iPod no video after digitizer repair

How do I tell if this iPod even works?

Antwoord op "Home button spring: necessary or not needed?"

Antwoord op "Replacement battery needed for installation"

Antwoord op "My backlight isn't working now? Maybe I got it too hot?"

Antwoord op "iPod doesn't turn on"

Antwoord op "Install a 4S camera in a 4?"