Respuesta a "Why is my front facing camera not working?"As a last before replacing the camera module, try to do a factory reset. Sometimes, more often than not, there may be a software glitch that will cause the camera module drivers to operate improperly.
Respuesta a "Why does my tablet only turn on when connected to the charger?"It could be a cold solder joint where the battery is connected to the main logic board. Check with a magnifying glass and re solder if necessary.