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Bad LED 
electro-tech-online.com | by ke5frf | Wed, Oct 14
electro-tech-online.com is the #4 Blogger for LED lamp
I concluded it MUST be a bad diode because it was from 5 volt bus to ground bus across all 15 RED LEDs, and the suspect LED was the only one showing an odd voltage (3.1 volts instead of 4)
Knowing that CMOS logic requires a threshold voltage to change states, I figured the CPU wasn't happy with 3.1 v...
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