Hello welcome to justanswer. My name is***** will be assisting you today. I will try my best to help you.It looks like a display gone bad but before jumping to such conclusion please answer the following
Is this a Lenovo T60 laptop ?
Which is the operating system installed in the PC.Is it Windows Vista, Windows 7, windows 8, Windows 10?
How old is this laptop?
Note: - Please reply using the box below.
Windows XP Pro. Lenovo yes. I've had it for 15 years
Thank you for the details.
Does the screen go darker even if its plugged to the charger?
Is the screen brightness set to max now?
It seems like you opened another question to reply,please reply in this page only
From the details you provided through the other question you posted it looks like the screen is faulty especially the back light tube or the power inverter board.
The power inverter board to the display doesn't cost much compared to back light tube.
Are you clear is there anything else you like to know ?