Yes that's correct. Removing the jumper will break the power (VCC) supply to the backlight.Is J3 on the schematic the pin header with the link attached ?
It's the following 4 way anti-reverse cable:Can you also advise a part number for the 4 core lead that is shown in the photo's ?
https://hobbycomponents.com/cables/68-4 ... cable-30cm
If you don't need it to be anti-reverse there are the following alternatives which can be stripped into 4 way pieces:
https://hobbycomponents.com/cables/648- ... cable-10cm
https://hobbycomponents.com/cables/114- ... cable-pack