My switch Lite volume Up button doesn't work after installation of SX LITE

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Noob Account
Jun 10, 2020
3
1
Korea
I have installed 2 SX LITE on my 2 switch Lite.
it seems working perfectly. however I found that the volume up button of both of them not working.

I checked the soldering point and all points are OK according to the TX installation menu.

is there anyone may know what have I missed or the reason of this "volume up button not working" issue?

thanks.