Raspberry Pi Forums

Hello, I've bought 3 touchscreen display 7" from Adafruit, but it is not working, no backlight, no signal, so, I need to change something in files? what i need to do?

You need to check the wiring before doing anything else.

Is the ribbon cable in the right way round (blue side down on the display board, blue side pointing to the edge of your RPi board)? Have you connected the power to the screen either with a USB to microUSB cable or with the dupont wires on pin #6 (GND) and pin#2 or #4 (5V0) on your RPi to the 5V0 & GND connectors on the display.

There an assumption it is the Official Display, but let's go with it. I'll move it to the correct forum.
Texy