A2179 (820-01958) 5V

[kashitozu]

Hello,

At first the MacBook stayed on 5v

I saw that the U3100 component with the thermal camera was heating up, so I replaced it,

now it goes up to 20v but I have no display

with the battery: at startup it rises to 0.80mA then stabilizes at 0.50mA

Without the battery: on start-up it rises to 0.36mA then stabilizes at 0.10mA

my keyboard, battery and trackpad work perfectly, I have other A2179s that work, I've done cross-tests and everything works perfectly.

 

[2informaticos]

Do you get voltage on big coils?

 

[kashitozu]

i have :
5v L7670
3V L7690
12V L7030
0V L7400
0V L8410
0V L8100
0V L7210
0V L7220
0V L7230

what else do you want me to test

 

[2informaticos]

Any history fault available?
Is it recognized into DFU?

 

[kashitozu]

i have change the nand now its recognized with Apple Configurator but i have that. i know its iCloud but how do I get it out of this mode

 

[2informaticos]

Padlock logo in AC2, means the DFU process has successfully completed.
It is not related with any Apple restriction.

Be aware of scammers, if you search on Internet someone to unlock iCloud; if is the case.
You can check at https://checkm8.info/es/desbloquear-icloud-en-mac-pc more information.

 

[kashitozu]

but i have no display is normal ?

 

[2informaticos]

There may be problems with some secondary power supplies; or accessories.
Did you test the board alone on the desk?

 

[kashitozu]

what do u want to say when u say id you test the board alone on the desk

 

[2informaticos]

Remove the board from case and test it connecting just the charger.

 

[kashitozu]

the motherboard take 20v and go to 0.35mA and down to 0.10mA

 

[2informaticos]

Really mA, or A?
I'm pretty sure, USB tester can't measure 0.35mA (350 microamper).

Did you check voltage on the big coils?

 

[kashitozu]

exactly 0.10 milliamper
i have say up the voltage on big coils

i have :
5v L7670
3V L7690
12V L7030
0V L7400
0V L8410
0V L8100
0V L7210
0V L7220
0V L7230

 

[2informaticos]

"exactly 0.10 milliamper"
So your USB-C meter can read 100 microamper; really???

When your meter bounce from 0.35A (350 miliamper) to 0.1A (100 miliamper), do you note any pulse on the coils listed with 0V?
Check if all G3S voltages are present.

 

[kashitozu]

i replaced the nands that i took from a working a2159 motherboard and soldered them on, i put it in dfu mode and restored and at the end of the restore i have a padlock on the mac for apple configurator that appears but i have no display on the a2179.

 

[2informaticos]

Same voltage on big coils now?