This bridge board is used to supply separate 5V power to the ODROID-VU7 and VU7 Plus. When the computing / power load on the XU4 board is very heavy there is an occasional 0.5~0.6V ripple on the 5V rail of the USB host port. This ripple voltage causes a visible flickering of the Vu7 and Vu7+ LCD backlight.
The touchscreen controller also requires an input voltage higher than 4.5V, so to supply this and avoid these issues you can use this power bridge board.
*You need to purchase a 5V/2A PSU separately.
The schematics for the bard are available from the below:-
Micro USB-DC Power Bridge Board 
- Brand: Hard Kernel
- Product Code: Micro USB-DC Power Bridge Board
- Availability: In Stock
- Ex Tax: 1.15€