When the laptop comes on and the screen
light goes off but the image is very dark, or faint, most likely it's either
failed screen inverter or backlight lamp (CCFL)
failure. When either one fail, the backlight stops working.
You'll need extra spare parts to work on
this. You may need a new working inverter or known good backlight lamp.
Search how to troubleshoot backlightfailure.
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