No WiFi, weak bluetooth

Hey all,

I have a switch OLED,

Currently having issues where it sees other networks and not mine (factory reset router and switch) and also when putting joycons into wireless, it sometimes shows paired on screen but the joycons still flash.

Replaced both antennas and still suffering the same issue.

The WiFi code is 2110-2004.

I am now under the impression from reading various places the WiFi chip is toast, is there a way of diagnosing it with multimeter ? I see lots of posts for normal switch but nothing to the affect of OLED?

Thanks