Mobile is not power on

@ravitamiltv you are not giving us a lot to work with here. It would be nice to know what exact model your phone is and what you have already check or tried to fix this.

Start with the basics. First you want to check your power supply. Make sure it has the proper voltages. Check to make sure connectors are not bend etc. After that, check the charging port. Clean it of any debris etc, use a few puffs of air to clean it out. Make sure there is no corrosion, debris etc. that prevents it from working. If none of this works, get a ammeter and see if your phone draws any amperage from the charger. After that, you need to check and see if your motherboard even gets power. for that you will need to open it up. That will now all depend on the model.