A1369 820-2838-A no power

[hgoncalves]

Hi,

I have an A1369 820-2838-A that has no power. I have green light, but no fan spin.
The first voltage that i missed in the power rails are:

PP3V3_S3 = 0V
PP5V_S3 = 0V

Couldn't figure iut where they are created to follow the trace. Can you help?

 

[2informaticos]

This board will not turn on without pressing power button.
Do you get L7750 voltage?

 

[hgoncalves]

Hi,

Yes, I have 0.907V

 

[2informaticos]

This schematic has the power on sequence on page 3.
Did you check PM_PWRBTN_L reaction?

 

[hgoncalves]

tks for the tip on the power on sequence page.
PM_PWRBTN_L gets low when SMC_ONOFF_L gets pressed and i have fan spin. It seams that the problem is the power buttun.

TKS!.