|If you haven't damaged it otherwise, it should display fine if you connect an external monitor to it's video port. |
DO NOT plug in or unplug a monitor's video cable into / from a video port while the computer is running. Doing so can damage the monitor's circuits and/or the video adapter's circuits.
Some laptops will display on an external monitor without you having to do anything.
If you get no video on an external monitor, some laptops have a key combo that you must press to toggle the display to external video only / built in display video only / sometimes both - see the Owner's or User's manual for the model.
The screen is not all that expensive.
Search using something such as: replacement screen MSI U123
MSI WIND U123 Screen
MSI has only a User manual, not a Service manual, and I've found no Service manual for it on the web
Search for something such as: replace screen MSI U123
to find random instructions
Replace screen U123 - not in English, but has subtitles