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Q7950 removed, no change. R7963 removed, now ALL_SYS is high and fans spin.

No obvious damage, good magsafe. Gets orange light, but ALL_SYS_PWRGD is stuck low and I don't quite understand how to follow back to see why. Power rails: PPDCIN_G3H: 20.85 PPBUS_G3H: 12.59 PP3V3_S5: 3.35 PP3V3_S4: 3.35 PP3V3_S3: 3.35 PP3V3_S0: 3.34 PP3V3_SUS: 3.35 PP5V_S5: 5.0 PP5V_S4: 5.0...

Correct. 0v for 12-15 seconds after adapter plug in. .898 to .900 for the rest of time.

Thanks PPVCC_S0_CPU : 0.899

Multiple liquid damage points. Near R8711 ssd 1v8 power was especially bad. Replaced and tested nearly everything in that section. Also found damage on cc805 and cc804 pins 1 pads were missing completely. Replaced and reattached with magnet wire. Nervous about that since it's CPU power...

dudipupan check this shiz out: https://boards.rossmanngroup.com/threads/820-00165-cpu-heats-up-draws-35a.60817/ I think we had basically the same issue after all power signals were good. Missing PLT_RESET_L so the PCH/CPU was in constant reset.

lol so i got impatient, and tomorrow's the day i'm supposed to tell the customer if it's fixable or not. reflowed the CPU at around 350c, with a lake of flux and full airflow. I paid attention to the CPU pcb mostly, kept away from the CPU die itself but did hit the pch die area after i felt...

My issues seem to mirror this person's: https://boards.rossmanngroup.com/threads/820-00165-powers-on-but-no-usb-activity-and-no-post.60774/#post-71615 Including the power off when I measure CPUVR_PGOOD_R. If I measure this between reboot cycles I can get a reading without it powering off.

PLT_RESET_L : 0 As an aside: Would it be OK to use my hot air station with a large nozzle or should I only use oven to reflow cpu?

Came in from another shop. Liquid damage was cleaned on U1950. Replaced chip, repaired 3.42 supply trace. U1950 seems good: 1. ALL_SYS_PWRGD: 3.3 2. CPUVR_PGOOD_R: 3.3 3. SYS_PWROK_R: 3.4 4. GND 5. PM_S0_PGOOD: 3.3 6. SMC_DELAYED : 3.4 7. PM_S0_PGOOD: 3.3 8. 3.4 present...

Thank you again 2. It was thankfully the PMIC. Had to reball a donor like 3 times because I've never been good at doing the real big chips, and it likes to fly off. I learned to control my airflow, change to a larger nozzle, and move my scope so i can blow straight down onto the chip...

PM_SLP_SUS_L shows .003 in diode mode. 10 ohms black on ground in resistance mode. U8200 removed = same. r1237 @ 100k out of circuit So PCH or PMIC? PMIC on the data lines that dead TVS diode was on.

It got better looks like. Am I wrong in not adding PP beforehand? Edit: when i reread this it looks like i'm being a jerk, i'm not. Maybe I measured at a different point before? Is .98 low enough to assert pm_slp_sus_l?

DCIN: 20V PPBUS/PPVBAT_G3H_CHGR_R: 12.6 3V3_G3H: 3.4 3V3_S4: 0 3V3_S5: 3.3 5V_S5: 5 5V_S4: 0 3V3_SUS: 3.3 1V2_S5_SMC_VDDC: 1.2 SMC_RST_L: 3.4 HPWR_EN_L: 3.38 1V_S5_PCH_BLAHBLAH: 1.0 TBA_VDDA/P: 5 PM_EN_P3V3_G3H: 5 SMC_BC_ACOK: 3.4 PLT_RST_L: 0 PM_SLP_S5_L: 0 PM_SLP_S4_L: 0 PM_SLP_SUS_L: 0.98...

Thanks, yes PPBUS is present at 12.60. I know that a 00281 and 00928 aren't compatible SMC wise, it was wishful thinking is all. I'll start going down the lines again to check I haven't lost anything else now.

HA! OK so SCL on J6951 (battery data cable) was low in diode mode. Replaced TVS diode D6950. Now it negotiates 20v at a normal speed, instead of taking 10 seconds or more. Board Takes .320 mA now according to ammeter. Same with a battery. I have one 00928 SMC if needed, don't suppose a 00281...

Yeah. I'm gonna try that actually. Thanks. It does actually take quite some time to get to 20v. Like 20 - 30 seconds, like it was a 2014 air going through 2 restarts before starting up

Yeah I saw your other thread where you found that. It's good unfortunately. :(

Did it again. Fresh 9239 from sealed package. Same exact result. :( Do these have SMC issues or BIOS issues? Would it be any use to remove the U7000 and provide diode measurements?

Diode mode, red on ground, PPBUS @ F7000 pin 2: .409 TBA_AUX_DET: 5.01v SMC_BC_ACOK 3.4v Removed Fuses, Plugged in adapter, C7050 .244v C7030/40: Both caps measure 110nf, after removing from board. Diode at REMOVED Fuses Pin 2: .398. Pin 1: .505