Have questions about FETS, transistors, measurement, power supplies, or anything else electrical?

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By Sani021
#91591 Hi everyone, I'm very new in IOT Industry and I'm trying to find 5v power supply on my ESP8266 wifi module. I believe vin pin is providing 5v power . However for some reason its not working and I don't know whether if the issue is coming from the module I'm using or I'm doing something wrong in terms of coding etc...
FYI when I try to turn on and off the Relay module trough the Blynk app, it turns on but it doesn't execute any sound out Relay which we normally we should hear that little sound. So that makes me think of maybe its not receiving enough power from vin pin which is 5v in this case.
I guess I really need to be clear from vin pin first . So I wonder how can I make sure if the vin pin is faulty or not?
is there any ways to test it without connecting the module to the server to make sure where the issue is coming from?

Thank you everyone.