A2991 820-02917 corrosion around UN480 2.5 NAND lines. 0.6ohm Dead nand?

[it-solve]

I am following A2485 820-02100 schematic as I can't find this one.

UN480 is a different layout on A2485 LT8642-2 while this layout on A2991 is LT8642-1




GND - 0.23ohm - for reference
VIN - PPBUS_NAND0 - 0.70ohm
P2V5_NAND0_SW - 0.61ohm

If I lift up LN480, I get 0.6ohm on the PP2V5_NAND0 side, while the P2V5_NAND0_SW side stays at above 300ohm

Would this mean dead nands? Any point to continue?

i still have short at around U5200 too I havent checked yet

 

[2informaticos]

You can inject voltage into 2V5 side, to confirm.
But is very likely dead NAND...

 

[it-solve]

These Nands seems to be able to sink 2V 3A happily

Top nand seem to heat up. Dead nand seems like

If no short after the top one comes out, can an individual nand be replaced (if I can source same board/model nands)? Then DFU restored or all needs to be paired?

 

[2informaticos]

I don't expect any NAND survived there...