820-01700 with 5v only [SOLVED]

nik1981

Member
Hello, I have an 820-01700 that won't power on. No signs of liquid. Just stopped charging.

With the board out, on 3 of the ports I get 5.12v 0.37-0.39a and the 4th port (left side front) I get 5.14v but only 0.13a.

With the 3 ports I get 12.2v constant on PPBUS but 0v on the low port.
If I switch for a different dc in board, I get the same readings

I'm not sure where to start with this.
 

nik1981

Member
For U3100:
C3108 - PP3V3_UPC_XA_LDO is only 0.021v
C3104 - PP1V5_UPC_XA_LDO_CORE is only 0.019v

but for U3200, the same caps are around 0.453v

So U3100 is the problem?
 

nik1981

Member
Replaced U3100 today and the low resistance went away, the MacBook works perfectly now.
Thank you for your help as always 2informaticos.
 
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