若Windows筆記本鍵盤燈不工作，可嘗試以下步驟排查：1.檢查鍵盤背光快捷鍵，使用Fn鍵對應(yīng)功能鍵調(diào)節(jié)亮度；2.確認(rèn)系統(tǒng)設(shè)置中未禁用背光，搜索品牌“鍵盤背光設(shè)置”進(jìn)行調(diào)整；3.檢查電源設(shè)置及電池電量，插電測試並查看節(jié)能設(shè)置；4.更新或重裝鍵盤驅(qū)動及廠商軟件；5.若均無效，可能存在硬件問題，可嘗試啟動其他系統(tǒng)確認(rèn)或聯(lián)繫維修。

If your Windows laptop's keyboard light isn't working, it can be frustrating—especially if you use it in low-light environments. The issue could be hardware-related, but more often than not, it's something you can troubleshoot without needing a repair. Let's go over the most common causes and what you can do about them.

1. Check the Keyboard Backlight Shortcut Keys

Most laptops use a function key (like F3, F5, or F9) combined with the Fn key to control the keyboard backlight. Sometimes these keys can be easy to miss or accidentally toggled off.

• Look for a key with a small lightbulb or keyboard icon.
• Hold the Fn key and press the corresponding backlight key to increase or turn on the light.
• Some laptops have multiple levels—try cycling through brightness options.

If this doesn't work, try the next steps.

2. Make Sure the Backlight Isn't Disabled in Settings

Some Windows laptops come with built-in software or settings that control the keyboard light. These settings might have been changed without you realizing.

• Lenovo, Dell, HP, and ASUS all have their own keyboard lighting control panels.
• You can search in the Start menu for something like “keyboard light” or the brand name plus “settings.”
• In some cases, there's an option to turn the backlight off when on battery power—check that too.

If you're not sure where to look, typing your laptop brand “keyboard backlight settings” into a search engine usually leads to the right place.

3. Check Power Settings and Battery Level

Some laptops automatically turn off the keyboard light when the battery is low or when running on battery power to save energy.

• Plug the laptop in and wait a few seconds—does the light come back?
• Go to Control Panel > Power Options and check if there's a setting related to turning off devices when on battery.
• Some laptops only allow backlight use when plugged in, so test both scenarios.

Also, if your laptop has been asleep or in hibernation mode, sometimes the backlight doesn't wake up properly—try closing and reopening the lid or restarting.

4. Driver or Software Issues

If the hardware is fine, but the software isn't working right, the keyboard light might not respond.

• Open Device Manager and look under Keyboards or Mice and other pointing devices .
• See if there's an entry related to your keyboard or HID devices. Try updating or reinstalling the driver.
• Alternatively, reinstall the laptop's chipset or keyboard-specific software from the manufacturer's website.

This is a bit more technical, but often reinstalling the correct drivers can restore functionality.

5. Hardware Problems (Rare but Possible)

If none of the above works, it might be a hardware issue. This could include:

• A faulty backlight circuit
• Damaged keyboard from spills or drops
• Issues with the motherboard

In that case, you may need to contact customer support or a repair shop. Before assuming the worst, though, try booting into another OS (like a live Linux USB) to see if the light works there—it can help determine if the issue is software-related.

That's about it. Most of the time, the problem is a shortcut key or a setting buried in the system. If it's not one of those, checking drivers or power settings usually gets things working again.

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