820-2530 no PM_SLP_S3_L

[XooP]

Got one more of these old 820-2530 boards. I have all main power rails and I have PM_SLP_S4_L. When pressing power I only get 0,78V on PM_SLP_S3_L should be 3.3 I think.

There is no short to ground and all the enable resistors and capacitors on this line is fine.

Is this bad SMC?

 

[dukefawks]

Voltage on C7771?

 

[XooP]

I get 1.057 here

 

[dukefawks]

That is ok. Voltage before and after R7859?

 

[XooP]

Both sides the same 0.106, which is what I get everywhere i measure PM_SLP_S3_L when i press the power button. It raised from 0 to 0.1V when button is pressed. One more thing i wrote the wrong value i the first post it should be 0.078-0.1V.

 

[dukefawks]

Are you using a 85W charger? SMC_ADAPTER_EN high?

 

[XooP]

Yes, a genuine Apple 85W charger, SMC_ADAPTER_EN =3.39V

 

[JorgePayar]

Yes, a genuine Apple 85W charger, SMC_ADAPTER_EN =3.39V

Im writing from a mac with that board right now, and it uses a 60W charger.

 

[XooP]

Shouldn't matter if the charger can handle more than 60W. If I was using a 45W charger, then it could be an issue.

 

[JorgePayar]

Ok it´s good to know

 

[dukefawks]

No! 15" board will NOT power on from anything else than an 85W charger!

I have no more ideas about this one really, any history on this board, water?

 

[XooP]

You know this is a 13 inch board? And yes it was as originally water damaged

 

[XooP]

Well, I'll try to reflow the SMC before it goes into the donor bin