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Wall swith not work

I buy my first wall swith before 10 days. It work awesome until last night. It wake me up.. I hear relay inside going on off on off very fast and after 1 min stop working. Open wall swith and make some measurment of power supply. I find board with WiFi not have 3.3v. I find bad solder in capacitor for this voltage. Fix it and now I have 3.3v to WiFi module but my wall swith is not working. Not led on...
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