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820-3332 S0 State No boot
- Thread starter No-Clean
- Start date
Do you get ALL_SYS_PWRGD?
All the other voltages from power on sequence present?
All the other voltages from power on sequence present?
Start removing Q7950.
If ALL_SYS_PWRGD is still low, remove power good resistors one by one, until goes high.
Keep in place R7967.
If ALL_SYS_PWRGD is still low, remove power good resistors one by one, until goes high.
Keep in place R7967.
I just saw on this board ALL_SYS_PWRGD is pulled up to 3V3_S0, not to PM_SLP_S3_L, like in other models.
So, are you missing 3V3_S0_FET?
Post Q7812/30 voltages.
So, are you missing 3V3_S0_FET?
Post Q7812/30 voltages.
"3V3_S0_FET no present on schematics"
And what is the output of Q7830???
Do we really need to full write the freaky signal names from Apple always?
Do you have 3V at pin1 of R7967??
If yes, ALL_SYS_PWRGD must be high, if you removed ALL the other components from pin 2 (apart of R7967); check if resistor is good.
U7950 can also pull it down; check there for corrosion.
And what is the output of Q7830???
Do we really need to full write the freaky signal names from Apple always?
Do you have 3V at pin1 of R7967??
If yes, ALL_SYS_PWRGD must be high, if you removed ALL the other components from pin 2 (apart of R7967); check if resistor is good.
U7950 can also pull it down; check there for corrosion.
No-Clean
Member
I searched for it on schematics, it shows up when I search for 3V3_S0_FET but on boardview is PP3V3_S0 3.3v
R7967 pin 1 is 3.3v and 10k pin 2 is 0.021v
U7950 was clean under it but replaced it anyways
Removing ALL_SYS_PWRGD resistors one by one and checking each time same result keeping R7967 at all times, even with all but R7967 removed same thing.
I also replaced Q7950 and checked R2584 but all are OK
I reballed SMC again and same thing, could this be a bad SMC?
R7967 pin 1 is 3.3v and 10k pin 2 is 0.021v
U7950 was clean under it but replaced it anyways
Removing ALL_SYS_PWRGD resistors one by one and checking each time same result keeping R7967 at all times, even with all but R7967 removed same thing.
I also replaced Q7950 and checked R2584 but all are OK
I reballed SMC again and same thing, could this be a bad SMC?
Did you check it removing U7950?
Any liquid sign at J2550?
Also try removing R7974.
Keep Q7950 out of board.
Any liquid sign at J2550?
Also try removing R7974.
Keep Q7950 out of board.
Do you still have 3V at pin 1 of R7967?