Monday, January 23, 2017
I recently got this 5" TFT LCD composite monitor, and I was able to connect it to and power it from a Raspberry Pi 3. Here is how I did it.
I opened up the case to expose the bare LCD and driver board. The case is just two pieces of plastic snapped together, so I pried it open with a screwdriver. You can see the original input wires connected to the board: red - 12-24 VDC, black - ground, yellow - composite video 1, and white - composite video 2.
I removed the original wires and connected the three wires shown below: yellow - composite video, black - ground, and blue - 5 VDC. The blue wire is (thin) 30 AWG wire that is easily soldered onto the PCB.
I connected the three wires to the Raspberry Pi as shown below using a TRRS connector: yellow - composite video (S), black - ground (R adjacent to S), and blue - 5 VDC (pin 2 of the Raspberry Pi connector).
Here are the relevant /boot/config.txt settings I am using.