This display uses the CH422G port expander.

IO1 TP_RST // Touch screen reset pin

IO2 LCD_BL // LCD backlight pinout

IO3LCD_RST // LCD reset pin

IO4 SD_CS // SD card select pin

IO5 USB_SEL // USB/CAN select pin

When changing the level of any CH422G pin, it is important not to change the state of other CH422G pins