Repair HP ENVY Laptop 17-cg1008ca Motherboard GPT70 LA-J504P

[neoOpus]

Hi,

I am looking for the schematic of this HP ENVY Laptop 17-cg1008ca Motherboard GPT70 LA-J504P or this component, PQB4 reference (Unable to read the text beyond P5)

I also want to replace these two other parts on the same board, one labelled 43t (if I am not reading it wrong) and another resistor labelled 2R0.

Furthermore, if someone with experience could tell me, why would this component burn in order to avoid this happening again?

And I have a question about modding this mobo in order to have more VRAM, right now, it has two of this chip
Model: H5GC8H24AJR-R2C Brand: Hynix Series:GDDR5 Capacity:8Gb Voltage:1.5V

Which equivalent to 2 GBytes and I want to replace them to get 4 GBytes (to make some AI models work on it).

Thank you.

[m k]

Burning 43t and 2R0 is most likely overcurrent.
Three legs of 43t connected, so maybe a source.

Maybe two different voltages through those two equal resistors.

9538 seems to be a battery charger.

[perieanuo]

intersil datasheet may help if you don't get the mobo schematics

[fzabkar]

https://au.mouser.com/datasheet/2/698/REN_isl9538b_SDS_20180302-1999784.pdf (ISL9538BH)

https://assets.nexperia.com/documents/data-sheet/BAT54CW.pdf (43t = BAT54CW)

8N = PNP digital transistor?

P5 = NPN digital transistor?