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Thank @2informaticos this resolved it. Not sure how liquid damage is related to DFu corruption. :/
The minute I start pushing into DFU mode and the meter connected to the top left port, it starts pulling above 2A and charging the battery.
Fallowed this -...
Hi Guys, this A2141 820-01700 came with liquid damage on 2 spots only:
C6466/6452 - PPBUS_G3H_SPKRPAML - 12.6V - 0.39
C9580 - PPBUS_g3H_SSD0_SNS - 12.6V - 0.39
The only short I located apart from than CPU Phase lines is on
PP0V9_SLPDDR - 0.049
PP0V82_SLPDDR - 0.032
PPVDCPU_AWAKE - 0.010
Managed to measure these, but cant the rest, impossible without ripping the trackpad cables. This board also doesnt turn on without a battery.
J4401 Diode mode reading between two boards are identical on J4401
Got a spare A1707, placed this board into spare casing and same error message.
Placed working A1707 in this one's case and touchbar and everything else is working.
Any areas I should cross-compare measurements of while I have them both here? u3900 is shielded but will take measurements of the...
PMU_TO_SOC_RESET_L Goes 1.79V when it turns on
Tried another touchbar, stuck at the same message, however no light on the brand new and used touchbar with a case. Suspecting something touchbar related on the board?
Resistors seems fine. Slight oxidation around underfilled SSD chips shield and...
Passes all Apple diagnostic tests. Geniuses said its a faulty TouchBar
Tried most of these - https://repair.wiki/w/A1706_2016-2017_13”_Touchbar_MacBook_Pro
Disconnected the Touchbar as it was showing only yellowish background
Wiped the drive and reinstalled High Sierra - It installed properly...
This board is a return case with liquid damage from 2 years ago. Not sure if related.
Stoped turning on, Seems like a screw got loose and got stuck between the GND of C7323 and the fan connector, Probably not related as well. Cant measure any direct shorts anywhere.
All voltages until...
End up being shorted PP5V_S4. Shocking how it was turning on and functioning with shorted S4 rail.
Replaced UB700 as it had short on PVCC line. R3501/6 measured fine but had little dots on top. Replaced in case.
A1706 820-00239 which had extensive liquid damage.
Located and removed the short on PPBUS_G3H. Now turns on, charging and works fine. Passes Apple Diagnostic. The only issue seems to be not USB and HDMI output via either of USBCs. No light on a USB drive.
Tried SMC reset. Another strange thing...
The issue with OL was a bad pad on this particular CD3217, but others I have tested were ok. The pads on the board are fine, so far. Not sure how many more attempts I can do before I rip at least one away.
I am suspecting the Shorted Cap I measured. So I lifted up the NoMarking BGA IC and the...
USBc ports were cleaned and I am testing with a clean one on the desk.
Cross matched the CD3217 with others and the readings are the same. Here are the readings of the CD3217 I worked on (measurements are on the chip side legs).
It is a bit odd that I have one resistor and one capacitor...
Replaced 3 different CD3217 chips on the place of this burned one, albeit they all came from a donor board. I still can't get them to switch to 20V when USBc is connected.
Other 3 ports seems to go 5V 0.25A -> 0.005A when connected. While this one with burned CD3217 stays at 5V 0.003A and won't...