2020-03-04 07:42 AM
2020-03-04 07:54 AM
The LCD back-light control is via pin PK3 (LCD_BL_CTRL) see schematic.
STM32Cube_FW_F7_V1.15.0\Drivers\BSP\STM32746G-Discovery\stm32746g_discovery_lcd.c
See
BSP_LCD_DisplayOn() and BSP_LCD_DisplayOff()