820-00239 No power

[iClub]

This mac has been repaired by another technician in the U9300 region.
The mac displays backlight on and then quickly powers off. Shows USB activity for a few seconds.
I replaced UB300, as it had oxidized components around it.



Voltage:
PP3V3_G3H 3,4V
PP5V_S0 starts with 5V and drops to 300mV
PPBUS 13,07V
PP3V3_S5 3,35V
PP3V3_SUS 3.35V for a few seconds.

 

[2informaticos]

Did you try SMC bypass mode?

 

[iClub]

It does not accept SMC bypass mode.

 

[2informaticos]

All USB ports have the same behavior now?
Still turns off with battery connected?
SSD voltages appear?