hello,
i have mbp a1707 does not power on i get ppbus_g3h 20v okay and smc 3.4v okay.I have noticed there is a chip called Banjo PMIC has problems i do not get pp3v0_pmicldo=0volts
pp5v_pmicldo=0volts
pp3v3_pmicldo=0v
pp1v25_pmicvref=1.25volts
the chip SN650839 i have changed but still same problem. are there any inputs to turn the LDO 3v and 5v on.
thanks

okay so i fixed this one changed the sn650839 also the pmic ref cap c7834 to get 1.26v ref and for pp5v_pmicldo 10uf c7836 needs to be changed and c7833 pp3v_pmicldo changed all this now my machine works .But a new problem everytime it tell me that a critical update needs and when connect to wifi it goes in loop. and noticed the Touchbar does not work nor the keyboard backlight. the machine works in safe mode but limited services .
I have formatted the ssd with catalina and bigsur same problem.
anyone faced this critical error as it is on the internet for touchbar but no real solution.
thanks again

ohh just for info sn650839= TPS650830 the data is online TI

Инфа неверная. У sn650839 VR3=0,95v. У tps650830 VR3=3,3v.