LMM Posted December 6, 2023 Report Share Posted December 6, 2023 Hello, I've bought a used DNA250 mod without Lipo battery, after my previous one stops working. I have this problem, the 3rd battery shows a crazy voltage that goes up and down while monitoring, even if the battery has been charged with an external charger. With te battery set to 3s the mod doesn't charge tjhe battery and shows a 0% battery charge. The only way to make it work is to set the battery to 2s, this way the battery can be charged and the mod works. The External battery charger works because at the end of the charge i have a stable 12,6V measured with a multimeter so the 3 elements are good. If i put the battery inside the mod i have the issues i described. The problems occurs with two different batteries, so i assume some board failure or bad settings since the previous mod works perfectly with one of the two battery tested. Hope everithing is clear....i'm italian. waiting for some help Link to comment Share on other sites More sharing options...
BillW50 Posted December 6, 2023 Report Share Posted December 6, 2023 (edited) Does the lipo balance plug plugs directly into the board? And this is a 3 cell lipo and not a 4 cell right? Also check with EScribe software and check whether it is set for the correct cell lipo. If you don't know where it is in EScribe, just ask. Edited December 6, 2023 by BillW50 Link to comment Share on other sites More sharing options...
LMM Posted December 6, 2023 Author Report Share Posted December 6, 2023 (edited) Hi Bill, Lipo balance plug is connected to the board, the battery is set to Lithyum Polimer 3s with the correct parameters. It's a 3 cells battery, Fun Fly 1300mah 3s 100c 14,43wh 11.1V Same settings used in my previous DNA250 mod that worked perfectly until it failed. Edited December 6, 2023 by LMM Link to comment Share on other sites More sharing options...
BillW50 Posted December 6, 2023 Report Share Posted December 6, 2023 Yes it looks like the battery chip on the DNA250C board is bad. Maybe someone else might have something else to add. Link to comment Share on other sites More sharing options...
Wayneo Posted December 6, 2023 Report Share Posted December 6, 2023 You could use a multimeter at the back of the jst connector to measure each cells voltage and the total pack voltage 2 Link to comment Share on other sites More sharing options...
dwcraig1 Posted December 6, 2023 Report Share Posted December 6, 2023 Measure the main power leads too while your at it. (on the board) Link to comment Share on other sites More sharing options...
LMM Posted December 6, 2023 Author Report Share Posted December 6, 2023 (edited) 12,50V - 99% charge (2cells set) Battery should not be the problem, unfortunately... Edited December 6, 2023 by LMM Link to comment Share on other sites More sharing options...
dwcraig1 Posted December 6, 2023 Report Share Posted December 6, 2023 Can you measure the main power to the board with a meter while firing. Is the a plug on the main power leads? Link to comment Share on other sites More sharing options...
LMM Posted December 6, 2023 Author Report Share Posted December 6, 2023 (edited) 12.25V Firing a double fralien 0.11Ohm 40W Edited December 6, 2023 by LMM Link to comment Share on other sites More sharing options...
LMM Posted December 6, 2023 Author Report Share Posted December 6, 2023 1 ora fa, dwcraig1 ha scritto: Can you measure the main power to the board with a meter while firing. Is the a plug on the main power leads? What do ou mean exactly with A plug? Link to comment Share on other sites More sharing options...
BillW50 Posted December 6, 2023 Report Share Posted December 6, 2023 (edited) dwcraig1 wants you to measure the battery voltage on the DNA250C board side while it is firing. Edited December 6, 2023 by BillW50 Link to comment Share on other sites More sharing options...
BillW50 Posted December 6, 2023 Report Share Posted December 6, 2023 Let's see if I have this correct. You had a previous DNA250C mod with a 3 cell lipo that was doing this. Now you have another DNA250C mod that is also doing the same. And you have two lipos that were doing the same thing on both mods. Is this right? Link to comment Share on other sites More sharing options...
LMM Posted December 6, 2023 Author Report Share Posted December 6, 2023 Thanks Bill but i've understood! Infact i put the ground on the black cable soldering on the board, the positive on the red cable soldering and then i push the box on the table to fire. I don't know what he means with A plug so i upload the picture to show the connections. Clear enough? Link to comment Share on other sites More sharing options...
BillW50 Posted December 6, 2023 Report Share Posted December 6, 2023 He is referring to that red plug. 1 Link to comment Share on other sites More sharing options...
