Why my laptop won't turn on?

@joseluisca96989 you will need to start trouble shooting it the same way as other devices with similar power issues. Start off with the easy things. Disconnect the power from the computer by unplugging the power cord from your computer. Disconnect all external devices from the computer. (disconnect the battery if you can)Now hold the power button depressed for about 30sec-1min. Reapply the AC power adapter and see if your computer does show any sign of life.

Next, you want to check your power supply. Make sure it has the proper voltages. Check to make sure that connectors are not bend etc. Check the DC-in jack of your laptop. Make sure there is no corrosion, debris etc. that prevents it from working. Clean it of any debris etc, use a few puffs of air to clean it out. If none of this works, get an ammeter and see if your laptop draws any amperage from the charger.

After that, you need to check and see if your motherboard even gets power. For that of course, you need to open it up. Post Some good pictures of what you see. That way we can see what you see. Once we have identified your motherboard, we can most likely find a way to check the motherboard for proper power.

To work on your computer, download the Lenovo Yoga 7 16IRL8 Hardware Maintenance Manual from this page Lenovo Yoga 7 16IRL8 under the Documents tab