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820-00850 5V 0.250A

No-Clean

No-Clean

Member
Board had a shorted U6903 line P3V3G3HRTC_PHASE1 after replacing that and all 4 CD3215s board now stays at 5V and 0.250A

I have all voltages all the way up to PMU_COLD_RESET_L working fine, PMU_PVDDMAIN_EN and after (following the power sequence diagram) are all 0V

PPBUS 12.27V
PP3V3_UPC_XB_LDO 3.3V
PP3V3_G3H_RTC 3.3V
PP1V8_UPC_XB_LDOD 1.8V

When trying DFU restore machine doesn't even enter DFU

Im stuck, any help will be greatly appreciated.
 
Last edited:
No-Clean

No-Clean

Member
I forgot to post the rest of the info, here it is.

PPBUS 12.27V
PP3V3_UPC_XB_LDO 3.3V
PP3V3_G3H_RTC 3.3V
PP1V8_UPC_XB_LDOD 1.8V

PP1V2_AWAKE: 1.2V
PP1V8_AWAKE: 1.8V
PP3V3_AWAKE: 3.3V
PPVDDCPUSRAM_AWAKE: 0.8V
PPVDDCPU_AWAKE: 0.75V
PVDDCPUSRAMAWAKE: 0.8V
P1V1SLPS2R: 1.1V
P1V8SLPS2R: 1.8V
P1V8SLPS2R: 0.8V

When trying DFU restore machine doesn't even enter DFU
 
2informaticos

2informaticos

Administrator
Staff member
"P1V8SLPS2R: 1.8V
P1V8SLPS2R: 0.8V"
This is very unclear for me.

BTW, I didn't ask to post these voltages.
If one is not good, tell us then.
If all are present, machine must be seen in DFU.
Be sure to follow all the steps in the tutorial linked on the forum.
 
No-Clean

No-Clean

Member
Sorry P1V8SLPS2R is 1.8V

I have never had issues putting a Mac in DFU, but I will try again tomorrow.
 
No-Clean

No-Clean

Member
Ok just to get it out of the way I tried again to put it in DFU following the tutorial and had no luck, I even tried in a different Mac, different cable, different USB-C port board ( I swapped it with a new one ) but never enters DFU.
 
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