Hardware Nintendo Switch Left Joy-Con IC Question

[CapTec]

So a switch I've been working on that's given me an immense amount of grief is almost entirely functional save for one final fault I need to repair.

The left Joy-Con will not pair when slotted into the switch in hand-held mode. The switch just doesn't detect it.

I'm not entirely sure which IC's and MOSFETS are responsible for the left Joy-Con rail. It's not the connector or the rail itself as I took a known working Joy-Con rail and I've gone as far as to replace the Joy-Con socket connector on the switch board.

Could anyone point me in the right direction as to which IC's/MOSFETs are responsible for the Joy-Con connector? It's the one next to the battery power socket.

I've replaced the components I've highlighted and that hasn't made any difference at all, so I'm thinking it's not these IC's at the very least

 

[CapTec]

I resolved this in the end. It turns out the known good Joy-Con rail had actually gone bad. Go figure... Heh. Anyways I sorted it in the end.