820-01521-a not booting

[BCN_Techs]

Usb get 19V and goes up to 1.27Amps.

Board getting warm near U3900 area. No USB activity, no image external internal, caps button not turning on so my guess board is not entering S0


SMC LID 1.6V


Any common issue with that f----ing T2 boards?

There was liquid damage on sound board, after that customer connected it, touch id button got hot and computer shut down. Nothing mor, board seems be clean enough.



Some rails:


PPBUS 12.94V
PP5V_G3S - 5.1V
PP5V_S5_LDO 5V
PP3V3_G3S 3.3V
PP3V3_G3H_RTC 3.3V



On USB entrance AMPS are going up and down like board is working.

 

[ZAKLINTOWN]

Are you attempting to start machine with Audio board connected? Do you get a fan spin?

 

[BCN_Techs]

I have tried with and without audio board. Same result

 

[2informaticos]

If you talk about J6100, many lines go to T2; it is probably damaged now...

 

[BCN_Techs]

So it must be reprogrammed or board is dead?

P.S. will confirm tomorrow if j6100

 

[2informaticos]

More likely physically damage.

BTW, the LID signals are pulled-up to 1.8V, so 1.6V looks like good value.

 

[BCN_Techs]

Anything to do with t2?

 

[2informaticos]

U3900 is T2.
You've noted it overheating?

Nothing to do, if T2 is damaged...

 

[BCN_Techs]

I can confirm that we are talking about J6100. Also can confirm that T2 is getting warm-hot


does warm means is it ok=?



is there any way to retrieve data fromt that mac?

 

[2informaticos]

There is no lifeboat connector.
You cannot directly access SSD untill board boots.
Ask the client if TimeMachine was enabled.

I don't think T2 should get very hot.
In your case is sign of death probably.
Better to compare with working board.

 

[BCN_Techs]

may be getting hot wasnt exact description. It is getting warm.


What can i check to be sure if it is or not T2?

 

[2informaticos]

Check diode mode readings on the lines between T2 and J6100.
Better to have working board for comparison.