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This tutorial would help you solve the problem to press power button and the laptop LCD went totally dark.
I will explain how to find the failure reason for the dim LCD Screen of a laptop, but the tips are not aiming for some special brands or models, they should work for most laptops.
After press on the power button, I took a closer look at the laptop LCD and find that the screen is not completely black. The laptop screen still works but the image is very dim.
I was not sure if it was the inverter or the backlight has a problem. But the laptop works fine with an external monitor.
Picture count 12 please continue have a look
Click picture for full size image.
Step 2: Find and remove the screws on the bezel cover
Before you begin working, it's best to remove all sources of power first. In this case, that includes the AC Adapter and the battery. Don't forget to remove the battery!
First, you'll need to locate the screw covers. These small rubber covers are generally found on the front of the display's bezel (surrounding frame), though on some notebooks you might find some of the covers along the side of the screen.
Look at all the metal and plastic parts. In others, Failing to find them, do a Google search for a take-apart instruction for your specific laptop.