(SOLVED)820-00431-a 1led green no power no fan spin

[lincev]

hi all, I have this board, connect power led1 green, pulse power button anything...

PM_PWRBTN_L=3.38v pulse SMC_ONOFF_L down to 0.10v
PM_SLP_S4_L=3.28v pulse power button same voltage no change
PM_SLP_S3_L=3.28v


SMCBAD ? thanks for all

 

[2informaticos]

Any history available?
Do you get pulse on CPU core too?

 

[lincev]

history all right until last week it turned off and did not turn back on.

u speak about PLT_RESET_L? PLT_RESET_L=0v with/out pulse

 

[2informaticos]

No, I meant L7110/30/50.
You've said to get pulse on PM_SLP_S3_L, so many coils should pulse.

Check what happens in SMC bypass.

 

[lincev]

nice I don't have pulse but I have short to ground

resistance L7110 REG_PHASE_CPUVCC1=2.5ohms scale 200

 

[2informaticos]

I doubt to be short.
You should compare with similar board.
Powerful CPUs have low resistance as normal.

 

[lincev]

I don't have another 2015 board, can we go another way?

I've seen no voltage at any time in L7110/30/50

Is it true that the coil resistance is normal 01.0 and they seem to be good

So I don't understand why there is continuity to ground

On L7100 I have voltage 1.9v increasing very slowly

 

[2informaticos]

"Powerful CPUs have low resistance as normal"
I meant resistance to ground!

Any other coils pulsing in rithm with PM_SLP_S3_L?

Just in case, change Q8450.

 

[lincev]

niceeeee !!! thanks thanks ! solved ! the problem is Q8450

I was able to get this IC from a MBP 2011 and everything was solved


thanks for all !!