5" Jumpy screen?

josephchrzempiec

Hello i bought a 5" inch TFT LCD Display for my Raspberry pi A+ board. When i hooked it up the Screen is Either flicking or jumpy a little Hard to explain what I'm seeing. But it is not a clear screen. I did try to follow Adafruit tutorial for the Screen Resolution But it is Setup for a 4.3" inch tft LCD. https://learn.adafruit.com/using-a-mini-pal-ntsc-display-with-a-raspberry-pi/configure-and-test And Mine it s a 5" inch Display. when i set it for the 4.3" Size the screen went smaller and the flickering/Jumpy Went away but the screen is small.

It is a Rear view car mirror http://www.ebay.com/itm/401214104257

I have not change much only uncomment the frame buffer width and height. Then change it to match my screen size.
framebuffer_width=800
framebuffer_height=480

I'm using retropie 4.0.2 Can someone please help me out?

cyperghost

Maybe wrong PAL/NTSC settings?

https://retropie.org.uk/forum/topic/4269/popeye-pi-foldable-rpi-zero-in-a-car-monitor/2

take care of the sdtv_ and overscan settings. Is your resolution the right one? Is the Composite connecter in right position? Maybe you can connect a working composite device to the monitor and then try to connect the Rpi?

obsidianspider

800x480 is definitely a 16:9 aspect ratio, so try something like an old DVD player with composite out, or a Nintendo Wii, something that isn't HD but can do widescreen.

josephchrzempiec

Hello thank you all for the reply back. It came with a rear view car camera and i tried that. Surely a clear perfect picture no jumping around. It's only in the raspberry pi it's doing this.

cyperghost

@josephchrzempiec Here are some parameters to figure out.
http://raspberrypi.stackexchange.com/tags/config.txt/info

Please post a working config if you are ready. How do you connect the monitor with the RPi?

obsidianspider

@cyperghost It looks like sdtv_aspect=3 16:9 is what @josephchrzempiec is looking for.

josephchrzempiec

Hello thank you for the link I'm not sure which i need to do to make it better i did notice one thing sense say its was a 16:9 i found the sdtv_aspect=3 16:9 in that link so i change it from 1 to 3 and that cleared a lot of up there is some small jumpy or flickering going on but it is a lot better then before. also i notice a little shaking going on not as bad as before .

monstermadeofman

Hey there dude, The screen might not run on 5volt. I've used a back up camera screen for my Gameboy Zero project and I had to modify it to run. Can you post a pic of your drive board.

I'm assuming you are running from the composite signal

josephchrzempiec

Hello yes a composite signal.

monstermadeofman

@josephchrzempiec

Can you post a more brightly lit picture, I can't see where you have soldered your jumper wire. I'm not 100% you've soldered the jumper to right place.

Did you trace it yourself or did you use an online tutorial?

josephchrzempiec

Not much light here I will try to do better. I removed the 1509 chip the 8 pin that converts from 12v down to 5v but i had a hard time solderings that small with my hands shaking So i traced it out and a Diode that is connected to that pin i Solder to. I traced it my self and using my multimeter.

monstermadeofman

@josephchrzempiec

Ok. It looks similar to the gearbest screen that I've used just some slight variation in layout. But generally the same.

If you take a look at this baord. The 2nd leg on the chip that is highlighted is where I did my 5v conversion.

If your chip code matches that I'd suggest working your way from there, the only other thing I can think is your power supply just ain't hacking it.

josephchrzempiec

Hello same chip 8 pin. The power I'm using is 3.7v 5500mah buck boosted to 5v 2a output. I tested the current from the screen and raspberry pi and total came out to 843ma Way under the 2a mark. The battery pack is good. the thing is i tested a few minutes ago the rear view camera while the LCD was on the battery pack and clear clean video. But when going back to the raspberry pi that is when the problems come in.

monstermadeofman

@josephchrzempiec What powerboost are you using might I ask?

josephchrzempiec

Here it is

I'm wondering something If there is some noise on the line it's self that is causing this problem?

monstermadeofman

@josephchrzempiec

So what are you using to charge the battery? I'm assuming you have a regulator for battery charging? Because all that is, is a step up converter.

josephchrzempiec

@monstermadeofman I have a 5v 4a input is my power supply. to 3.7v 1a output charging module.

monstermadeofman

Might i suggest making this alot easier by putting it all into one module as I feel you are over complicating the entire thing.

http://www.banggood.com/37V-Liion-Battery-Mini-USB-To-USB-A-Power-Apply-Module-p-928948.html?p=9B1915347037201311DI

This is used quite alot in GBZ builds. It let's you charge and play at the same time. It also has the powerboost built into the board so no need for that.

the other option while alot more expensive is the Adafruit Powerboost 1000c

Just google it. So many places sell them.

cyperghost

@monstermadeofman
I don't want to stop your helping hand but ....

@josephchrzempiec said in 5" Jumpy screen?:

Hello thank you all for the reply back. It came with a rear view car camera and i tried that. Surely a clear perfect picture no jumping around. It's only in the raspberry pi it's doing this.

monstermadeofman

@cyperghost

Yeah I think the issue at this point man is how he's supplying power. Seems a bit convoluted and is probably a power issue if it's ok when just using the camera with it.