Issue with vv board

[TheZig]

To sum things up I can't get the voltage to go down could it be grounding out somewhere I turn the pot trimmer get 7.4 turn it the opposite way I get 7.4 any ideas?? (all this is going in a altoids can mind you so I you think it may be the body let me know) other issue is when I get it working then assemble it (put connector in its hole) it then stops working. Any thoughts I can be more specific if need be just thought this would be clear enough with out having a whole story behind it


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[Para]

I'd put Kapton Tape on the chipset to insulate/isolate it.

The metal box is acting as a ground with the battery connector. What else in the circuitry is touching the box? That's what I would check

 

[wolfstone5]

That's the only thing that I can come up with as well.

 

[TheZig]

The metal on the switch is touching as well I think that may be grounding it out as well I'll try in again in a few ill start with insulating the inside of the case and then applying the terminals to make sure nothin is grounding there then I'll wrap the board to make sure the bottom isnt grounding out as well as the switch.


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[ruff]

I had a similar problem but mine turned out to be bad connections from the regulator to the board it was soldered to

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[TheZig]

Thank for your ideas as well


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[TheZig]

Ok issue is there but kinda narrowed down I used electrical tape to keep the positives from touching the case but I'm still getting 7.4-8.08v no matter which way I turn the pot no metal other than the negative terminals are touching the case and even they are spaced by hot glue


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[ruff]

stray wire or drip of solder between the pins on the regulator ? or between some of the wires perhaps?

 

[TheZig]

I'll look closely and see what I find. If my center post wire on the connector is wiggly that wouldn't give me the bad readings would it?
Brb with update on the solder and stray wire


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[TheZig]

Checked the regulator with a meter and its working just fine no stray wire or solder. I try reading the connector now and I get nothing I know the center post is loose but it's still in the hole and touching as well as the ground enough to give me some kind of reading. IM GETTING FRUSTRATED!! Lol. One minute it works the next it won't even read. I have two 14500 batts stacked reading 8.10v and I still get either no power tithe connector or can't drop the volts from 7.4 it's never both.


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[ruff]

odd, i had a similar problem, it either showed as .6v to .8v or 6.4v couldnt adjust at all, i then found my + wire to the board had a bad connection fixed that and got constant 6.4v no matter where i turned the pot, lead me to believe that i had screwed up the resistors but then figured what the heck since it may be fubar ill try reseating the chip to the board and add a bit more solder to the points, did that and put the batteries in and tested worked fine reading from 1.2 to 6+, havent had any problems with it since aside from batts needing recharged tis why i have 3 sets in rotation

 

[TheZig]

sounds like i should at least give it a shot ill re seat the connector wires and the regulator and see what happens thanks for your help ruff

 

[ruff]

No problem zig... Hope it helps you out

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[TheZig]

Ok update time. Now it will read 1.4v and sometimes it will show the correct volts for a sec then when I re test it's back to 1.4v I'm just about to give up and just buy an assembled vv box mod


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[TheZig]

Is there a way to test the pot with a meter


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[TheZig]

Ok at one point it wouldn't shut off and was reading 7.4v now I'm getting nothing at all. I give up unless someone has any other ideas (I also removed the regulator and reconnected it and still nothing)


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[ruff]

If it shorted out it may have kicked in the battery protection

Im assuming its a rev 2 board from mv, only thing I can think of if everything is seated good and soldered good would be a bad pot, maybe bad resistor

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[TheZig]

Pot was my second guess the resistors seem fine I didn't burn them or anything I'll remove it and see if I get any power to the connector after that. Good thinking ruff you've been a lot of help


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[ruff]

no problem dunno if you will get any juice without the pot tho

 

[TheZig]

The pot is getting power actually if I test from the power in to the middle prong on the pot it reads 8v I'm just gonna by a vv box assembled lol


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