Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 So I've had this Tugboat DNA200 for about two months I got it secondhand. I had an issue where my resistance was literally doubling so example my resistance would be .23 and the DNA200 would read it as .36+ sometimes going to .40 with a kanthal fused Clapton build. I fixed that with the internal resistance of the mod in escribe... I have it set to .12 and that gives me a perfect reading however that seems really high and now whenever I press the fire button I can feel the bottom corner of the mod heating up right where the micro USB port is, like it gets hot but cools down rather quickly. It just seems weird to me and want to fix this. Flawless said they could fix my initial problem for $100 and they failed to even mention mod internal resistance and I really don't want to deal with them to be honest. Link to comment Share on other sites More sharing options...
dwcraig1 Posted June 30, 2016 Report Share Posted June 30, 2016 The mod resistance is far from the expected setting. Might have a bad solder joint on the 510. Is the 510 center pin on the mod at normal height, not stuck down? Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 The center pin on the 510 seems good, nice and springy but not overly soft. This mods been a nightmare honestly... I even popped it open and looked at the 510 on my initial problem and it looked fine to me. Note: idk if that is the actual resistance, I tried the normal .007 and it still didn't read or perform correctly, I read on another forum that a guy with the same problem had an IR of .12 and it fixed his problem. I just don't have a calibration tool atm Link to comment Share on other sites More sharing options...
dwcraig1 Posted June 30, 2016 Report Share Posted June 30, 2016 That would amount to a work around fix, if it's acually .12 ohm there is something wrong. Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 Well upon opening up this morning I realized there isn't even a ground wire connected to the board just a positive wire going to the 510 no ground at all Link to comment Share on other sites More sharing options...
BillW50 Posted June 30, 2016 Report Share Posted June 30, 2016 They are using the box as ground. Sometimes that works and sometimes it doesn't. You could loosen the 510 and clean up where the nut grabs the box. Then check the screws on the board. At least one should have a good ground to the box. Or you can add a ground wire to the 510. Link to comment Share on other sites More sharing options...
retird Posted June 30, 2016 Report Share Posted June 30, 2016 Looks like they are using a "case ground build" where the enclosure is the ground path and the 510 gets it's ground from contact with the metal case enclosure... Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 My bottom screw near the up and down buttons heats up as I press the fire button. The mod works great in just a little worried as to why a screw is heating up lol. That must be the ground. Love the box and hate to trash it but the thing is a nightmare. Link to comment Share on other sites More sharing options...
retird Posted June 30, 2016 Report Share Posted June 30, 2016 You might loosen and re-tighten the screws holding the board. The ground travels thru the screw. Also the ground gets to the 510 thru the screws holding the two enclosure cases together. Heating of any screw may indicate poor contact thus poor ground... Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 One of my screws is a little Stripped! And one more question. It looks as if my ribbon to the screen may have been laying right on the fire button I've heard before that's a no no Link to comment Share on other sites More sharing options...
retird Posted June 30, 2016 Report Share Posted June 30, 2016 If you are not having any issue with the screen then the ribbon is probably OK but it should not touch the fire button as it can cause issues with the screen etc. The stripped screw... is it a screw holding the board? Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 No it's actually one of the screws that holds the enclosure together. My board screws are good as I'm the first person to pull those off Link to comment Share on other sites More sharing options...
retird Posted June 30, 2016 Report Share Posted June 30, 2016 OK... from your first post: I fixed that with the internal resistance of the mod in escribe... I have it set to .12 and that gives me a perfect reading however that seems really high and now whenever I press the fire button I can feel the bottom corner of the mod heating up right where the micro USB port is, like it gets hot but cools down rather quickly.How did you arrive at a resistance setting of 0.12? Did you use an atty "tool" to measure internal resistance? Most resistances I see and use are around the 0.004 to 0.006 range...You might consider a ground wire from the board to the 510 also... Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 A ran across a similar problem on a Ecf thread and I plugged the number in and it fixed my issue. I want to actually get that tested today since I'm at my shop. I do not have a tool tho And here is all flawless had to say.. "Unfortunately with the mod being opened you voided the warranty" I figured that much but couldn't answer my initial question or even guide me to someone who could? Maybe even just tech support or cs. Flawless you aren't so flawless Link to comment Share on other sites More sharing options...
VapingBad Posted June 30, 2016 Report Share Posted June 30, 2016 Even a copper or brass bar in the 510 will get you a reasonable mod res measurement 0.12 ohm is way way too high IMO https://forum.evolvapor.com/topic/65594-topic/?do=findComment&comment=886226 . Is that screw taking more of the ground current somehow, maybe there is anodising that is causing the ground path to take the long route. Link to comment Share on other sites More sharing options...
retird Posted June 30, 2016 Report Share Posted June 30, 2016 https://www.youtube.com/watch?v=j_fBo6cIk1M Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 Thanks all for the help it means a lot. So I cleaned every single screw in some takaa vodka and put everything back together and no more hot screw like at all. And now my resistance is cut in half so I think if I can find the mod Internal resistance my problems will be solved. The screws were dirty that held the case together and the screws that held the board on we're a little lookse in my opinion so that issue seems to be fixed. I think that's why the resistance was so off. Shouldn't it be around like .007 Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 I got a internal resistance read of .008 after all the cleaning, the ohm reading is spot on with a USA ohm reader and no more hot screw. Maybe it just needed that deep cleaning and I did a little work with moving the wiring and connections so everything looked cleaner and how it should have been its reading a .27 ohm cool in my tornado tank which is spot on with everything else I own and it seems to be giving the perfect amount of power. Link to comment Share on other sites More sharing options...
retird Posted June 30, 2016 Report Share Posted June 30, 2016 Yep, I think you got-er-done.... that's why I'm not a big fan of "case grounds"... Link to comment Share on other sites More sharing options...
Low.ohms Posted June 30, 2016 Author Report Share Posted June 30, 2016 I think I'm gonna install a ground wire but in the mean time just keep everything clean. I'm a mech guy so I keep my tubes clean, I just thought to clean the screws and all and it worked. Dropped my internal resistance well pretty far down lol. Thank dude! You have a good day I'll report back if I have any problems or guidance on that ground wire Link to comment Share on other sites More sharing options...
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