820-5509

[thomamagic]

hello
please need help for 820-5509
i have fan start 1 sec and stop directly
After 30 second same but never boot
i have flash bios same problem
i have 3.3V in big coil
Thanks for you help

 

[thomamagic]

with power lab, i have put 12V / 7A and same problem, start 0.165A and stop
i have 2 times up to 0.350A but 1 sec and stop
(for information)
i have check CPU/GPU it's clean, not hot

 

[2informaticos]

When fan spins, 5V_S0 is present.
Do you get voltage on other coils (at same time)?

Did you try SMC bypass?

 

[thomamagic]

Check other coil no voltage
5V_S0 you know where is it because don't have boardview on this
Don't have check SMC Bypass i can check monday

 

[2informaticos]

My error, the fan is powered from 12V_S0.
However, that means S0 rails get enable signal; probably just pulse.
So you should detect pulsing more coils.

 

[thomamagic]

i have pulse 0.4V when fan turn and stop on the coil near the 3V
check for SMC BYPASS same problem
on other big coil, i have pulse too but very slow (beetween 0.05V and 0.2V)

 

[2informaticos]

When testing in SMC bypass, you should get higher pulse, more easy to detect.

Check diode mode to ground on all coils; compare with good board, if possible.
Also check at USB power rail.