HP Pavilion x360 Brittle MB 15256-1 0.7V on RAM

[REpairAT]

Hi,
notebook was water damaged, powercycled all two seconds.
Found oxidation around RT8231AGQW IC, desoldered, cleaned, all pads are fine (on board and IC). found resistor on Pin 9 (TON) open, replaced it with 500k, now notebook stays on but delivers only 0.7V on RAM.
How to properly check if the chip itself is fine or cause of the issue? Couldn't find any schematic either.

Thanks a lot!
BR, Ray

[mon2]

Re: HP Pavilion x360 Brittle MB 15256-1 0.7V on RAM

Study the other HP logic boards that use the 'B' (without tracking support) version of the same component.

[REpairAT]

Re: HP Pavilion x360 Brittle MB 15256-1 0.7V on RAM

"PR222" 243k on Pin 13 (CS) measures 434k on my board, rest seems normal.

[mon2]

Re: HP Pavilion x360 Brittle MB 15256-1 0.7V on RAM

Pin 13 defines the current limit which may be fine and is by design of this logic board.

Is the RAM soldered on this board or removable?

[REpairAT]

Re: HP Pavilion x360 Brittle MB 15256-1 0.7V on RAM

Is the RAM soldered on this board or removable?

Removable. With RAM, static 0.7V
Without, notebook powercycles few times with a peak of around 2.6V on on RAM slot. As soon as it stays on, 0V.

[mon2]

Re: HP Pavilion x360 Brittle MB 15256-1 0.7V on RAM

Is the RAM the original and compatible module for this unit?

The output voltage for the RAM sounds high but not sure so wait on additional feedback.

Consider to replace this component and test without any ram after the component has been replaced.

[REpairAT]

Re: HP Pavilion x360 Brittle MB 15256-1 0.7V on RAM

Is the RAM the original and compatible module for this unit?

Thanks!
Yes, RAM is original and known good, also doesn't work with two other same spec modules.