Dell Alienware X17 R1 - Power Rail Failure

[hobostove]

I have a Dell gaming laptop here with a blink code of 3 red, 5 blue (power rail failure). 3V and 5V are present, but 1.8V is missing. I looked at PU1801 according to the schematic, and it's not receiving an enable signal. Any ideas where to check next? I think that signal comes from the PCH.

No obvious shorts under thermal (or probed), damaged components, liquid, etc.

Board: LA-K472P

Link to post with schematic

[mcplslg123]

1.8V will come up in S0 stage as per schematic. Refer to pg3 of schematic and see all the rails listed in power plane.
Only 3V/5V/1.0V should be present in standby on adapter.

[hobostove]

I wasn't able to find +1VALW or +1V_PRIM anywhere else on the schematic. I found where 1.05V is generated, is that the 1V that should be on? I checked the IC that generates 1.05V and no enable signal there.