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Hobby Components 8x8x8 Cube Kit (HCKITS0050) 
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Joined: Tue Jan 02, 2018 12:58 pm
Posts: 13
Post Re: Hobby Components 8x8x8 Cube Kit (HCKITS0050)
I've dismantled the cube matrix, and gone back to double checking each individual LED assembly, due to the resistance reading I was getting. I checked continuity between the anode/cathode, cathode/cathode and anode/anode on each of the 8 assemblies. As I result I have replaced 7 LEDs that were allowing current to flow in the reverse direction, and then re-checked continuity. Everything as far as the LED matrix goes is now how it should be.

Checking pin 2 on U1 directly to ground gives an initial reading of around 1950 ohms, which slowly drops to 1750 ohms where it remains steady.
Pin 24 on the micro controller to ground shows open circuit, as does this pin to U1 pin 2!!

Image

I will go and reflow Pin 24 and report back.


Last edited by Scarebird on Mon Feb 12, 2018 3:10 pm, edited 1 time in total.



Mon Feb 12, 2018 1:24 pm
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Joined: Tue Jan 02, 2018 12:58 pm
Posts: 13
Post Re: Hobby Components 8x8x8 Cube Kit (HCKITS0050)
Pin 24 has been re-worked and there is now a connection through to pin 2 on U1. I also re-worked pin 25 as that was looking a bit dodgy in the photo as well. I no longer have a reading from pin 2 U1 to ground, so fingers crossed. All I need do now is reassemble the cube and see how things go.


Mon Feb 12, 2018 1:52 pm
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Joined: Tue Jan 02, 2018 12:58 pm
Posts: 13
Post Re: Hobby Components 8x8x8 Cube Kit (HCKITS0050)
SUCCESS

Difficult to believe that a) I didn't solder that pin correctly to start with and b) missed that it was a poor joint the first time I checked it.

I don't think I am solely to blame though, having identified quite a few LEDs that were passing current in the reverse direction. I must stress that all LEDs were checked to see that they lit up correctly before I started putting the cube together, but that didn't pick up the dud ones.

Andrew, I'd like to say a big thank you for taking the time to read my posts detailing my problems and for then coming back with suggestions which, happily, enabled me to finally get the cube working as it should.

Thank you.


Mon Feb 12, 2018 3:07 pm
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Joined: Sun Aug 05, 2012 4:15 pm
Posts: 746
Post Re: Hobby Components 8x8x8 Cube Kit (HCKITS0050)
That's great. Knew the layer issue had to be something to do with those pins. Sometimes bad joints can be hard to see without a magnifying glass and good lighting but at least with your helpful information we could quickly pinpoint the problem. Enjoy your cube.

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Mon Feb 12, 2018 4:46 pm
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