Wi-Fi issues in smart TVs split into: router, settings, or TV Wi-Fi module. Diagnosis starts from simplest.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing Wi-Fi not connecting — ranked from most to least common.
Router too far or weak signal
Wrong Wi-Fi password or changed
Router on 5GHz only, TV is old (2.4GHz only)
Bad Wi-Fi module in main board
OS update needed
MAC address filter in router
IP address conflict
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.