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Author Topic: NBV3 wont boot  (Read 726 times)

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Offline Andrew Peter

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NBV3 wont boot
« on: March 02, 2018, 09:34:31 AM »
I wired up a NBV3 inside my saber and it wouldnít boot up, I ripped it all out and quickly wired it all up outside the saber, same result. Can anyone see what Iíve done wrong?

I know the soldering is ropey it will all be completely re done once I find the problem.




Offline Andrew Peter

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Re: NBV3 wont boot
« Reply #1 on: March 02, 2018, 10:13:04 AM »
I used this diagram

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Offline erv

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Re: NBV3 wont boot
« Reply #2 on: March 02, 2018, 10:46:55 AM »
I don't see any speaker wired to the board.
I would also bypass the switch and use only two wires to see if the board starts.

Offline Andrew Peter

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Re: NBV3 wont boot
« Reply #3 on: March 02, 2018, 10:52:47 AM »
Yeah I didnít wire the speaker on the 2nd time, is it needed for it to boot?

Iíll wire the speaker on either way and try the switch wires thanks for the help Iíll let you know how it goes.

Offline Andrew Peter

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Re: NBV3 wont boot
« Reply #4 on: March 03, 2018, 01:10:23 AM »
I don't see any speaker wired to the board.
I would also bypass the switch and use only two wires to see if the board starts.

I've now wired the speaker and removed the switch, touching the 2 wires does nothing, still no life.

The accent LED isn't lighting up either which I've also wired up to the 3.3v

What else can I try? do you need any more photos?

Offline erv

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Re: NBV3 wont boot
« Reply #5 on: March 03, 2018, 03:12:12 AM »
If you don't have the 3.3 volt then the board is not getting power or the regulator is fried. First check voltages on the board input and on the 3.3 volt manually with a dmm.

Offline Doaln

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Re: NBV3 wont boot
« Reply #6 on: March 03, 2018, 01:37:09 PM »
Just for the sake of ruling everything out; can you test with another battery? Preferably one that you know is charged up and works.

Offline Andrew Peter

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Re: NBV3 wont boot
« Reply #7 on: March 03, 2018, 02:20:31 PM »
Just for the sake of ruling everything out; can you test with another battery? Preferably one that you know is charged up and works.

I donít have one but I did try touching the LED wires to the battery and nothing happened, maybe the battery is dead, I left it charging for about 2 hours, unless my recharge port wiring is incorrect?


Offline Doaln

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Re: NBV3 wont boot
« Reply #8 on: March 03, 2018, 07:34:00 PM »
If your battery can't power even the LED, then you're not getting enough (or any juice). If you're in a pinch for a 18650 Li-On battery, I'm told you can visit a Tobacco or Vape store for one because it is popular in vapes. Make sure you get a protected battery!!

Offline Andrew Peter

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Re: NBV3 wont boot
« Reply #9 on: March 04, 2018, 09:56:49 AM »
left the battery charging all day and its now powering the LED's, im getting an indication of 3.5V from a DMM on the battery. I've rewired the board minus the recharge port and its still dead, though i am getting faint crackles from the speaker now.

which pads should I hold the DMM to on the board?

Offline erv

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Re: NBV3 wont boot
« Reply #10 on: March 04, 2018, 10:10:17 AM »
Power supply pads of the board and also 3.3v pad.
To be noted that 3.5 volts is definitely not a charged battery

Offline Andrew Peter

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Re: NBV3 wont boot
« Reply #11 on: March 04, 2018, 01:48:53 PM »
I obviously did something wrong, Iíve wired up just the recharge port to the battery and plugged it in, this time the light on the charger went red instead of off. Iíve noticed that if I wiggle the positive wire it seems to stop charging/start charging like itís a loose connection, but thereís plenty of solder there and itís solid on the + pad. Iíve also noticed if I put the red lead of the DMM on the + pad of the battery the reading is inconsistent/drops, thereís 2 tiny holes at the base of the + pad, if I stick the probe in there the reading is solid. Should I wore the positive wire into one of the holes or try again on top?

After charging, the battery is now at 3.8V is that it charged? Itís a 3.7V battery apparently.

Iíll try the board again tomorrow and see if Iíve fried it during all this...

Offline erv

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Re: NBV3 wont boot
« Reply #12 on: March 04, 2018, 09:16:54 PM »
your RP is probably the issue. A 3.7V battery fully charged reads around 4.2V.

Offline Andrew Peter

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Re: NBV3 wont boot
« Reply #13 on: March 17, 2018, 08:30:20 AM »
Quick update, Iíve now wired up a new battery minus the recharge port and the board fires up and is completely fine.

Next step is to wire up the RP with the new battery to see if thatís broken.

Offline erv

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Re: NBV3 wont boot
« Reply #14 on: March 17, 2018, 08:37:14 AM »
good diag and happy to hear my hypothesis was right