820-02899 - 5V / 0.020A

[2informaticos]

Which schematic use for diagnostic?

 

[thomamagic]

820-02016-07

 

[2informaticos]

I never understood why people like to check that coil.

Any fault history available?
Is the machine recognized into DFU?

 

[thomamagic]

"I never understood why people like to check that coil." because lot of times you say test big coils

No history available. Dead directly
This machine not recognized in DFU mode

 

[2informaticos]

"because lot of times you say test big coils"
I never mention charger coil on my list, for this kind of back-boost converter!

Check U8100 and U7700 LDOs.

 

[thomamagic]

Ok i check tomorrow LDOs

For information i have test to replace UF400 and UF500 and same

 

[thomamagic]

all LDOs are good

 

[2informaticos]

In such case, machine should be detected in DFU.
Tried external switch method?

 

[thomamagic]

Have test in case but not enter in dfu
What is external switch method please?

 

[2informaticos]

DFU Mode Restore (Macs) - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area

logi.wiki

 

[mgladin]

I recently had a MacBook Pro do the same thing, and it was the USB-C Controller. For your model, I believe it is the CD3217B12 IC. There should be two, and both should be replaced if that is the issue. I would check around there.