820-3435

[Mac Tech]

Hi everyone.

I have seen this fault before in models 820-00165.

The problem is the following, I don't have ALL_SYS_PWRGD, when removing u1950 the machine turns on but obviously not completely because PM_PCH_SYS_PWROK is missing.

My question is, how do I attack this bug? Would I have to change all the ICS involved in the ALL_SYS_PWRG line since some may be blocking the ignition?

 

[2informaticos]

ALL_SYS_PWRGD comes high when U1950 is removed?
Put it back and test again removing Q8150.

 

[Mac Tech]

Yes, when removing U1950 the ALL_SYS_PWRGD voltage is 3.3 normal.

What would change by removing Q8150?

I replaced U1950 and it's working normal, I'll have it tested.