sudomod

Okay so I've been wracking my brain over this for most of the afternoon, but I can't seem to get the BW backup camera screen to give me a picture. The screen is variant 8 on the wiki and I have tried both 5 volt modifications. Everything is wired up correctly and I can't find any shorts but I still end up with a white screen, I tried formatting my SD card and adding retro pi for pi 1/0 and it still doesn't seem to work, any ideas before I order another screen off amazon to try again?

I have had all kinds of problems with these screens. I have gotten 1 of 4 to work and it is constantly blinking and staticey. The one I have gotten to work I did not need the jumper. I just removed the original power and and went straight to the 5 v input. Have you tested your pi with another composite screen?

Straight to 5v as in just plugging it in as is? And no I haven't tested it with a different screen yet, I've been meaning to but work has kept me from having time to work on this project

I'm having the same issue with the same screen.

I'm using "method 1" as listed on the wiki. Any ideas?

OP any luck? I am also having this exact same issue with the exact same screen.

Enviola wrote: ↑

Thu Jun 08, 2017 7:06 am

OP any luck? I am also having this exact same issue with the exact same screen.

Check if your solder is not touching any other components.

cobramike wrote: ↑

Thu Jun 08, 2017 7:57 am

Enviola wrote: ↑

Thu Jun 08, 2017 7:06 am

OP any luck? I am also having this exact same issue with the exact same screen.

Check if your solder is not touching any other components.

I checked that pretty carefully and the only questionable spot place where it is really close to other components is on the controller board modification (change over to 5v)

I also tried swapping the Yellow and White connections on the Pi but that didnt work.

HDMI input works well so I dont think it is a RPi issue,
I made sure the ribbon cable was attached correctly too.

I'm just at a loss.

I saw a post that said only one composite connection is necessary on these screens (either white OR yellow). Is it possible that using both is causing some sort of interference?
I cant imagine that being the issue because how would the screen ever function normally if they are both plugged in?

The only thing I have not yet tried is the Second modification method from the Wiki.

http://sudomod.com/wiki/images/a/a5/IMG_0480.JPG

If I'm looking at this picture correctly, it seems like the red 5v wire is soldered to the GROUND connection on the board and then bridged with solder to the 12V input and over to the chip. That seems really weird to me, Why are the ground and power connected in the same port? It just seems counter-intuitive to me.

*EDIT*
I also just found this, would it help?
Setting up the software
First things first: either SSH into your Raspberry Pi, or open up a terminal window.

Start by opening config.txt in your editor of choice. We’ll be using nano:

sudo nano /boot/config.txt
1
sudo nano /boot/config.txt
There are two lines in the file that you need to edit. Firstly, you need to remove the comment ‘#’ from the following line:


#sdtv_mode=2
1
#sdtv_mode=2
So it should now look like this:


sdtv_mode=2
1
sdtv_mode=2
Then we need to add a comment ‘#’ to the following line:


hdmi_force_hotplug=1
1
hdmi_force_hotplug=1
So it should now look like this:


# hdmi_force_hotplug=1
1
# hdmi_force_hotplug=1
That’s it. Remember to save your file – if you used nano, press CTRL+X to exit; then, when asked if you want to save changes, enter Y then press RETURN.

Now you can plug your RCA cable into your TV/monitor, and you should hopefully see the video output.

I'd be curious to see how he's wired up to the Pi. Also, as cobramike suggested, the soldering looks suspect. Particularly the white composite cable has copper exposed.

dryja123 wrote: ↑

Thu Jun 08, 2017 12:35 pm

I'd be curious to see how he's wired up to the Pi. Also, as cobramike suggested, the soldering looks suspect. Particularly the white composite cable has copper exposed.

Ya when i look @ his solder work. Its not nice. Also the pic is not that clear to see. Clean your board up. And please make a new pic of the aria where you solderd. Thanks buddy

Enviola wrote: ↑

Thu Jun 08, 2017 12:11 pm

I saw a post that said only one composite connection is necessary on these screens (either white OR yellow). Is it possible that using both is causing some sort of interference?

Possibly. I can't be sure. But these back up camera screen have two channels, or whatever, so they can take in two feeds. Most likely back up camera and DVD player for the kids. So only use one, yellow will do, and then make sure your ground (black) also goes to the Pi. So power (5v), ground, and signal need to all come from the same place. Once hooked up, plug the screen's menu buttons back in and if you still don't get a picture, try switching to AV2 or whatever it is on your screen.

But do show us how it's hooked up to the Pi. We'll need to see the whole circuit to be able to tell what could be wrong.