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Author Topic: 3.3v led not lit  (Read 930 times)

Offline Kappa2006

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3.3v led not lit
« on: November 21, 2011, »
I plugged my LE in for the first time tonight, with no chips installed.  The 5v light is lit but the 3.3v light is not.  LED orientation is good, and I've gone over the board touched up some solder joints with no luck.  I measured voltage at the inop led and I have 2.4 volts, compared to 3.5volts at the working led.  Any suggestions on where to look next?  Thanks.

Brian
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First show, 2011: 48 channels (ssr4's, lynx express, MR16), sequenced with Vixen, using 5000 led and incandescent lights

Offline deplanche

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Re: 3.3v led not lit
« Reply #1 on: November 21, 2011, »
Check the numbers on the voltage regulators and make sure they are correct.  That was my problem last year.  Sometimes the parts you get aren't the parts that you are supposed to get.
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Offline combustionmark

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Re: 3.3v led not lit
« Reply #2 on: November 22, 2011, »
Also check board for solder bridges, You may have shorted the 3.3v regulator. May be a bad 3.3V chip or a bad led. Measure the resistance across pins 27, 28 of the pic24 chip, If it is not shorted turn on the express and measure the voltage, if you have 3.3V should be OK. 28 is the +

Good Luck
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