820-3126 led 1 turns off all time

[lincev]

i have this problem with this imac, no water damage.

I changing Q8110 but nothing...

measurements:

SMC_PM_G2_EN = 3,3v


3V42_G3H= 2,75v

Rail 3V42G3H in R7911 C7911 R7910 and U7900 2,75v

i need help, thanks for all

 

[2informaticos]

Replace C7900 and check if R7900/01 have correct values.
Just for test, remove C7901.

 

[lincev]

Hi again, nice i change this and now i have 3,3v but led1 is off yet

 

[2informaticos]

First LED requires 3V3_S5.
12V_S5 is there, at least?

 

[lincev]

i have 5v in R7722 R7741 and C8110 ...something else is damaged

 

[2informaticos]

Are you sure?
May want to check again; 5V on 12V power rail, mmmhhh...