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820-01949 with bad CD3217

I

iMuhtaseb

Member
Hello,

A 820-01949 came in with one port not working at all and all three giving 5V..
I marked the bad CD3217 and it was U3100_T.
I was able to verify it was bad by measuring PP5V_S4_XT_USBC; it was 0.045 (diode mode) shorted to ground.. where it should be 0.200+

My question is; I don't have a 820-01949 to take the CD3217 out of.. cause I read online CD3217 now are programmed and need to be taken off of an exact donor; is this true? The board I have with CD3217 is 820-01700..
 
I

iMuhtaseb

Member
I went ahead and took of a CD3217B12 from 01700 and swapped it with the bad U3100-T (CD3217B12) on 01949; both ports on the left side now cycles whilst at 5V..
 
I

iMuhtaseb

Member
That cycle is apparently caused by the DC-in flex board.. now I'm stuck and I believe a need a CD3217B12 from the same model
 
2informaticos

2informaticos

Administrator
Staff member
Peoples claim on Internet to have problems soldering CD3217 chips from other boards to 01700.
Not sure if vice versa is valid also.

CD3217 chip has firmware, like CD3215/8, or TPS65982/8 too.
Code termination identifies the firmware usually.
But you can expect any weird issues from Apple.

Power cycling may be caused by a probelm with a secondary power supply from MLB.
Is the machine recognized in DFU?
Do you get stable PPBUS_AON and 3V8_AON?
 
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