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- Oct 28, 2019
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I have the same problem. (I hear something I don't want to hear. )
It is the sound of a micro fen inside the controller.
Google search found micro fen's model name. (model name : rfa-1804 5v)
My idea is probably an internal cooling fan for general use inside the computer.
Fortunately, The same micro fan had in South Korea.
It's only about six dollars.
The micro-fan have just arrived and will be repaired today.
I tried the 5V connection, and it made the wind sound. (I can't hear anything else. beep~~~~)

It is the sound of a micro fen inside the controller.
Google search found micro fen's model name. (model name : rfa-1804 5v)
My idea is probably an internal cooling fan for general use inside the computer.
Fortunately, The same micro fan had in South Korea.
It's only about six dollars.
The micro-fan have just arrived and will be repaired today.
I tried the 5V connection, and it made the wind sound. (I can't hear anything else. beep~~~~)

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