Monday, January 23, 2017

Chuanganzhuo 5" TFT LCD Monitor Plus Raspberry Pi 3





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.

overscan_left=-24
overscan_right=-24
overscan_top=-20
overscan_bottom=-20
framebuffer_width=400
framebuffer_height=240
sdtv_mode=0
sdtv_aspect=3

Enjoy!