Nintendo Switch Oled - Joy con charging

[tommy97]

Hi everyone,

I'm having an issue with a Nintendo Switch OLED that suffered liquid damage. After a full cleanup and replacing the Joy-Con rails and joysticks, everything was working fine for about a week. However, now the Joy-Cons won't charge or connect again.

I tested with a second set of Joy-Cons, and the issue persists. Measuring the voltage on the connector shows 3.7V instead of 5V, which I believe should be the correct value.

Any insights or suggestions on what could be causing this?

[tommy97]

Any ideas?

[Unspun01]

Nominal voltage of most lithium-ion or li-po batteries is 3.6-3.7V, so you would definitely need a voltage larger than that to charge your batteries. Almost every lithium ion rechargeable device we use, which charges from a regular USB cable uses 5V to charge a 3.6-3.7V battery. I think you are correct that the voltage is too low.

I suspect there is more corrosion that you have not seen or located. Go over all affected areas with good magnifying lens. Use isopropyl alcohol. Use 99%, not 70% grade or 50% grade because those lesser percentage ones have too mush water in them to be useful.

Also, double check that you are not missing any surface mount caps or resistors that may have come off or been damaged due to water damage.

Do you have any photos? maybe someone will spot something out of the ordinary.