Wifi is not connecting. Can you fix it?
My Nintendo can't connect to Wifi.
I think it has to be replaced new LAN card, can you fix it?
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The wireless controller is built into the motherboard so there's no such thing as a LAN card that can be replaced. I'd look for software solutions first, but as a last resort there are WiFi and Bluetooth antennas that could be replaced, but it's not all that common for them to fail unless they get damaged somehow.
Nintendo Switch Bluetooth Antenna Replacement - iFixit Repair Guide
Nintendo Switch WiFi Antenna Replacement - iFixit Repair Guide
I would definitely save these as a last resort, as they're not easy to replace, especially the Bluetooth antenna.
P.S., iFixit does not do repairs; they provide tools, parts and advice to enable you to do your own repairs.
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Nintendo Switch WiFi Antenna Replacement
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1 hour
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Nintendo Switch Bluetooth Antenna Replacement
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2 hours
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