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refixed u 1950 and removed r1962 fan spins all voltages ok u1950 3rd leg 3v3 but no display I assumes when u 1950 outs PM_PCH_SYS_PWROK system not getting on is it may be the issue of smc or pch

with out u1950 voltages at its pin are 1 leg 3v3 2 leg 3v3 3rd leg 0 5th leg 0.9v 6th leg 3v3 7th 0.9v 8th 3v42

removed u1950 system power on all voltages came fan spins but no chime no display (without u1950) changed bios but same

820-00165-a dead 3v42 g3h ok pubus g3h ok 3v3 s5 ok all voltages switching for a second including v core and allsyspwrgd when connecting charger (with out battery) but no fan spin

not original -tried with 87w copy adapter

820-00281-A board came in dead condition. when disconnected battery and plugged adapter fan spin and shows a battery symbol then off. PPBUS G3H =12.5 volt PP3V3 S5 = 3.3 5V S4 = 5 /PPVCC CPU =0.6Vwhen powering up

I ordered charging ic, but till not get Waiting. 😐

plz explain normal lap power on sequences (w/o T2) ? . i didn't find the forum for thes boards plz share links

K

is the lap performance reduce without battery?

Is power sequence the same before and aftr T2 macbook was introduced plz explain both,

Q7040'S 5,6,7 legs are GND and 2,3,4 are PPVBAT_G3H_CHGR_REG its totally shorted so PPVBAT_G3H_CHGR_REG was shorted to ground before changing Q7040 after replacing Q7040 , F7000 gets high resistance to ground. I changed both Q7040 and Q7030 with same (AON7934) but still only 1volt at F7000.

U7000 voltages; PP DCIN_G3H_CHGR = 5 VOLT AUX_DET = 1.1VOLT VDDA/P = 5VOLT CHGR_RST_IN=0 VOLT SMC_RST# NOT FOUND AUX_OK NOT FOUND A/BMON= 0VOLT PP3V3_G3H_RTC = 0VOLT

SMC bypass mode?

yes F7140/41 good fuse L7130 pin 2 volt-12.60v ( PPBUS_G3H ) U7100 pin 17/18 -3.4ohms pin 27/28 -21.6ohms

First of all sorry. No Q7040 no other legs shorted to ground It's internally shorted. The short cleared by replacing q7040 PPBUS_G3H has high resistance arround 1300, it goes high ohm in diode mode

With battery,irrespective of adpter, machine is restarting in loop, the machine works fine on adapter without battery ( no restarting issue) PPBUS_G3H 12.40v Q7155 after changing same condition

BOARD DEAD Q7040 SHORTED TO GROUND I CHANGED WITH AON7934 (Q7040 WAS SiZ342DT) BOTH DUAL N CHANNEL SHORT CLEARED. NOW AM GETTING ONLY 1.3VOLT AT FUSE F7000. WHAT MAY BE THE ISSUE IS BAD CHARGING IC OR WRONG MOSFET ? PLEASE HELP

properly working w/o battery i changed bios,charging ic (U7100) & new battery but found same issue i attached Machine-check-capabilities

K