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At the end I measured a lot of the related 5-20V circuits and all measured fine, the one sign that I could see was PPBUS at 12V even and not 12.6V. One thing I could see was that I2C_UPC_SCL and I2C_UPC_SDA was 1.2V but no data was going thru when looking with oscilloscope I did the same with a...

Missing L3095, Pulsing L7520, L7130, L7630, L7430 Steady L7560 U1950 Pins 7 & 3 pulsing. PLT_RESET_L 0V SMC bypass same thing

Board was repaired a few months ago with SMC replaced and some corrosion clean up, now is back. PPBUS 8.6V I get green then orange light on original charger. I can trace the fluctuations as early as SMC_PM_G2_EN this fluctuates around 1.1V to 1.8V. Diode reading in all related rails are ok and...

All SSD power rails are on par with working board as far as diode measurements, they are of course missing voltage.

Clean board, old but clean PPBUS: 8.58V 3V42: 3.4V VRTC_G3H: 3.3V 5V_S5: 5V 3V3_S5: 3.3V 3V3_S5: 3.3V Checked all coils for shorts and nothing

Only C7226 was affected by corrosion and was not shorted. Diode measurements are fine, low resistance CPU lines were measured in ohms and were also fine. Forgot to mention PPBUS is 12.2V

Board had little corrosion at C7226 and cap fell off with a little push, check before removing cap and there was no short Restoring T2 gives error about giving up waiting to transition from DFU to DFU 3v3_G3H_RTC : 3.3V PP1V1_SLPS2R : 1.1V PP1V8_SLPS2R : 1.8V PP0V8_SLPS2R : 0.7V PP1V2_AWAKE ...

I2C_UPC_SCL and I2C_UPC_SDA diode reading are fine. Are I2C_SMC_UPC_SCL 0.8V and I2C_SMC_UPC_SDA 0.9 voltage should be 1.2V compared to good board are this lines bad? Just in case USB-C data works fine, just no charge. Battery currently has some charge and all else works fine...

After full charge OS now shows 100% health battery, thanks a lot!

I2C_UPC_SCL and I2C_UPC_SDA 1.8V

UPC_SMC_I2C_INT_L and UPC_SMC_I2C_INT_L diode mode good, both after connecting power are 0V while board is at 5V I2C_SMC_UPC_SCL 0.8V RD210 OK Diode read on par with good board. I2C_SMC_UPC_SDA 0.9V RD211 OK Diode read on par with good board. Both UF500 and UF400 were replaced and the result...

Clean board, when first came in one port had 20V and the other had 5V with battery connected, when checking the bad port PPVBUS_USBC0 had 0.5V when I as connected to the other port, after replacing UF400 that went away and now I have 20V on both ports but only with battery connected but 0A and...

Board now charges, but with new and original battery the Mac shows the battery condition as fair and with only 1% health, already did another DFU restore and the problem is the same.

No, PM_SLP_S4_L is no longer pulsing when I trigger SMC_ONOFF_L

Turns out now PM_SLP_S4_L is missing, I still get a pulse starts at 3.4V then drops to 0V on PM_PWRBTN_L when I trigger smc_onoff.

Q5155 was the problem, SYS_DETECT was 0.100 in diode mode and correct value is 0.480 battery was also bad.

No pulse board climbs up to 0.021A and stays there, U1950 reballed same thing.

Board was corroded around R5150, U6100 and U8160, all those chips were worked on and fixed, board worked fine for a few days and now it is back with PP5V_S4RS3 missing, diode mode here is correct. PPBUS 8.6V PP5V_S5 5V PP3V3_S5 3.3V PP3V3_SUS 3.3V When I Trigger SMC_ONOFF_L there is a drop...

Before replacing Q5265 CHGR_BGATE 3.5V PPVBAT_AON 12.1V PPVBAT_AON_CHGR_R 12.1V The above tells me all is good but I replaced it based in your recommendation Replaced it and same thing.

Clean board, no history. OS was reinstalled clean via DFU. Battery is recognized in OS but shows fair state and wont charge past 1% this is the original battery and it looks in good condition physically, exact same thing happens with new battery. Already replaced U5200 same thing, in this...