Shelly EM making hissing noise

[Colin]

My Shelly EM have been running for about 2 years prior to it stop working last year. I haven't been bothered to check it out until now. 

The device is making a hissing noise when it is powered up almost like water running through a pipe. P1 and P2 is measuring 10ohm but the device doesn't show up in the app. I've tried resetting it by pressing the reset button for 10 sec.
 

The red light is still showing, and I cannot see anything burnt on the board. Is there any way to know for sure that it is dead?

[thgoebel]

Most likely, an electrolytic capacitor has dried out. A symptom is the noise. This capacitor(s) may be replaced, rendering full functionality…

[Lions Bert]

I have 3x a EM and they have all of them the same problem. Do you have instructions to replace the capacitor(s)?

[thgoebel]

3 electrolytic capacitors are the usual subjects: 2 pc. 4,7μF/400V and one 100μF/16V:

 

(Relay module, terminal block and one capacitor removed.)

The 400V capacitors should not have more than 6mm diameter and not more than 11,5mm length; the 16V capacitor not more than 5mm diameter and 11mm lenght. Do have these parts in stock…

Edited December 25, 2024 by thgoebel

[Lions Bert]

Thanks for your advise; how to order these parts?

[thgoebel]

Please contact me via PM…

[Lions Bert]

How to contact you via PM..? I don't know what you mean with PM.

[thgoebel]

PM means personal message (forum‘s conversation or e-mail)…