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Left side of 64x64 RGB LED matrix is a green bar
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Left side of 64x64 RGB LED matrix is a green bar

by hdmoore on Wed Nov 11, 2020 9:11 pm

I recently purchased the 64x64 RGP matrix and corresponding bonnet and after extensive troubleshooting, I believe the bonnet is bad, since it appears to have the same issue as this thread:
- viewtopic.php?f=47&t=170770&p=838423

The parts and configuration are the same:
* 64x64 RGB LED Matrix - 2.5mm Pitch - 1/32 Scan: https://www.adafruit.com/product/3649
* RGB Matrix Bonnet for Raspberry Pi: https://www.adafruit.com/product/3211

For the initial setup I configured a 4B+ with the bonnet in high quality mode, soldered the jumper for E to pin 8, and pin 4 to 18, then rebooted.

This resulted in the left half of the screen being mostly green. I tried various settings for gpio pin configuration, delay settings, and three different versions of the rgb-matrix software, and all had the same outcome. I swapped the bonnet to a RPi 3B+ instead and had the same outcome (using the Buster/Debian 10 version of Raspberry Pi OS - 2020-08-20).

I checked the traces, switched to normal (not high quality) mode, rebooted, had the same outcome. I tried switching power supplies and had the same issue. I tried (for kicks) powering the pi off the LED supply as a backup and this had no effect.

It sounds like the bonnet is bad. Is there anything else I can try?

ghost.png
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hdmoore
 
Posts: 6
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Re: Left side of 64x64 RGB LED matrix is a green bar

by hdmoore on Wed Nov 11, 2020 9:20 pm

Some additional photos. This is in convenience (low quality mode) and with the Pi powered from the LED supply (but the issue is present either way).

bottom.png
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bottom.png
bottom.png (609.54 KiB) Viewed 110 times


bottom.png
bottom.png (609.54 KiB) Viewed 110 times


I have no idea why the photos are being shown multiple times, this seems like a forum bug.
Attachments
top.png
top.png (867.45 KiB) Viewed 110 times
matrix.png
matrix.png (657.05 KiB) Viewed 110 times

hdmoore
 
Posts: 6
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Re: Left side of 64x64 RGB LED matrix is a green bar

by hdmoore on Fri Nov 13, 2020 12:21 am

Some notes from a multimeter while the Pi was booted but the LED is idle:

A/B/C/D/E: All zero as expected
R1: 3.14
R2: 0
G1: 0
G2: 3.99
B1: 0
B2: 0

It seems like G2 is stuck high?

hdmoore
 
Posts: 6
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Re: Left side of 64x64 RGB LED matrix is a green bar

by hdmoore on Sat Nov 14, 2020 12:06 am

Hello! Any chance I could receive a replacement board? G2 is shorted to the 5V power on this bonnet PCB (it has a stuck G2 even without a Pi connected).

hdmoore
 
Posts: 6
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Re: Left side of 64x64 RGB LED matrix is a green bar

by hdmoore on Fri Nov 27, 2020 6:30 pm

Hello! It has been a couple weeks, any chance I can get a reply from support, or a replacement?

hdmoore
 
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Re: Left side of 64x64 RGB LED matrix is a green bar

by danhalbert on Sat Nov 28, 2020 6:03 pm

Sorry, I have brought this to the attention of the support staff.

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Re: Left side of 64x64 RGB LED matrix is a green bar

by adafruit2 on Sat Nov 28, 2020 8:00 pm

email support@adafruit with a link to this thread to request a new bonnet

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Please be positive and constructive with your questions and comments.