I accidentally turned off my laptop during complete factory reset.

It would appear the factory reset was cut short before Windows re installed itself. It is hard to determine if the laptop will reset, be in a boot loop, or awaiting user input, since the built-in display is already broken. This is great news because you can indeed use a TV or external monitor to install Windows, if the laptop is capable of displaying videos when it boots. Most laptops will automatically detect an external monitor, however some may require a key combination to switch between the laptop screen and the external monitor (usually Fn + F4, F5, F7 or F8). If you are reinstalling Windows I would recommend you try the following: Connect TV/monitor and turn laptop on. 2. After a few moments, check to see if the display comes on. 3. Attempt the shortcut key combination of display switch. 4. Unplug any superfluous USB devices. If you are still not able to see the video, then a USB drive with Windows using the Microsoft Media Creation Tool is a good next step. If there is a corrupt Windows installation, it may be possible to boot from the USB and get video output on the external display. Keep in mind, however, that if the laptop screen does not even come on during boot-up (manufacturer logo, BIOS screen, etc.), it may be a problem that's more serious than Windows. If so, it is unlikely that reinstalling Windows will be of any benefit until you can access the BIOS or determine if the laptop is able to output to the external display. Once you get video out to the TV or monitor, it's likely a clean Windows installation will be the easiest path to recovery because you don't need the data.