Issue with Screen Display (Wermy GBZ)

[tw!tch]

New to this, so please forgive the terrible soldering (though that may be the problem itself):

I'm unable to get a picture to my Adafruit 3.5" display used in the original guide. I've wired it as far as I can tell to run off 5v and I'm trying to test it with my Pi Zero. I can see the display is backlit and powered on, but I can't see the Retropie loading screen. I've tested it with the HDMI connection and can confirm that the OS is loaded and working properly. I can only think that either A) my soldering is so terrible that I've just fried something or B) a wire is not in the correct place.

If anyone had any suggestions I would be truly grateful.

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[jostie94]

Wiring seems to be properly connected. Check your ribbon cable, is it undamaged and al the way in the connector on the pcb?

[tw!tch]

Thank you for taking the time to check!

Cable looks good to me (a small cosmetic blemish) and seems to be seated well.

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[jostie94]

I've been spending a whole day searching for the reason my screen did not work. Turns out I was wrong with the ribon cable all the time, I was putting it in upside down every time

Anyway, try this:

- format tour sd card and install a fresh copy of retropie.

- do you have a multimeter? If so, check if there is a connection between the yellow and the white wire. It looks like they touch each other on the pcb of the screen.

- Try connecting the output of the pi to the input av2 of your screen. On the PCB of the screen: yellow to gnd and white to av2.

[tw!tch]

-Just tried formatting the SD card and reinstalling Retropie. Tested OK with HDMI but no dice with the screen.

-Multimeter tested OK as well with the connections, including power+ground from where the regulator was all the way to the Pi and video+ground. Decided to switch to AV2 anyway to see if that would help, but alas, same issue.

I'm thinking I must have broken something on the screen PCB or maybe got a lemon. I've looked around but couldn't find any other settings to adjust on the screen, and the Pi shouldn't have anything weird as I haven't touched that firmware since I got it

[AAMinistry]

I can't remember for the Adafruit screen but I know that for my BW screen you only need yellow or white connected to the Pi not both (one is AV1 the other AV2 on the BW screen).

[HoolyHoo]

Try adding:

Code: Select all

sdtv_mode=0

To your config.txt file and place a # in front of anything that begins with hdmi and see if that works for you.

[jostie94]

I can't remember for the Adafruit screen but I know that for my BW screen you only need yellow or white connected to the Pi not both (one is AV1 the other AV2 on the BW screen).

I use the adafruit screen in my current build and can confirm that you can use both wires. One for video signal and the other is GND.

[AAMinistry]

I can't remember for the Adafruit screen but I know that for my BW screen you only need yellow or white connected to the Pi not both (one is AV1 the other AV2 on the BW screen).

I use the adafruit screen in my current build and can confirm that you can use both wires. One for video signal and the other is GND.

Ah okay, just something I noticed. Saved me watching the original videos again when I get home from work

[tw!tch]

Neither modifying config.txt or (just to see what would happen) removing the ground from the ground+video pair on the Pi seemed to help. Still just a powered on screen with no image.

I appreciate the help, I may just get another screen.