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Old 07-12-2019, 07:29 PM   #1 (permalink)
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Default Used HV LiPos and now your Nano S2 is shutting down under load in flight? Read here!

Like a few others on HeliFreak and RCGroups who have used HV LiPo and then encountered issues with in-flight shutdowns, I too ran into this situation after about 25-30 flights with HV LiPos.

I'm not sure why HV LiPos messes with this circuitry, but it seems like after a couple dozen flights with LiHV something goes wrong.

Whether it's a bug in the firmware, or a hardware problem, I'm not sure. But I believe I've found a fix.

On the back of the board there are three R050 (0.05 ohm) shunt resistors in parallel, for an effective resistance of 0.017ohms, which appear to be acting as shunts for measuring current flow through the motors. All you need to do is remove one, and short its two pads together with a tiny bit of wire or solder.

What that does is simply bypass the current sensing. You could also replace one of the R050 (50 milliohm) shunts for something a bit lower like 25 milliohms or a bit lower, which would accomplish the same thing but look a little cleaner.

Regardless of what you use to do it, the end result is the same: the board thinks that less current is flowing than actually is, and what it thinks is flowing should be lower than the limit that is in the firmware, whatever that is.

Sorry for the not-so-great pictures, but you should see what I'm talking about.

I did this mod, and have not had any shut downs since. I even installed a more powerful coreless motor (more info later) and it still does not shut down. So it seems like it worked.
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Old 07-29-2019, 08:22 PM   #2 (permalink)
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Has anyone else tried this???
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Old 07-29-2019, 09:15 PM   #3 (permalink)
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This guy did
https://www.rcgroups.com/forums/show...&postcount=617
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Old 08-03-2019, 01:17 AM   #4 (permalink)
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Remove one and short the other 2 pads. I don’t quite understand what you mean by shorting the other 2 pads. Can you please elaborate. Noob here but I’m already sick of the stock connectors. Thanks on advance
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Old 08-03-2019, 08:09 AM   #5 (permalink)
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You remove one of the resistors and short the 2 pads that it used to be on. Leave the other two resistors as they are. If you're unable to actually remove the resistor, simply putting a bit of solder on top of it should be sufficient.
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Old 08-06-2019, 06:24 PM   #6 (permalink)
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Update:

It seems that this issue is not only happening with HV batteries, it's also occurring for some people who are using even the stock batteries. Same deal, flies fine for 20-30 flights then starts doing it.

looks like Blade botched the board, who's surprised. Oh well - the mod works, so if you are having cutouts, mod away
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https://kc3dprint.com - 3D Printing on Demand and 3D Printed RC Helicopter Upgrades
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Old 08-07-2019, 06:19 AM   #7 (permalink)
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seems very similar to things that happened on my Blade MSR S fixed pitch where it started to have a mind of its own as the board started to go bad. Never could understand ... board was $70 but the entire new helicopter was only $100 RTF. I threw it away
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Old 08-09-2019, 03:33 AM   #8 (permalink)
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The lifetime of the Nano S2 is short. Quality is much lower than the previous excellent models like Nano Cps or Nano Cpx.

I am disappointed from Blade. They put too much electronics into it.
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