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crwdns2944351:0crwdnd2944351:0Oura Ring 3 - Charger Repaircrwdnd2944351:0crwdne2944351:0

crwdns2933797:0Cipriancrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Ciprian

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Oura Ring 3
Type
replacement
Thing
Charger Fuse
Title
Oura Ring 3 Charger Fuse Replacement
Introduction
This guide will help fix the issue with the Oura Ring 3 Charger.
Over time, depending on the charger that you use, either the fuse or one/multiple of the decoupling capacitors that come after the fuse in the circuit.
The charger will exhibit the following behaviour when it is not working anymore:
# The LED light will not turn on. Means the fuse is burnt and needs changing.
# The LED light will have a yellow or orange or red light, depending on the charger output voltage. I noticed that with a 5.2V it was orange, with a 4.9V charger it was yellow. Do note this also results in the main charging chip heating up as the circuit has a short circuit. So I recommend to not keep it plugged it a lot like this, after you've seen the colour, just remove the USB C cable. This means that one of the capacitors is shorted and needs replacing.
The fuse is next to the USB C port. The capacitor that gets burnt varies, but in my experience it is the bigger one (black colour) next to the fuse.
Do note the following:
# Usually both the fuse and the capacitor are burnt, you won't find the capacitor burnt without the fuse.
# If you do not have a 0402 fuse around and do not want to wait/do not care, you can just bridge the 2 contact points on the PCB and it will work the same way.
# To check which capacitor is burnt out, you will need to remove the capacitors 1 by one, and use a multimeter in Diode Mode to check for continuity. You must do this after each capacitor you remove until you see/hear the continuity/short stopped. I recommend starting with the capacitors very close to the USB C port, but those around the chip itself can also be the cause.
A regular soldering station is enough, but a hot air rework station would make it a lot easier and speed up things.
Follow the guide to disasseble the device and reassemble it after.
Time Required Min
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Time Required Max
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Imageid
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Difficulty
Moderate
Conclusion
To reassemble your device, follow these instructions in reverse order.
Author
Ciprian
Public
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  • Soldering Iron x1 added.
  • Multimeter x1 added.
  • Screwdriver Kit x1 added.

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  • 0402 SMD Fuse 2A 32V Fuse x1 As long as they are 0402 other current/voltage will work too. added.
  • Capacitor 0.1uF 0402 SMD x1 Depending on the place, a bigger size than 0402 can be used. added.

crwdns2935255:0crwdne2935255:0

  • In Progress added.
  • Community-Contributed Guide added.

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