I have a Dell G3 15 3579. The display stopped working. Fans and keyboard backlights were on but the display remained off. I couldn't get an external display to work either. While troubleshooting, I removed the Intel WiFi/Bluetooth card and the display started working normally. I reinserted the WiFi card and the same issue came back. Also, the WiFi card was unusually hot if that is relevant. I am not able to find the same model (Intel 9462NGW) part anywhere.
This might help if you want to replace the card.