laptop while screen and to broke a part Lavina

@sandhyamishra if your screen just shows white, that means that only your backlight is working. You are not getting any video data. Connect an external monitor and see if that displays properly. If it does, you know it is your LCD display that either needs to be replaced or the display cable needs to be replaced. You can make that determination when you open your computer to work on that.

Now, if a external monitor also does not display anything, you are having issues with the GPU. That may or may not be fixable but it will be a board level repair on your motherboard. To assist with that, we will need to know the exact model of motherboard you have. It'll be printed on the motherboard itself.

Lenovo K14 1st Gen Hardware Maintenance Manual