Laptop Screen Is Almost Completely Dark Even at Maximum Brightness
Asked by
MellowCedar42
My Lenovo IdeaPad C340's display has become so dim that I need to shine my phone's flashlight on it to read anything. I can still faintly see the picture, and I know where the brightness control is, but changing it—even setting it to maximum—does nothing. What should I test to determine whether this is a software issue, a bad cable, or a failed backlight?
Answers
If you cannot use the built-in screen, an HDMI monitor or TV can serve as a temporary solution. Most laptops will send the picture to it automatically after startup, or you can use the display-switch keyboard shortcut. A portable HDMI monitor is another option, but repairing the laptop may be cheaper depending on the diagnosis.
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Since the image is still visible when you shine a light on it, the LCD is probably producing an image but its LED backlight is not working. A loose display cable is possible, but a failed backlight or panel is more likely. The laptop may need a panel replacement, and it is worth having a shop check it before attempting the repair yourself.
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Check whether the screen is equally dim inside the BIOS. If it is dark there too, the problem is almost certainly hardware, such as a failed backlight, display cable, or panel. If the BIOS looks normal, try Safe Mode or reinstalling the graphics and display drivers, since the operating system may be causing it.
CopperLynx27: A replacement panel or backlight can vary a lot in price. Before buying anything, try connecting an external monitor or television if you can, and get a repair-shop estimate. Replacing the panel yourself can be difficult without the right tools.
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SilverOtter39: I would avoid taking it apart unless you are comfortable working with small connectors and laptop hinges. A technician can usually tell whether it is the cable or panel fairly quickly.