Hi Mon2
just an update
i arrived to put the MAC in DFU state. I tried 2 things
Revive --> error (75).067E.004B.
Restore --> error code (9)
I dont know if it can help, i didn't arrived to find something on internet...
No Lan
Member
Last Activity: 08-26-2026, 10:24 AM
Joined: 04-03-2025
Location: FR IDF
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There are no composant at all on SOC_RED_SLPS2R maybe it is why it's stuck at 0v
I think its is T2CHIP or PMIC like you say..
Nothing to do so..
Thanks you...Leave a comment:
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I took ALso these measurement
PMU_CLK32K_SOC : loop 0 to 0.9v
I2C_PWR_SCL/SDA : Loop 0v to 1.8vLeave a comment:
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OOh Okey great News !! Maybe a chance to survive
regarding S2R- PP1V2_S2R/PP1V2_AWAKE :LOOP 0v to 1.20v (DIODE O.476)
- PP0V9_S2R/PP0V9_SLPDDR : LOOP 0v to 0.90v (DIODE 0.031 - LOW)
- PP3V3_S2R/PP3V3_AWAKE : LOOP 0v to 3.37v (DIODE 0.606)
P1V1SLPS2R_FB : 0.75v
P1V1SLPS2R_SW0 : 1.1v
P1V1SLPS2R_SW1 : 1.10v
P1V8SLPS2R_FB : 1.8v
P1V8SLPS2R_SW0 : 1.8v
PP0V8_SLPS2R : 0.8v
PP1V1_SLPS2R : 1.10v
PP1V25_SLPS2R_SMC_AVREF : 1.25v
PP1V8_SLPS2R_SOC_LPADC_RC : 1.81v
SOC_RED_SLPS2R : 0v
======================================================...Leave a comment:
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Hello Mon2,
##Before desolder and resolder##
NOT SHORTED
R8010 ; SOC_FORCE_DFU side : 0V
R8010 ; PMU_FORCE_DFU side : 0V
SHORTED
R8010 ; SOC_FORCE_DFU side : 1.8V
R8010 ; PMU_FORCE_DFU side : 0V
##After replacing R8010 from another 820-01949##
NOT SHORTED
R8010 ; SOC_FORCE_DFU side : 0V
R8010 ; PMU_FORCE_DFU side : 0V
SHORTED
R8010 ; SOC_FORCE_DFU side : 1.8V
R8010 ; PMU_FORCE_DFU side : 0V
SO PMU_FORCE_DFU is ALWAYS 0V
========================================================...Leave a comment:
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Hello Mon2,
i tried the last part and the MAC is not recognise. I took some measurment and there are something strange.
On the RE032 i shorted PP1V8_SLPS2R to SOC_FORCE_DFU.
On 2 different test pad and on the R8010 i have 1.8v (SOC_FORCE_DFU)
But on the other side of the R8010 i have 0v (PMU_FORCE_DFU)
PMU_FORCE_DFU : 0.650 (DIODE MODE)
R8010 : 2.2K Ohms
Do you have an idea ?...Leave a comment:
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Firstly, really thanks you for your time and clear explanation.
Here is G3S result
1)
PP1V8_G3S : 0.288 (Diode)
PP1V1_G3S : do not have it
PP3V3_G3S : 0.338 (Diode)
2)
PP0V9_SLPDDR : 0.030 (Diode) ; Looping 0v-0.9v
3)
U4770 looks perfect no damage visible
I didn't found any line starting with T2_ROM_... or SPI_VCORE_. But i found PP5V_MAIN_VCORE1 who is 5V stable
4)
okey i will try that when i will be able to have another MAC with me. Leave a comment:
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also PPBUS_G3H : 0.459 (Mode Diode)Leave a comment:
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MacBook A2251 - PPBUS_G3H unstable
Hello Team,
you are my last chance so i really hope you can help me :p
My Macbook A2251 820-01949 is no longer booting (no damage, no water nothing special).
I took some measurement and notice some rail are unstable even if 20v is stable.
Here some strange measurement, it is looping every 5-8 secondes
PPBUS_G3H : 12.37V-12.69V
R7040 (Entrée U7000) : 14V-8V
PPVDDCPUSRAM_AWAKE : 0.8V-1.06V
PP0V9_SLPDDR : 0V-0.9V
PP2V7_NAND_SSD0 : 0V-2.53V
PP3V3_S5 : 3.3V-0V
i took also some usefull measurement... -
Nobody ?
Can it be U7650 (buck converter) or U8210 (Fets) that convert PP5V_S4 to PP5V_S0.
i say that because, i measured on time 8-9v on PP5V_S0 line that is not normal.
Thaaaaanks
...
Leave a comment:
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I add antother things that i just discovered.
I tried a test using an external screen connected via HDMI.- If everything is connected (trackpad, display, and SSD) + HDMI plugged in → crash + boot loop (sometimes I reach the login screen, sometimes not)
- If only the trackpad is disconnected + HDMI plugged in → crash + boot loop (sometimes I reach the login screen, sometimes not) + see image
- If only the internal display is disconnected + HDMI plugged in → no problem, fast and stable boot
If i disconnect the HDMI
If everything is connected (trackpad, display,...Leave a comment:
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Yes I have approximatively thé same (210) on thé working One...Leave a comment:
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Sorry i was in diode mode.
Multimeter on 2000K ohms and i observe between 220 and 240 on PP5V_S0_FAN. took on C4870
FAN_LT_PWM --> OL
FAN_LT_TACH -->OLLeave a comment:
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Here the result
PP5V_S0_FAN --> 1,8
FAN_LT_PWM --> OL
FAN_LT_TACH -->OLLeave a comment:
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I cannot connect as the system keep restarting before or during login windows :/
even when starting in safe mode...Leave a comment:
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I agree with you.
with the 2 motherboard (the one for this post and the other working well) i have a high fan speed when trackpad disconnected !Leave a comment:
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Yes it is the exact same motherboard 820-00840...Leave a comment:
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Just to clarify
if trackpad is disconnected --> Mac boot with fan --> Logo Apple --> Screen for user authentication --> Stable
If trackpad is connected --> Mac boot without fan (fan work only for few second) --> Logo Apple --> Boot loop OR Mac boot without fan (fan work only for few second) --> Logo Apple --> Screen for user authentication crash and restart
for your question
PPBUS_G3H--> 13,2v
ALL_SYS_PWRGD --> 3,23vLeave a comment:
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I'm fully stable 20v and between 0,4 and 0,8A without batterie connected....Leave a comment:
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Just because I measure 9V on PP5V_S4 one times, should I be concerned that U7650 might be malfunctioning sometimes? Or is it not handling the voltage as expected?Leave a comment:
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