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MacBook Pro M1 - 820-02020 stuck on 5V 0.21A

R

ronaldo

Member
I need help on these please.
I got this Mac with no power, dead.
There was a bad corrosion on the one of the CD3217 (UF400)
All the pins from USBC0_CC2, USBC0_CC1 and UPC0_R_OSC was welded and a whole on the board.
I have rebuild the tracks and soldered a CD3217 from a M1 air.
I replaced U5200 with a good working one. Just in case.
It is now stuck on 5V.
LDO regulators that output ~3.3V and ~1.5V are present.
F5200 - PPBUS_AON - 12V
PP1V25_S2 - 1.22V
PP3V3_S2_UPC - 3.29V
PP1V8_S2 - 1.8V
USBC0_3V3LDO_EN - 1.8V
UPC0_SS - 0V
PPVBUS_USBC0 - 5.16V
 
R

ronaldo

Member
It gets different readings on another board on PPVDD_DISP_S1
The board I'm trying to fix is 0.083

Other the other boards is 0.144
 
R

ronaldo

Member
Hi.
I am still trying to get this LB fixed.
I bought another working LB with iCloud locked and replaced both CD32, U5700, U5200 (ISL9240 I) and the U8100 (TMLT46B0-JPE).
The behaviour still same.
PPDCIN_USBC_AON (5.15v)
PPVBUS_USBC0 / PPVBUS_USBC1 (5.15v)
PP3V3_S2SW_USB0 / PP3V3_S2SW_USB1 (3.30v)
PP3V3_UPC0_LDO / PP3V3_UPC1_LDO (3.30v)
PP1V5_UPC0_LDO_CORE / PP1V5_UPC1_LDO_CORE (1.58v)
PD_UPC0_MRESET / PD_UPC1_MRESET (0v with multimeter)
UPC_PMU_RESET_3V3 (0v with multimeter)
PPDCIN_USBC_AON 5V
PPBUS_AON 12v
PP3V3_AON 3.3v
PP5V_AON 5v
PP3V3_UPC*_LDO
I2C_SMC_UPC_SCL and I2C_SMC_UPC_SDA starts at 1.2v then dropes to 0.9v
Can you help me with that?
 
Last edited:
R

ronaldo

Member
I rebuilt the tracks again on the UF400 and soldered it back, but the behaviour is the same.
I have replaced both controllers, UF100 and UF00,0, just in case.
Now it recognises in DFU, but fails with the error message. Trackpad is clicking.
Give up waiting for the device to transition from DFU state to DFU state [com.apple.MobileDevice.Mobile-Restore - 0xFCA (4042)].
While in dfu PPBUS is 12.28V, after it fails it drops to 9.7V.
All the components around USB-C controller are measuring fine.
 
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