DiyLightAnimation
Hardware => Lynx Express => Topic started by: Orion on October 16, 2013,
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I am having issues with a 3.3 volt led not lighting on my express. I checked all components to make sure they are right. Any suggestions.
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Is the express working? The led might be in backwards.
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No LED is installed correctly per silk screen on board. I haven't went any further with installing chips and pics. I saw a mod for 2009 time frame that ran a jumper wire from the 5V to the 3.3V regulator. Is this still an issue?
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If you are 100% sure you have the 3.3V regulator installed, what do you have voltage-wise on the 3 pins?
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What version ofthe LE is this?
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This is version 5.
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No mod is needed for a version 5 that was all changed. Do you have the 5v led lit?
RJ
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Yes the 5V LED is working.
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Put a meter across the led and see if you have voltage. Might just be a bad led.
RJ
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If possible, make sure you have the 3.3 volt regulator installed and not a scr. I did this once and the led did not light. I think I had channel 13 stuck on, guess where the 3.3 regulator was.
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I measured voltage across the LED's 5V is 2.1 V and 3.3V has no power. I took a few images of the board in case someone can see anything. I took the heat sinks off the regulators to verify they were correct.
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I have not looked at the assembly manual, but in your second picture, the reistors by the terminal block at the top look like they are both the same, but appear to be going two different directions. You would have to check the assembly manual to see if you have them correct. I found some of the pictures just aren't color accurate enough to tell for sure on the pieces I have assembled.
Alan
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I got it. My pictures helped me out. The voltage regulators were in the correct spot. But backwards according to the silk screen <fp.. Like my super smart engineer mentor always say's it's obvious to the casual observer.
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Resistors are not polarized; they can go either way...
/mike
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Resistors are not polarized; they can go either way...
/mike
Thank you, I did not know that. The manuals go out of their way to state caps are not polarizes (correction SOME can be so read the manual), therefore I fretted about my directions on the resistors unnecessarily. I will just arrange them for aesthetics then in the future.
fixed up some errors for future readers..
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Thank you, I did not know that. The manuals go out of their way to state caps are not polarizes, therreforre I fretted about my directions. I will just arrange them for athestetics then in the future.
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Actually, the manuals usually say something to the effect that it looks more "professional" if you make them all the same way. The fact is, that if you are paying attention to which why the resistors are laying... you are paying attention to the board which will result in less errors when you place the parts on the board. Besides... its just a good habit to get in to. :)
Hope my "soldering help" book did just that... helped.
Jamie
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Greetings,,,
Just in case someone gets confused later while reading this thread. Some capacitors are polarized, some not. The manuals point out this.
Keith
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Yes, the small yellow disk or ceramic caps are not polarized but the Electrolytic caps are and it's best to know the difference between them before soldering them to the board.
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Thank you, I did not know that. The manuals go out of their way to state caps are not polarizes, therreforre I fretted about my directions. I will just arrange them for athestetics then in the future.
That is Not true. Some caps are not polarized other caps are polarized. The assembly manuals will state that.
Rick R.
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Noted, and original reply fixed with some adlib to not waylay someone errant. Learning a bit each day here.