820-00034-A 2 led on, fan on, no chime/screen

[2informaticos]

Should come back to 3V, when you release power button.
SMC_ONOFF_L comes back to 3V?

 

[yair37]

Should come back to 3V, when you release power button.

i know..

SMC_ONOFF_L comes back to 3V?

yes its back to 3.3v

PM_PWRBTN_L back to 3.3v just after i take out the power supply and plug it again.

 

[2informaticos]

Looks like SMC problem.
Of course, be sure 3V42_G3H, 12V_S5 and 3V3_S5 don't drop when press poower button.

 

[yair37]

3V42_G3H, 12V_S5 and 3V3_S5 stable..
replace SMC?

 

[yair37]

I was replaced the SMC but now PM_PWRBTN_L is 3.4v stable even when i trigger SMC_ONOFF_L

 

[2informaticos]

Bad solders maybe; or bad SMC replacement.

 

[yair37]

i was replace twice, still PM_PWRBTN_L is 3.4v stable even when i trigger SMC_ONOFF_L, must be SMC?

 

[2informaticos]

PM_PWRBTN_L is controlled by SMC.
However, sometime PCH can block SMC to work correctly.

 

[yair37]

o.k i was replace it again.. PM_PWRBTN_L is 3.4v sown to 0v and then up to 3.4v when i trigger SMC_ONOFF_L .
still no LED #2

 

[2informaticos]

Now check for pulse at PM_SLP_S4_L at same time.