_BMC: na CB404: 0v, diode-mode: 0,484 only in one USB port

U3100
C3100: 3V3_G3H: Diode-Mode: 0.332
3V3_G3H: 0V
Diode Test on LDO Rails:
PP3V3_UPC_XA_LDO: on C3108: 3.383v, diode-mode: 0,486 only in one USB port
PP1V8_UPC_XA_LDOA: on C3106: 1.815V, diode-mode: 0,504 only in one USB port
PP1V8_UPC_XA_LDOD: on C3105: 1.799v, diode-mode: 0,469 only in one USB port
PP1V1_UPC_XA_LDO_BMC: on C3104: 1.118 , diode-mode: 0,486 only in one USB port

U3200
C3200: 3V3_G3H: Diode-Mode: 0.331
3V3_G3H: 0V
Diode Test on LDO Rails:
PP3V3_UPC_XB_LDO: on C3208: 3.377v, diode-mode: 0,489 only in one USB port
PP1V8_UPC_XB_LDOA: on C3206: 1.802v, diode-mode: 0,502 only in one USB port
PP1V8_UPC_XB_LDOD: on C3205: 1.798V, diode-mode: 0,469 only in one USB port
PP1V1_UPC_XB_LDO_BMC: on C3204: 0v ,, diode-mode: 0,485 only in one USB port
 
2informaticos

2informaticos

Administrator
Staff member
Did you check for 1V1 LDO at U3200 and UB400 connecting charger on their port?

USB-C ports switch to 20V if known good battery is connected?
Any history fault available?
 
M

MarcinRdm

Member
Board isn't necessarily clean but no liquid contact or relevant visible corrosion. 5v with battery. I have replaced some suspect capacitors.
1V1 LDO is present on U3100 and U3200 - on a dedicated USBC connector
UB300 and UB400 has no voltage of 1.1v - on a dedicated USBC connector
Now I have
3V3_G3H - 0.16v
PP3V3_G3H only 2.8v
D6902 pin 1 5v pin 2 0.120v pin 3 4.8v
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
There is a problem on UB300/400 area.
Check UB090 solders, traces and surrounding resistors.
Also check all resistors from pages 104/5; you may need to check page 103 too.

"3V3_G3H - 0.16v
PP3V3_G3H only 2.8v"
Where did you measure, isn't the same power rail?

Check all R6910-13 resistors.
Also check C6907 and R6908.
 
M

MarcinRdm

Member
C6907, R6908, R6910-13 are ok
my mistake PP3V3_G3H 0.16 I thought about PPBUS_G3H
Can two CD3215 chip be damaged ? whether to focus on UB300/400 area.]
 
M

MarcinRdm

Member
UB090 and component are ok. I saw that the UB300 was warming up and replaced it. Now I have 1.1v on all CD3115 but still only 5v.
 
M

MarcinRdm

Member
I don't understand it but after replacing it, once is 0.1v and sometimes around 0.02v. regardless of the usb-c connector.
 
2informaticos

2informaticos

Administrator
Staff member
Replace what?
Need to see if you get PPBUS_G3H when F7000/1 fuses are removed.
We know then if the problem is on U7000 side, or system side...
 
M

MarcinRdm

Member
Sorry. I misunderstood you and replaced the F7000 / 1.
Without F7000 / 1 it is 0.01v on C7050
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
So you have a problem on U7000 area, or no communication between SMC and U7000.
Post PPBUS_G3H voltage with battery connected; w/ and w/o charger connected.
Test with known good battery, which holds some charge.
Check if board tries to turn on then, triggering SMC_ONOFF_L.
 
M

MarcinRdm

Member
I soldered the F7000 / 1.
With battery i have 20v but
PPBUS_G3H with battery 11.56 v
PPBUS_G3H without battery 0.05 v
SMC_ONOFF_L 3.4v
 
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