Laptops Notebooks
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fn and F7
External works fine
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If it is an LED then there is no inverter as there is no backlight. Â If it is an LCD it might be the inverter but I've seen it more often where it is the backlight itself that has gone bad.
You can try replacing the inverter, but in all likelyhood you will need to replace the screen.
You then need to weigh the options if spending the time and money for a new screen is worth it.
In the meantime you can hook an external monitor up and at least be able to use the laptop.
You will have to use some combination of FN keys to cycle through the dispalys until the image shows up on the external monitor.
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If so, then you may be looking at the ambient sensor going bad or perhaps the brightness settings are set for 'auto' - i have seen the 'Auto' setting do this. Take it off 'auto brightness' and crank the brightness up to see if you can adjust it. If you can indeed adjust it then the inverter or backlight is not the culprit. It could just be a power save setting.
but they do have a backlight, but it does not use an high voltage, so - no inverter
in some cases, there is a fuse on the mobo, check that first : Â http://nwapchelp.hubpages.com/hub/Lenovo-Dim-LED-Backlight
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Laptops Notebooks
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A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.