Due to poor design of the E3 Mini/Turbo, V4.2.2, and V4.2.7 boards suffer from EMI on the LCD lines. This presents itself as if the LCD button is being pressed repeatedly or the feedrate on the LCD (the 100% changing) changing on its own. This is most common on the Ender 5 series machines.
This is not a firmware issue; this is an issue with the board itself and an oversight when they made the board.
Help Center Article with more details: https://support.th3dstudio.com/hc/en-us/articles/360052697631
Simply plug the board on to the EXP3 Header on your LCD and then plug the LCD cable into our board as shown below. No firmware changes are needed.
Video of the Issue this board fixes
Warranty & Support Information
TH3D Community Support - Technical support for the product is handled through our TH3D Communities. You can get access to them on our Community Page.
3 Months Warranty - Our warranty covers any and all defects with the product. If your product fails or has problems within the warranty period you can contact our support team by using the Contact Us link. This is for warranty related issues only, not technical support. Damage/Failure due to improper installation, usage, failure resulting from an issue with the machine the product is installed on, and/or modification or the product is not covered under warranty