macbook A1932 820-01521

[ipetro]

Hi all ! I really need help with my motherboard! consumption 20V / 0.060-0.280 A is unstable! not detected in DFU! There is no picture on either the external or internal monitor!
PPBUS_G3H=12,61v
PPBUS_HS_CPU=12.61v
PPDCIN_G3H=19.94v
PP5V_G3S=5.12v
PP5V_S5_LDO=5.12v
PP3V3_G3H_RTC=3.3v
PP3V3_G3H=3.3v
PP3V3_G3SSW_SNS=2.3-2.6v is unstable!
PP3V3_G3S=3.3v
PP3V3_TBT_X_S0=0v
PP2V7_NAND=2.513v
PP1V8_G3S=1.8v
PPVCC_S0_CPU=0v
PP1V8_SLPS2R 1.8v but 0.003 diod mode

 

[2informaticos]

Any history available?
Liquid sign on audio board?

0.003 in diode mode is very low.
Disconnect J6100/700 and check again.
If still low, inject voltage and use an IR camera; may not be able to detect the heat with your fingers.

 

[ipetro]

story: turned off and won't turn on! The entire board is flawless as from the factory, with the exception of the space between Q7680(PIN1,2) and Q7660(PIN3,4,2) , small oxides from liquid ingress!
This is the testimony that is in the post on the removed board on the table! nothing is connected to it

 

[ipetro]

the only thing that even gets hot on this board is 2 tsd3215 and t2, very faintly visible on the thermal imager

 

[2informaticos]

Remove U3100/200 (one by one) and check again in diode mode.
If still low, may have bad T2.

 

[ipetro]

PP1V8_SLPS2R this line was bad in the CD 3215, after replacing the MacBook it is detected in the DFU. but after a long recovery an error appears: what does it mean?

 

[2informaticos]

I never saw 2005 error; not sure what to say.

Did you try restore with good battery and trackpad connected?

 

[ipetro]

fully assembled with good battery another error.

 

[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

 

[ipetro]

The MacBook turned on but there is a but! I can’t complete the activation!

 

[2informaticos]

The MacBook must be removed from the actual Apple account first!
I tell you this from experience.
Even if no service is enabled on the account, you can't go away untill delete it from Apple.

 

[ipetro]

Apple support doesn’t understand why he doesn’t connect to their server and can’t help! THE BEST)))

 

[ipetro]

I deleted it from my icloud account but it didn't change anything!

 

[2informaticos]

It is really removed from Apple account?
Check again if doesn't appear there.

 

[ipetro]

could the problem be due to the BIOS?

 

[2informaticos]

We don't have access to BIOS on T2 machines.
Anyway, BIOS should be restored in DFU.

You can try DFU restore with empty SoC ROM (U4770); that is not BIOS chip!
Didn't help in my case.
Problem was solved once MacBook was removed from Apple account.

 

[ipetro]

I apologize for the stupid question, but what role does the SoC ROM play? The serial number, as I understand it, is registered in the SoC ROM?!

 

[2informaticos]

Yeah, the serail is there.
Not sure what else T2 keeps there.
In DFU process, it will be reflashed anyway.