A1466 820-00165 0.11A and not turning on after a dead fly over P1V05S0_FB

[it-solve]

Got corrosion on R7611/12. Replaced them and now stuck on 0.11A. No other corrosion on the board. No damaged traces between R7611/2 and P1V05S0_FB
3.3/5V are present.

PP1V05_S0 - 1.04V
PPDDR_S3_REG_L - 1.20V
PP3V3_S5_REG_L - 3.20V

I managed to fire it up with SMC bypass before, but now is not even initiating. Any advice?

 

[2informaticos]

Check U1950 voltages.
CPU core gets any voltage?

 

[it-solve]

No core voltage on CPU core

U1950
PP3V3_S0 - 3.31V
ALL_SYS_PWRDGD - 0.1V
CPUVR_PGOOD_R - 3.32V
SYS_PWROK_R - 0V
PM_PCH_PWR_PWROK - 0.1V
PM_S0_PGOOD - 0V
PP3V42_G3H - 3.43V

 

[2informaticos]

Do you still have 1V at L7630?
If yes, check L7430, L7820 and all voltages from page 58 too.

Remove Q8150 and check ALL_SYS_PWRGD again.

 

[it-solve]

L7630 - 1V, only coils I dont have voltage are CPU core
L7430 - 1.21
L7820 - 1.8V

PP1V5_S0 - 1.5V
PP3V3_S0 - 3.32V
PP3V3_S4 - 3.31V
PP3V3_S3 - 3.32V
PP3V3_S5 - 3.32V
PP3V3_SUS - 3.33V

PP5V_S0 - 5.09V
PP1V05_S0 - 1.06V


Removed U8150 and turns on ALL_SYS_PWRGD - 3.33V

 

[2informaticos]

Still no voltage on CPU coils (without Q8150)?
Post U1950 voltages then.

 

[it-solve]

got it running without u8150, remembered you mentioning that we don't need it. shall i leave it off?

Can load up now and everything seems to work ok on external drive, apart from not detecting the SSD. Tried with 2 spares and none are detected. I can load via USB and seems stable

Did PRAM reset

PP3V3_S0SW_SSD_FET_R - 3.3V
SSD_PWR_EN - 3.2V

 

[2informaticos]

Q8150 is a redundant protection.
If the 3 power rails supervised by it are good, no need to resolder it.

Post U3740 voltages.
Check all pads of SSD connector and its traces.

 

[it-solve]

U3740
P3V3SSD_VMON - 0.99V
SSD_RESET_L - 3.28V
SSD_RESET_CONN_L - 3.42V
SSD_PWR_EN - 3,23V

Cleaned the pads, and tried with spare SSD

 

[2informaticos]

SSD is not detected at all in Disk Utility?

Inspect all traces and components related with J3700.

 

[it-solve]

Not Detected at all, tried another bunch of SSD and getting ? mark. Not even one deteced under Disk Utility or System Report

Cleaned the traces and rechecked for any damaged/corroded components around. None

 

[2informaticos]

Try changing U3710/11.
Compare J3700's voltages/signals with good board.