You would need some kind of chip specific diagnostic program to verify functions. The manufacturer, Marvell, probably has one but it may not be available to the public... I don't see it anywhere. Specific chip from the teardown: Marvell 88W8897 WLAN + BT4.0 + NFC Combo Chip (with no NFC support on the device)Actually when I say similar behavior it may be exaggerated a bit. LAN just takes quite a while to connect. Usually after it boots or wakes up I see the limited connectivity icon and it stays there for half a minute or so.
Is there a way to check if the WiFi chip is OK? Is bluetooth also handled by the same chip, for instance?