LCD or Touch Digitizer

How do I know if my LCD or Touch Digitizer needs to be replaced

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Please verify the model number of the laptop?

What is not working or is something damaged?

Your question is a bit vague as to what the problem is

Can you see images on the screen display OK and it's just the touchscreen is not working.

If the screen is OK can you navigate OK using the touchpad (aka trackpad) on the keyboard?

if there is no visible display on the screen when the laptop is turned on, try connecting an external monitor to the laptop's HDMI port and check if its display is OK. Even a TV can be used as an external monitor. Remember to press the display action key (4th key from the left, top row) to toggle the display between the laptop screen only, external screen only or both screens on together.