First Build problems

[Itsyaboichody]

I recently bought a DNA 250c and all supporting parts and built my first self built mod. I'm having the check battery error and the board is not reading my batteries at the correct voltage. I've verified them with my charger and have tried two different sets of batteries. Using two Samsung 40t 21700's.

[Wayneo]

Did you follow the datasheet for your wiring? You'd need to use a multimeter at each connection point for each cell to identify what needs to be re-soldered or fixed. Did you solder directly to the board or use the JST connector?

Screenshots for future info.
The Print Screen button on your keyboard can take a screenshot and save it as a file OR use the 'Snipping Tool'
How to Take a Screenshot in Microsoft Windows - https://bit.ly/3bjmx6m
 

[Itsyaboichody]

44 minutes ago, Wayneo said:

Did you follow the datasheet for your wiring? You'd need to use a multimeter at each connection point for each cell to identify what needs to be re-soldered or fixed. Did you solder directly to the board or use the JST connector?

Screenshots for future info.
The Print Screen button on your keyboard can take a screenshot and save it as a file OR use the 'Snipping Tool'
How to Take a Screenshot in Microsoft Windows - https://bit.ly/3bjmx6m
 

I did. The only thing I don't have wired is balanced charging but I'm using removable batteries and don't need it. I've hit it with my multimeter and am getting just shy of 8.4v on the contacts of the board. I'm lost on what path to test after that. I tested my sled and everything is fine to the board and I'm also getting 7v out of the board to my external button. Thank you for the advise.

Edited May 30, 2021 by Itsyaboichody

[Wayneo]

You need to wire the JST, or directly to the board. The board needs to see individual cell voltages for safety reasons, it can't just look at 8.4v and assume only 2 cells.

[dwcraig1]

Here is diagram from data sheet and this is how I did mine. I only used the one wire to #1, jumped the rest using small piece of wire or just solder

[Itsyaboichody]

Thank you, ill give it a try when I get home tonight and post tomorrow. 

[Itsyaboichody]

Thanks so much for the help, my board is reading the batteries and operating just fine except for the screen not working but I'd rather be replacing the screen than thinking the board was doa or I messed something up while soldering. 

[Wayneo]

Great job. On page 10 of the datasheet, it shows screen installation. You know it's in right when you hear/feel a click on the latch.
https://downloads.evolvapor.com/dna250color.pdf

Edit: Now or when you're all done, go show off your handiwork in this thread (you don't have to show the screen, but we all like seeing innards)

https://forum.evolvapor.com/topic/69677-my-dna-250c-build/