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Histórico da introdução: Oura Ring 3 - Charger Repair

Edição por Ciprian —

Edição aprovada por Ciprian

Antes
Depois
Sem alteração
dispositivo
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
30 minutos
Time Required Max
30 minutos
Imageid
Antes
Depois
Difficulty
Moderate
Conclusion
To reassemble your device, follow these instructions in reverse order.
Author
Ciprian
Public
Não

Ferramentas

  • Soldering Iron x1 adicionado.
  • Multimeter x1 adicionado.
  • Screwdriver Kit x1 adicionado.

Peças

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

Sinalizadores

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

Passos

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