Replacing your dying battery to bring the power back to your laptop.
Replacing the cooling fan to reduce the loud, irregular sound.
Replacing your touchpad if it is unresponsive and/or overly sensitive.
Replacing your battery to increase the amount of memory on your laptop.
Replacing your audio speakers to get rid of distorted audio sounds.
Use this guide to replace the back panel of your Lenovo Ideapad Flex 4-1570.