Macbook A1398 820-00136

[Instafixx]

Device was working but suddenly went off.
PPBUS at 12.56V.
No Fan Spin.
PM_SLP_S4_L and PP5V_S3 missing.

 

[2informaticos]

Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L (at same time).

Did you try SMC bypass?

 

[Instafixx]

No drop in pulse when SMC_ONOFF_L is triggered.

 

[2informaticos]

If PM_PWRBTN_L stays high, the problem may be SMC related.

SMC_ONOFF_L stays high normally?
Did you test the board alone on the desk?
What about SMC bypass?

 

[Instafixx]

Yes board alone on desk.
SMC bypass didnt work.

SMC_ONOFF_L stays high.

 

[2informaticos]

3V3_S5/SUS come high?

 

[Instafixx]

3V3_S5 is present.
I got a fan spin for about 5 seconds. during that time SUS was present. Then it dropped to 0V

 

[2informaticos]

Got fan spin in normal mode, or SMC bypass?

 

[Instafixx]

Normal Mode. I did get it yesterday as well for a few seconds. As if the machine is trying to turn on.

 

[Instafixx]

Please reply.

 

[2informaticos]

When tries to turn on, PCH and CPU voltages come on?
What about ALL_SYS_PWRGD?

 

[Instafixx]

Yes at that moment all voltages appear. very briefly

 

[2informaticos]

Check voltage pulse and diode mode for page 69 outputs.
Also check page 23.