Thunderbolt DSL6540 missing 0.9V at Zbook G3 15

[EdwardGeo]

Hi! I have a Zbook G3 15 and thunderbolt isn't working.
This laptop doesn't have any schematics, so the only one I have found is for DA0X31MBAF0 with same chip.

The image attached shows that voltage comes from thundebolt IC VCC0V9_SVR and after a coil this transfers to TBT_SVR_IND.

What this voltage is responsible for? Also, there is no short on coil. When the laptop starts, 0.9v appears but only for a second, and then it goes off. Maybe inject 0.85 volts to that coil to test if that is protection or that is normal if this voltage is missing?

[EdwardGeo]

Re: Thunderbolt DSL6540 missing 0.9V at Zbook G3 15

NOTES:

TBT_FORCE_PWR (158) - connected to CPU
TBT_CIO_PLUG_EVENT (305) - connected to CPU
BATLOW (136) - connected to CPU
MAINON (102) - throuht resistor

[EdwardGeo]

Re: Thunderbolt DSL6540 missing 0.9V at Zbook G3 15

After DSL6540 was replaced, all voltages are okay