Re: 3.5" TFT screen for PI
And... it's not connected to the GPIO pins via the ribbon cable.
I'm not sure what that's about, but it is somewhat misleading as it does look as though it is connected as you describe.
The image shows the display powered up but there is no connection to the red and black power wires. (Hello? Photoshop...)
The composite video connection is made to the RPi through a Male to Male RCA "gender changer" as it should be, but the power wires will need to be connected to an external power supply of the correct voltage and current.