Macbook air no power(a2179)

[amirDZ]

I have a MacBook air with unstable ppbus. In the tester I have 5v after a few seconds it goes down to 3 then to 0v and so on constantly. The t2 chip and the controls get hot. Ppbus has 12v as if the charging IC is fine but after a few seconds it drops the voltage and goes up again. Do not have p5vg3s

 

[admin]

I have a MacBook air with unstable ppbus. In the tester I have 5v after a few seconds it goes down to 3 then to 0v and so on constantly. The t2 chip and the controls get hot. Ppbus has 12v as if the charging IC is fine but after a few seconds it drops the voltage and goes up again. Do not have p5vg3s

part number of your Mainboard .

 

[amirDZ]

número de pieza de su placa base.

820-01958 A

 

[admin]

820-01958 A

PP3V3_G3H_RTC

 

[admin]

820-01958 A

you maybe need to try a dfu mode :

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

 

[amirDZ]

PP3V3_G3H_RTC

Tengo It has 3.3v but it also drops to 0 like ppbusIt has 3.3v but it also drops to 0 like ppbus

 

[amirDZ]

you maybe need to try a dfu mode :

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

tried with dfu but the Mac does the same and does not recognize the ddfu mode

 

[amirDZ]

you maybe need to try a dfu mode :

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

How do I force the dfu with the soc force dfu line?

 

[admin]

Try to force dfu mode with SOC_FORCE_DFU to 1V8_AWAKE with 1K

 

[amirDZ]

tal vez necesites probar un modo dfu:
[URL unfurl = "true"] https://logi.wiki/index.php/DFU_Mode_Restore_ (Mac) [/ URL

Intente forzar el modo dfu con SOC_FORCE_DFU a 1V8_AWAKE con 1K

DShould I put a 1k resistor on 1v8_awake? At what point?

 

[admin]

yes and must be pointed on other point on which you have the line of SOC_FORCE_DFU .

 

[amirDZ]

yes and must be pointed on other point on which you have the line of SOC_FORCE_DFU .

UPC_PMU_RESET = 0v

 

[admin]

UPC_PMU_RESET = 0v

Have done what I told you before to put a shunt between 1.8_awake and SOC_FORCE_DFU.

 

[amirDZ]

Have done what I told you before to put a shunt between 1.8_awake and SOC_FORCE_DFU.

i have yhe board in dfu, i put de resistor into soc_force_dfu and pp1v8_awake

 

[admin]

Try to restore your mac with another macbook with the same operation system.

 

[amirDZ]

Try to restore your mac with another macbook with the same operation system.

another mac no detect on dfu the board

 

[amirDZ]

Try to restore your mac with another macbook with the same operation system.

1v8 awake is in 0v

 

[amirDZ]

Try to restore your mac with another macbook with the same operation system.

PP5V_G3S = 0v