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820-01958-A No Power 5V and 0.11A

N

Nikos

New member
Hi there.
I have an Apple Macbook Air A2179 with water damage on the motherboard around U3100 and U3200.
i cleaned the area and reball both ic.
I connected the charging cable to USB-C Meter and it started to use 5v 0.11 amp with the T2 is heating up.

Some measurements
PPBUS_G3H=12.25V
PPDCIN_G3H=5.06V
L6960=3V both sides
PP5V_G3S=0V
PP3V3_G3H=3.20V
CHGR_EN_MVR=5V
PPVIN_G3H_P5VG3S - 12,26V
PPVIN_G3H_P3V3G3H - 12,26V
PPBUS_HS_CPU=12,26V
PPVCC_CPU_PH1=0V
PPVCC_CPU_PH2=0V
PPVCC_CPU_PH3=0V
PP3V3_G3H_RTC=3.29V
PP3V3_G3S=0V
PP1V8_G3S=0V
PP1V8_S3=0V

Thanks
 
2informaticos

2informaticos

Administrator
Staff member
Check if T2 gets all SLPS2R and AWAKE required voltages; small coils around U7800.

Be sure to follow all the steps to put the machine into DFU.
You may need to force it manually.
logi.wiki

DFU Mode Restore (Macs) - LogiWiki

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N

Nikos

New member
I tried with the Keyboard method without result.
i cant use Jumper method because i get 1.8v in line SOC_FORCE_DFU

voltages SLPS2R, AWAKE and coils
L7810=0.8V
L7812=0.8V
L7811=0.8V
L7809=0.8V
L7808=0.8V
L7807=0.8V
L7806=0.8V
L7815=1.1V
L7814=1.1V
L7816=0.8V
L7817=0.9V
L7813=1.8V
L7819=0V
L7820=0V
L7822=0V
L7821=0V
L7823=0V
L7824=0V

PP1V2_AWAKE=1.2V
PP1V8_AWAKE=1.8V
PP3V3_AWAKE=3.2V
PP0V8_SLPS2R=0.8V
PP1V1_SLPS2R=1.1V
PP1V8_SLPS2R=1.8V
 
2informaticos

2informaticos

Administrator
Staff member
With these voltages, T2 should be able to enter DFU.
Having 1.8V there, is not the same as making contact with 1V8_SLPS2R.

I strongly recommend to change U3200.
It may cause that high level on SOC_FORCE_DFU.
 
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