LMM Posted December 6, 2023 Author Report Share Posted December 6, 2023 3 minuti fa, BillW50 ha scritto: Let's see if I have this correct. You had a previous DNA250C mod with a 3 cell lipo that was doing this. Now you have another DNA250C mod that is also doing the same. And you have two lipos that were doing the same thing on both mods. Is this right? I had a DNA 250 With the 3 cells lipo you see in that picture and it was working correctly. Than it shuts off while i was vaping in my car for no reason, and don't turn on again. Fried circuit. I have bought another one, without battery, i plug my battery and the behaviour it's shown in the screen i've uploaded some posts before. I have another battery, brand new, never used and i tried that one too, same behaviour. Basically if i set 3 cells Lithium Polymer battery, the third cell goes crazy as shown in the escribe graphs, i'm unable to charge the battery with the cable, the charge indicator shows 0% constantly, if i set 2 cells everything works correctly. Link to comment Share on other sites More sharing options...
BillW50 Posted December 6, 2023 Report Share Posted December 6, 2023 Ah... well the battery voltage (also known as the pack voltage) with EScribe is showing 12.19v. Cells 1 and 2 are showing 4.18v. And cell 3 is showing 3.84v (also jumping around). And when you add 4.18 + 4.18 + 3.84 it equals 12.2v. All this adds up just right. If these readings are indeed correct, the DNA250C is in balance charging mode to raise the cell 3 up to 4.18v. This will take the DNA250C like more than 24 hours to finish for being 0.4v off. It will look like the mod isn't charging since the current is very low during balance charging mode. And please set it to 3 cell or it won't fix it. There are more things I want to cover like the cell 3 jumping around and external charging. But more on that later. Link to comment Share on other sites More sharing options...
BillW50 Posted December 6, 2023 Report Share Posted December 6, 2023 That cell 3 jumping around could be a serious problem with external charging and with the DNA250C balance charging. It is most likely dirt or something on the balance plug most likely the pin next to the red wire or the one that is the red wire. Those two are the cell 3 voltage. Either the battery plug or on the board side has the problem. 1 Link to comment Share on other sites More sharing options...
LMM Posted December 7, 2023 Author Report Share Posted December 7, 2023 Ok, i'm trying a USB charging recovery to see what happens... Anyway, i ask you this, the external charger uses the balance connector, and at the end of the process the battery is 12.60V with no fluctuations. So the three cells are 4.2V and it means that the charger works; so why the board recognize the battery as imbalanced? The previous mod (DNA 250 as well) did recognize the battery perfectly balanced and with no issues. Thank you for your time Link to comment Share on other sites More sharing options...
dwcraig1 Posted December 7, 2023 Report Share Posted December 7, 2023 Take a good look at where the pins from the JST connector are soldered to the board,perhaps just go ahead and re-solder them. 3 Link to comment Share on other sites More sharing options...
LMM Posted December 7, 2023 Author Report Share Posted December 7, 2023 (edited) My compliments dwcraig1... look at this mess... removed the board 10 seconds ago...i hope resoldering will solve the issue. Edited December 7, 2023 by LMM 1 Link to comment Share on other sites More sharing options...
LMM Posted December 7, 2023 Author Report Share Posted December 7, 2023 Il 6/12/2023 in 22:16 , BillW50 ha scritto: That cell 3 jumping around could be a serious problem with external charging and with the DNA250C balance charging. It is most likely dirt or something on the balance plug most likely the pin next to the red wire or the one that is the red wire. Those two are the cell 3 voltage. Either the battery plug or on the board side has the problem. The one with the worst soldering... 2 Link to comment Share on other sites More sharing options...
dwcraig1 Posted December 8, 2023 Report Share Posted December 8, 2023 Yes, #3 looks like the one. 1 Link to comment Share on other sites More sharing options...
BillW50 Posted December 8, 2023 Report Share Posted December 8, 2023 11 hours ago, LMM said: The one with the worst soldering... The pad came loose and the solder has cracked. There's your cell 3 voltage jumping around. Link to comment Share on other sites More sharing options...
LMM Posted December 8, 2023 Author Report Share Posted December 8, 2023 2 ore fa, BillW50 ha scritto: The pad came loose and the solder has cracked. There's your cell 3 voltage jumping around. Unfortunately seems that soldering again all the pins don't solve the problem, i'm going to check again. Anyway, the box was opened and a fixing attempt was done by someone else since the yellow protective plastic film and a screw were missing. At this point the real problem could be the charge chip, i've read that a malfunctioning is a "common" issue. I'll keep you updated. Link to comment Share on other sites More sharing options...
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