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By: Arkus (offline) on Wednesday, December 30 2009 @ 09:47 PM PST (Read 3767 times)  
Arkus

First off, been having fun putting this together, good job!
Anywho, I'm having a problem with a few of the gren LEDs, all of them light up except for 10 of them, I've triple checked all the solder joints and everything is looking good, but for some reason they stay dark.
The ones that won't light up are: D15 & D25, D14 & D63, D52 & D62, D41 & D51, and D26 & D36.
For the life of me I can't figure out why they won't work. Ideas?


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By: Windell (offline) on Wednesday, December 30 2009 @ 10:32 PM PST  
Windell

Do you mean the LEDs on the green ring that are above the locations that you've named? Or do you actually mean the LEDs on the blue board?

The most likely cause is a couple of flaky solder joints on some of the ten jumpers that go between the boards. Touch up the connections to those jumpers.


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By: Arkus (offline) on Thursday, December 31 2009 @ 06:34 AM PST  
Arkus

Sorry, yeah, the LEDs above the locations I mentioned.
And I went over all the connections again to make sure they're all good, but still nothing.


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By: Windell (offline) on Thursday, December 31 2009 @ 09:57 AM PST  
Windell

Those 10 LEDs on the green board are all controlled by vertical jumper "LED8" that connects the boards together. This signal comes through R8, and originates at pin 14 of the microcontroller-- the one on the lower right corner; the corner closest to R10.

There is only one likely cause: that there's a bad solder connection at one of those places. Visually inspect both ends of the jumper wire, both ends of R8, and that pin of the chip. If anything is questionable at one of those locations, touch up the solder joint.


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By: Arkus (offline) on Thursday, December 31 2009 @ 12:44 PM PST  
Arkus

Aha, found the problem. Embarrassingly enough I completely neglected to put the resister in R8 problem solved.


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By: Windell (offline) on Thursday, December 31 2009 @ 12:54 PM PST  
Windell

> I completely neglected to put the resister in R8

That will do it every time. But perhaps you will understand why I didn't list it as a likely cause. Smile


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By: Arkus (offline) on Thursday, December 31 2009 @ 03:50 PM PST  
Arkus

Too true.
Now I just have to figure out what's going on with Red LEDs in the 10 & 11 oclock positions and why they won't light up right. When the 10 oclock one is supposed to light up (that would light 4 oclock, if you see where I'm going with this), instead a few blue and red leds light up really dimly. and with the other one at 11 oclock (that would light up for 5 oclock), it instead lights up both 10 & 11.... Somewhat frustrating that I've been over all the solder joints that I can think of to no avail.


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By: Windell (offline) on Thursday, December 31 2009 @ 04:08 PM PST  
Windell

It sounds like one of your red LEDs may be installed backwards. There is a flatted side on the clear plastic "collar" of each LED, corresponding to the side with the short lead, and which should be pointing towards the rounded (not squared) solder pad. All of the LEDs should be facing the same way.


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By: Arkus (offline) on Thursday, December 31 2009 @ 11:49 PM PST  
Arkus

Doh, you are once again right. I did the easy thing and missed that I had one LED backwards... Double check and miss it kinda thing. Thanks for all the help.
With that I successfully finished everything else and now have an awesome working Bulbdial!


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