Help!! NBv4 boot sound and nothing else

So my NBv4 is making the boot sound but when I try to fire it up it shuts itself off and the boot sound goes again.

First thing to try: charge the battery to full. It sounds like you have an insufficient power problem.

It could also be caused by your main LEDs trying to draw too much current. We'd need to know more about your saber to determine if that's the cause.

RRW tri cree, Pulled everything a part after the (FOC) white resistor which was wired to L2 pad, started smoking. After removing the resistor which I've been told isn't necessary since it will be on for a limited amount of time. Rewired every thing and the above problem started happening. I rewired everything 3 times. trying to figure it out. http://https://imgur.com/a/CwuaW

The root cause ended up being a overheating resistor on my FOC positive wire. I removed it last night and tried to rewire it without it. That caused it not to work properly. This morning I rewired the resistor to the FOC positive. Again it started overheating and melting the heat shrink. I completely removed the positive and negative wires from the tri-cree and and rewired everything without them. Works perfectly. even the slight crackling I was getting out of my speaker is gone.

Sounds like the wattage on your resistor was too low. They shouldn't overheat like that, especially for a FoC LED.

So 3.7 input with the white diode forward 3.15 @ 1000 mA, the I plug it into this calculator it recommends a 1ohm 2 watt.

By the math, you need a minimum 0.55 ohm, 0.55 watt resistor. The 1 ohm, 2 watt is perfectly acceptable. If you're using that resistor and it's getting hot enough to melt heat shrink, you've got some kind of wiring issues going on, possibly a short circuit somewhere.

I think a short was the issue. I was also getting static out of my speaker when I had the FOC led wired up.

sounds like a short either up in LED or on the FOC Pad.