設(shè)備連接Wi-Fi問題通常由設(shè)置或兼容性導(dǎo)致，非網(wǎng)絡(luò)故障。 1. 先確認(rèn)是否為設(shè)備問題，嘗試重啟設(shè)備、忘記網(wǎng)絡(luò)後重連；2. 測試多類設(shè)備，判斷是否僅某一類無法連接；3. 檢查Wi-Fi頻段（2.4 GHz與5 GHz），部分舊設(shè)備不支持5 GHz，可嘗試分離SSID；4. 更新路由器固件，檢查安全協(xié)議及MAC地址過濾設(shè)置；5. 考慮信號強(qiáng)度與乾擾，5 GHz穿牆能力弱，避免障礙物或改用Mesh系統(tǒng)覆蓋更大區(qū)域。

Your Wi-Fi working on some devices but not others usually comes down to a few common reasons — and most of the time, it's something you can fix without calling your ISP.

Check if It's a Device-Specific Issue

First off, make sure the problem is really with the Wi-Fi and not just the device itself. Try turning the device off and on again, or forgetting the network and reconnecting. Sometimes devices just get stuck in a weird state.

Also, test different types of devices — like a phone, laptop, and smart TV — to see if only one category (like just laptops) has issues. If only one device doesn't work anywhere, it might be hardware-related. But if it works on other networks and not yours, then it's probably your router or settings.

• Restart both the device and the router
• Forget the network and reconnect
• Test across multiple devices

Look at the Wi-Fi Band: 2.4 GHz vs 5 GHz

Many modern routers broadcast two Wi-Fi bands — 2.4 GHz and 5 GHz. Some older devices don't support 5 GHz at all, so they'll either not see it or won't connect properly. On the flip side, newer phones or laptops may default to the faster 5 GHz band and avoid the slower 2.4 GHz unless signal strength drops.

If your router uses the same network name (SSID) for both bands, some devices might struggle to pick the right one. That can lead to spotty connections or no connection at all.

• Older devices often only support 2.4 GHz
• Some devices may fail to switch bands automatically
• Try separating your SSIDs for each band to troubleshoot

Router Settings or Compatibility Issues

Sometimes, the issue is more technical — like outdated firmware on your router or incompatible security settings. For example, if you recently updated your router's settings to use WPA3 encryption, some older devices might not support that yet and will keep failing to connect.

Also, check for MAC address filtering — a setting that lets you block specific devices from connecting. You might have turned this on by accident or added a rule that's now blocking something unintentionally.

• Make sure your router firmware is up to date
• Check if security protocols match what your device supports
• Double-check MAC filtering rules

Signal Strength and Interference

Even if your devices are compatible, physical factors matter too. Thick walls, metal objects, and even microwaves can interfere with Wi-Fi signals — especially on the 5 GHz band, which has shorter range and worse wall penetration.

Try moving the device closer to the router or changing the router's location slightly. Also, avoid placing it near large appliances or mirrors. If you're covering a big area, consider a mesh system instead of a single router.

• Distance and obstacles affect signal quality
• 5 GHz has less range than 2.4 GHz
• Mesh systems help cover larger areas reliably

基本上就這些。多數(shù)時候是設(shè)置或compatibility 的問題，不是網(wǎng)絡(luò)本身壞了。試試上面這些方法，應(yīng)該能解決大部分情況。

以上是為什麼我的wifi在某些設(shè)備上工作，而其他設(shè)備不起作用的詳細(xì)內(nèi)容。更多資訊請關(guān)注PHP中文網(wǎng)其他相關(guān)文章！