Start with the simplest possible cause before touching anything more involved. Smart TVs load channels from a playlist URL or a set of server, username, and password fields, and a single wrong character in that address stops every channel from loading at once, not just some of them selectively. Re-enter the details exactly as given by your provider, checking carefully for a stray space the on-screen keyboard sometimes adds. If the same login loads channels fine on a phone or another device on the same network, the playlist itself is fine and the fault sits specifically in the smart TV app's saved entry.

Samsung and LG smart TVs run their own operating systems, separate from Android TV or a dedicated streaming box, and their native apps generally have less memory headroom to work with as a result of running on that lighter system. A channel list that loads fine on a Firestick or an Android TV box can stall specifically on a smart TV's built-in app, showing loading spinners or partial lists where the other device shows the full lineup cleanly. Hiding channel groups you do not use reduces the memory load the app has to carry and is a real, device-specific fix on smart TVs, not a generic tip copied from troubleshooting for other hardware.

Smart TV apps cache the channel list locally so they open faster the next time you turn on the app, instead of pulling the full list fresh over the network every single time. When the provider updates its lineup, adding or moving channels, that local cache can hold outdated entries that fail to load correctly even though the live list on the server is completely fine. Clear the app's cache from the TV's own settings menu, not the app itself, which resets the stored list on next launch without touching your saved login or requiring you to re-enter anything.

If the same login loads fine on a phone using the same Wi-Fi network but fails specifically on the smart TV, the fault narrows down to that TV's own network connection, not your whole home network or your router in general. A wired ethernet connection instead of Wi-Fi, where the TV has a port for one, removes signal strength and interference as variables entirely for that one device. If channels fail on every device connected to the network, phone included, the fault has moved from the TV specifically to the shared network path itself, and no TV-side setting will fix that.