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Defective Charlieplex Matrix?
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Defective Charlieplex Matrix?

by cupcake_doombot on Wed Dec 12, 2018 9:55 pm

looks like i might have a defective Charlieplex matrix. one of these: https://www.adafruit.com/product/2947

as you can see in the image, two of the LEDs don't fully light up. instead, nearby LEDs do inadvertently in a cross shape. i assembled everything following the adafruit learning center guide, so i'm guessing this board just contains some defects & i need to do an exchange. the first matrix & controller i wired up worked perfectly, so it looks like it's just this one.

My question is, since i've already assembled the matrix & controller board (one of these: https://www.adafruit.com/product/2946), should i attempt to disassemble things (risking damage to the Charlieplex controller), or just exchange both products?
Attachments
charlieplex-defect.jpg
charlieplex-defect.jpg (308.39 KiB) Viewed 86 times

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Re: Defective Charlieplex Matrix?

by cupcake_doombot on Tue Jan 15, 2019 3:20 pm

I'd like to bump this topic. my matrix still appears defective & i think my post got lost during the holiday rush.

help would be appreciated!

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Re: Defective Charlieplex Matrix?

by adafruit_support_carter on Tue Jan 15, 2019 7:50 pm

Yep. Sorry for the delay. Can you post a photo of the other side so we can check the soldering there.

What program are you running as a test?

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Re: Defective Charlieplex Matrix?

by cupcake_doombot on Thu Jan 17, 2019 12:24 am

here's solder joints on the backside:
matrix-back.jpg
matrix-back.jpg (186.21 KiB) Viewed 34 times


as for the code, looks like i forgot to keep the single pixel testing sketch i'd manually wrote from earlier. but the issue shows up with any code i try. here's the problem replicated using a the Adafruit IS31FL3731 "gfxdemo" sketch. this is in the middle of the "Hello World" scrolling text:
matrix-glitches-hello-world.jpg
matrix-glitches-hello-world.jpg (348.09 KiB) Viewed 34 times



i really like this little display; i'd be happy to exchange it for a new one. however, i'm very concerned about attempting to remove it & causing damage to the working controller that i've soldered to it.

let me know what my options are.

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Re: Defective Charlieplex Matrix?

by adafruit_support_carter on Thu Jan 17, 2019 1:24 pm

Thanks. That soldering looks excellent. It's probably just a bad pixel or something on the matrix. Let's just replace both.

Send an email to support@adafruit.com with a link to this thread and your order number and they can get you a new PID 2947 and PID 2946.

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Please be positive and constructive with your questions and comments.