820-01521 One of ports not charging.

BCN_Techs

Member
Got this board absolutly dead.

Q3100 and Q3200 was heating up while trying to boot. Replaced them and also removed and replaced shorted C7034. Now computer works fine.except of one of ports. It is U3100 Port getting 5V and 0 AMPS. Alreday tried to replace it from donor board but no changes.

On U3100 is missing PP3V3_G3H_RTC (not shorted)

P.S: PP1V1_IPC_XA_LDO_BMC also missing
 
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BCN_Techs

Member
There is continuity from R6979 to C3100. As i told there is only 1 port failing. Even when i boot with good port C3100 is getting correcto voltage.

May be than CD32 bad reballed/soldered
 

2informaticos

Administrator
Staff member
"On U3100 is missing PP3V3_G3H_RTC
-------------
There is continuity from R6979 to C3100. "
You've said that; what is actual situation?
 

BCN_Techs

Member
the key is: it is missing only when connect charger to second port (which is used for DFU) then when i have a problema.

First port is working fine.
 

2informaticos

Administrator
Staff member
You've first said no 3V3_G3H_RTC present at U3100.
Then said C3100 has conitnuity with R6979.
I expected you to explain that...
 

BCN_Techs

Member
That is exactly what happening. Just add the detail about which port is connected charger.


When i connect charger to:


Port 1 (near corner): all is working fine, getting all lines, booting mac, charging and getting all ines on both CD3215
Port 2 (used for DFU) not getting 3V3_G3H_RTC and PP1V1_IPC_XA_LDO_BMC

Already changed CD3215 twice and this is the question: if still not getting PP1V1_IPC_XA_LDO_BMC and 3V3_G3H_RTC it only can be bad soldered or deffective CD3215?
 

2informaticos

Administrator
Staff member
You didn't specify that C3100 missing voltage ONLY when connect charger to its port.
C3100 must get voltage from the other port too.

Do you get the other 3 LDOs voltages from U3100?
Compare diode mode readings with U3200.
 
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