820-02016 5V 0,04A

[raainxx]

Hi,

I have an A2337 (820-02016) with 5V and 0.02A and 0.04 A (cycling reboot my tester USBc) on both USB-C ports.

- PPBUS_AON = 11.99V
- PP3v8_AON_VDDMAIN = 3.8V
- PP5v_S2 = Missing
- PP3v3_S2_UPC = Missing
- PP1v25_S2 = Missing
- PP1V8_S2 = Missing
- PP3v3_UPC0_LDO = 3.292V
- PP1v5_UPC0_LDO_CORE = 1.58V
- PP3v3_UPC1_LDO = 3.297V
- PP1v5_UPC1_LDO_CORE = 1.584V
- PPDCIN_AON_CHGR_R (without battery) = 5,131V

Is the firmware bad? (When I turn on the MacBook - fully assemebled - it doesnt go into recovery/DFU automatically) - So I assume the firmware is good?

Not possible to get it into DFU mode.

 

[2informaticos]

You can't access DFU without 1V25_S2.

Check U8100 and U7700 LDOs; voltage and diode mode.

 

[raainxx]

thanks for your answer
U8100 LDOs
PP1V2_S2=1.1V , diode=0.328
PP3V3_S2_UPC=3.3V diode=0.458
PP1V8_AON_MPMU=1.8V diode= 0.366
MPMU_VREF_ADC=1.47V diode 0.158

U7700 LDOs
PP0V72_S2_VDD_LOW=0.740V. diode=0.270
PP1V2_AWAKE_PLL 1.199V diode=0.380
CAP_PPSPMU_VLDO9=1.803V. diode=0.5
PP0V855_S2SW_CIO=0.747V diode=0.249
PP0V805_S1_VDD_FIXED=0.8V diode=0.249
PP1V2_S2_CIO=1.2V diode=0.394

 

[2informaticos]

Check diode mode on BUCKxx outputs of U8100 & U7700.

 

[raainxx]

buck seems normal (flexbv database diode mode).
do you want all value?

 

[2informaticos]

Any of bucks voltage appears?