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Thread: Petit Crouton - no main LED power

  1. #1

    Default Petit Crouton - no main LED power

    Hey all - just got the last of my parts in to build my first saber. Started wiring the Petit Crouton board tonight...so far as I can tell from the manual, everything seems to be wired correctly... i've got my 2 li-ion 14500 trustfires, speaker, switch, and luxeon rebel star soldered into the appropriate pads. When I power it on, the appropriate sounds are working (as well as swing/clash sounds, etc)...all seems to be functioning except for the important part...the LED. I threw a voltmeter up to the pads and it read a big zero. After pulling a few hairs out i snipped the wires and ran the LED straight to an old 4xaaa battery pack (with appropriate resistor) and verified that the LED does indeed work when powered directly.

    Is there anything obvious that I'm forgetting perhaps? getting desperate at this point...hoping I didn't throw $125 down the drain

    The only thing I've been able to notice is that the positive LED pad is pretty tight next to a connector for a different component on the board - not sure what it is...in the manual on the site it shows up as a round component on the far right edge in the middle, just above the positive LED pad... on my board it happens to be more squarish. At any rate i'm not sure what that component does, and unfortunately i didn't get a good enough look at that area before i began soldering to see the "before"...right now though it looks like there might be a connection or some solder that's bridging what small gap there might have been between that component and the positive LED pad. I tried cleaning out as much solder as I could and it still looks too tight for me to tell if there's a bridge there or not. So i guess my questions would be: what's that component above that positive LED pad for, and should it be connected in any way/shape/form to that positive pad? again the area between them is so small that i can't really tell if it even is connected or not...i'm just grasping at straws right now trying to figure this out

    The yellow ring outlines where I'm talking about on the card:

    PC-L.jpg

    Unfortunately that pic isn't a high enough resolution for me to zoom in and see if there's supposed to be a connection in there between those 2 components.

    Thanks for any help/suggestions!
    Last edited by ibskyde; 10-21-2011 at 10:44 PM.

  2. #2
    Sith Minion bk_renesis's Avatar
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    It should be bridged to the pad.
    "The Sith grew past the use of lightsabers. But we continue to use them, if only to humiliate the Jedi."―Darth Sidious

  3. #3

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    Not trying to sound obvious but did you reverse the polarity?

  4. #4

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    to be honest... THAT HAPPEBNED TO ME!!!! ask PR lol he helped me lol. get desoldering braid and start cleaning that area. My situation ended up ok.
    "The force is everywhere, it binds us togeather"

  5. #5

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    Quote Originally Posted by Wong Yoon Wei View Post
    Not trying to sound obvious but did you reverse the polarity?
    haha there is no obvious for me i know some bits here and there when it comes to electronics but i'm far from what i'd call knowledgeable. Are you asking if i just wired the LED backwards? if that's what you meant then i did double check all that. if you meant something else then i might need a bit of direction as far as what to check.

    thanks again!!
    Last edited by ibskyde; 10-22-2011 at 11:05 AM.

  6. #6

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    well i went through with the vacuum sucker and the braid and cleaned up all the solder in that area and redid each of the connections...same story :/ sounds all work when it powers on, but nadda out of that main LED. Pretty positive I hooked the wires to the correct pads (pretty easy with this one...a clear + and - next to each one heh)- just to make sure though I even tried swapping them but of course no difference. afterwards, i hooked the LED up directly to a power source and sure enough it's still working fine. It just doesnt seem like the board is pumping out and juice to that main LED pad (not sure what i should be reading, if anything, when putting a voltmeter on those pads while the switch is closed and the led should be on...but currently i'm reading 0 still)...is it possible i got a dud? Or is there anything else on the board i should check that could impact this?

  7. #7

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    here's a pic of the board...and i know i know my soldering is a bit rusty...not the cleanest but everything else works and i haven't seen any obvious shorts, except from the main LED positive pad to the component above it, which someone replied earlier was supposed to be bridged. Anyways if anyone is able to see any obvious issues or failures on my part, i'd welcome the criticism at this point i just want the lightsaber to have...light...haha.

    IMG_0500.jpg

    Top left pair = batteries, mid left pair = speaker, top center 3 = switches, bottom right = main LED

  8. #8

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    If it's not bridged somewhere top or bottom (can't tell from that pic). PM Zook here and he can repair it.

  9. #9

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    i think you have the same issue as me. next to the square piece is the LED pads, did and solder get on its holder? thats what happened to me.
    "The force is everywhere, it binds us togeather"

  10. #10

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    hmm i might be too new to these parts or something...not looking like i've been given messaging permissions yet :/ ah yes looking now im about 14 days short according to the faq - d'oh
    Last edited by ibskyde; 10-22-2011 at 09:48 PM.

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