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Raspberry Pi {Help!}

Former Member

Hey,

I have a raspberry pi and I bought this little monitor for it: http://www.amazon.com/3-5-Inch-TFT-Monitor-Automobile/dp/B0045IIZKU/ref=sr_1_1?ie=UTF8&qid=1395790355&sr=8-1&keywords=Mini+Lcd+Screen+Raspberry+Pi

It has the same "type" RCA port as the pi, so I wanted to take the port of the pi and monitor so I didn't have to drag around extra stuff and I thought it would be easy and a learning experience.

Unfortunately it is not working, the pi itself seems fine the area around the port may be damaged, but the rest if not all still works. As for the monitor, I have no idea if it is still working, it has to have a signal to work and the pi/monitor isn't responding to each other. I've attached some photos of what they currently "look like".

Red is Positive

Black is Ground

Yellow is Video

White is Sound

Red and black I have been connecting to the battery (to power the monitor).

Yellow I have been connecting to the pi.

And I have not been using the white.

Attachments:
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  • 0

    I am not sure if you seen this video yet but Ben hack a raspberry pi and a very similar mini screen in one of his project to create a mini mobile computer. It may not contain the answer but definitely worth a watch.

     

    Build Your Own Portable Raspberry Pi (Part 1) - YouTube

  • 0

    Hello Michael.

     

    I have exactly the same monitor and red and Red and White RCA connectors are definitely NOT power in line.

     

    Those are - if I recall - the stereo sound connectors.

     

    Some of those ePath china little monitors have external connector for the power line but they look different and they use to have a fuse.

     

    Like this one Amazon.com: 4.3'' Color TFT Car Monitor Support 480 x 272 Resolution + Car/Automobile Rear-view System Mirror Display Mo… it have 2 video lines and one power line connector http://ecx.images-amazon.com/images/I/41Hyxj5RIpL._SX425_.jpg.

     

    I am at job now, but this afternoon - London/Madrid time - when I get out, I make some pics with where to connect the power line for you.

     

    You must open the monitor and plug the power lines into it, on the 5V regulator.

     

    By the way, next time you should use a solder iron instead of a gas torch to desolder your Pi :-D - sorry for the silly joke :-).

  • 0 in reply to iagorubio

    Ok,

    Haha funny!

    yeah the red and white are defenately not the power.

    I would rather not get another screen, if you can could you post the pictures?

    Thanks!

    Michael

  • 0 in reply to Former Member

    Yep, I took a look at it before I made this post but I didn't find/see anything...

    Thanks anyway!

    Michael

  • 0

    Hello Michael.

     

    Sorry for the delay, had a couple of hard days at work.

     

    Whatching the pictures again I am not so sure about what I told you because those cables don't seem come be from the RCA connectors.

     

    The power line are those cables with the fuse on them. If you unscrew the fuse holder you can use alligator clips to power the screen.

     

    Just grab the positive to the wire coming out of the fuse holder and the negative to the power RCA connector with care of not touching the pin into it.

     

     

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    May be in this other picture you can see it better,

     

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    You can solder the power lines directly into the connector on the PCB.

     

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    As for the connection for the signal cable I used an RCA cable, much easier than to get out the PCB RCA socket, but from my tests the pad on the Raspberry that's connected to the signal wire on the screen connector is the right one looking at the back of the Pi, left one looking from the front of it (In the picture is the one being touch by the black probe).

     

    image

     

    Remember this is a car device so it may need around 12V to work.

     

    Not much help I am sorry.

     

    Best luck with your project.

  • 0

    I have one of these monitors for my Raspberry Pi.  There is no sound input just Monitor A and Monitor B - the Yellow and White RCA plugs.  The red one is power. The centre pin of this plug should be positive and the outer negative. These monitors work only when there is some video input on either the Yellow or White plug.  To get sound you will need a seperate speaker to connect to the Raspberry Pi.

     

    So in summary get a power supply between 6v and 12v and plug it into the red socket.  Connect either the yellow or white socket to the Raspberry Pi using a standard 3 plug cable. Turn on the pi and monitor and you should see the bootup sequence on the screen.

     

    Good luck.................