Nice!nanov2 not getting power from battery | ZMK | Page 1

earnest ravine May 31, 2024, 1:29 PM

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Hi, I recently built a Boardsource Lily58 with nice!nanov2's and am having issues with battery power. The right half works as expected, but no matter what I try, the left half will not get power from the battery. See attached photos (obviously battery isn't currently attached, but I tried to solder/resolder it about 3 times with no effect). I've tried:

Swap out the battery - both batteries work on right side
Use different JST connector - no effect (confirmed polarity was correct)
Resolder left side pcb and nice!nano's - no effect, joints look fine compared to right side
Make sure external power is on in firmware &ext_power EP_ON - no effect

I'm not sure what else to try. At this point, I'm wondering if it's an issue with the nice!nano itself. Any tips or help would be appreciated!

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Photos are of the left half. Wired photo is the right (working) half for reference.

wet idol Jun 1, 2024, 1:22 AM

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Do you have a multimeter? If so, I'd start by checking the battery voltage and confirming connections with the connectivity tester

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That being said, nothing looks off to me

earnest ravine Jun 1, 2024, 11:23 AM

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I don’t, but I figured I’d need one sooner or later. So you think check all the connections along the path to see what’s actually getting voltage?

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On a side note, I’ve been using your keymap drawer for my config and it’s been great! Thanks for your work!

wet idol Jun 1, 2024, 4:34 PM

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Yes, it is very useful to have (and cheap)

wet idol Jun 1, 2024, 4:34 PM

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earnest ravine On a side note, I’ve been using your keymap drawer for my config and it’s been g...

Glad you like it 😊

earnest ravine Jun 1, 2024, 4:43 PM

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I'll give that a try first and see if there's an issue anywhere. Do you know if it could be the microcontroller somehow? I don't know much, but it seems unlikely that it would otherwise work normally other than receiving external power.

wet idol Jun 1, 2024, 6:05 PM

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Perhaps, the charger circuit might be broken. It can happen if you connected the battery with reverse polarity, for instance

earnest ravine Jun 7, 2024, 2:16 PM

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I'm not reading any voltage both with USB connected or with the battery. I assume this meants the charger circuit is broken?

wet idol Jun 7, 2024, 4:22 PM

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Try measuring with the 2000m selected instead. But if it reads 0v still, either the battery is dead or your battery connector has an issue

earnest ravine Jun 7, 2024, 7:46 PM

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At 2000m it maybe briefly showed 1 for a few seconds, but mostly nothing.

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The battery is fine because it works on the other half, so maybe it's the connector. Although I did try a different connector (confirmed correct polarity) and it didn't work either.

wet idol Jun 7, 2024, 9:01 PM

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If you measure the other battery in a similar way can you observe appropriate voltages?

earnest ravine Jun 8, 2024, 2:48 PM

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Yep the other side measures just fine

wet idol Jun 8, 2024, 6:32 PM

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That still makes me suspect the battery, but something seems inconsistent

acoustic pike Jun 9, 2024, 8:54 AM

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So you are not getting a voltage on the raw pin when usb connected? Have you tried to measure when the mcu board is not connected to the PCB?

earnest ravine Jun 14, 2024, 1:24 PM

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I'm getting no voltage both on and off of the PCB. I've measured with all combinations of battery only/usb/both, both when mounted and not mounted on the PCB and get nothing.

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Could I solder to any of the other raw/gnd pins that aren't those two specific to the battery?

wet idol Jun 14, 2024, 4:14 PM

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There are only two RAW, but you can try, sure. They are all internally connected

earnest ravine Jun 14, 2024, 6:10 PM

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I guess I'm wondering, could there be something wrong with just the two raw/gnd that I'm using that soldering directly to the other raw/gnd pins would bypass? Sorry, I just don't know enough about these MCUs to know. I'm just figuring, if the USB is powering it then surely there's a good charging circuit I can solder to.

wet idol Jun 14, 2024, 6:15 PM

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The B+ pin and RAW pin are internally connected to each other -- same with B- and GND pins

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So I doubt it will make a difference

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Perhaps the charging circuit of your controller is dead, which means the battery power wouldn't work but you can still use it over USB

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This can happen if you connect batteries with reverse polarity, for instance

earnest ravine Jun 14, 2024, 6:16 PM

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Ah I see. Yeah, based on what I've tried I'm thinking that may be the case.

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I'll get around to buying a new MCU one day, at least the right half can be used wirelessly.

#Nice!nanov2 not getting power from battery