Sonoff RF Bridge 433 component

Hardware
1

I have a Sonoff RF Bridge 433 (the first one, the black black one).
It has stopped working and when I looked at the board I found a component named D4 that does not look too good.
I would like to replace it if possible, but I have no idea with what, so I hope there are some wizards into electronics that can give a clue.

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2

1N4148 diode.

Source: File:Sonoff RF Bridge 433 Schematic.SCH.pdf - ITEAD Wiki

And yeah, ‘it don’t look too good’ :rofl:

3

Thanks a lot, NathanCu.
I did not want to give up on my V1 bridges. They are simply better than the R2. :slight_smile:

4

Hmm, it looks like it is just for the buzzer.
I wonder if I can just remove it, since I do not need the buzzer.

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5

Okay, I removed the buzzer and diode, but the end result is the same.
It seems to be working at times, but then suddenly stops.
Either there is a bad soldering, which I can’t find or some other component has died too.

I guess I have to see if the R2 can be used with my remotes.

Thanks for the help.

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