Dynabook Satellite Pro L50-G-1C2 - No boot / no charge

[nosfay]

Hi,
I've got a Dynabook Satellite Pro L50-G-1C2 that doesn't charge or power on.
Checked AC adapter first, it's good.
I've found some corrosion near a mosfet, and it's shorted from source to drain, identical mosfet close is shorted the same way.
I cannot find the datasheet or spare, reference is 6794 - GPOH11.
I need help to find what it is please

[mon2]

The insignia appears to be Alpha Omega from a distance.

AON6794.pdf (aosmd.com)

Jellybean mosfet. N-channel type. Can be replaced with many others from other donor boards that will have the BQ charger IC onboard so they too will be driving N-channel mosfets like this one.

[nosfay]

You're right, thank you !

[mcplslg123]

Are you sure the mosfets are shorted? They are likely to show very lows impedance in circuit as part og cpu/gpu rails. better to de solder the mosfets and then test them out of circuit. Verly likely not shorted.

[nosfay]

Indeed, both are good out of board. I've found one component close to them that heat a lot when AC charger is plugged.



I can't read the reference, it's something like APBM 861.

[mon2]

MPS # NB680AGD

(from the above sticky thread on IC part markings = APB*)

monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/NB680/document_id/4031/

(5piece)100% New NB680AGD-Z NB680AGD NB680A (APBF APBE APBG APB*) QFN-12 NB680 NB680GD NB680GD-Z ALV.. - AliExpress 502

Parts Markings thread:

IC Marking Codes and Datasheets - Badcaps

[nosfay]

Thank you