I'd like to turn on a broken laptop LED backlight without laptop and use it as light panel. How can I do it? Thanks
Most laptop LED back-lights are based of 1 or multiple constant current boost drivers, you would likely need to identify which pins are the LED's (may be documented depending on the model), and then build a similar circuit to power them,
If you know the make and model, the technical information of what pin does what, and possibly even what voltage and current is used may be available.