Hi all! And thanks in advance for your help.
I have this PCB that i'm trying to fix. Is part of a hygrostat device.

I'm looking for ID of two diodes D2 and D3 in the photos.
Also i can't find any datasheet or useful info about the PCB to help me understand which component is failing.
Thanks.

 

Your Thermostat was not made to be repaired. Many parts now days do not have information on them, as you can see.

 

How have you determined that the diodes are defective?

 

4148 is a random guess but a good work horse
https://www.mouser.ee/datasheet/2/308/LL4148-1124993.pdf
https://usermanual.wiki/Document/ll41482Cll4448vishay.995042175/view
? visual ?

 

How have you determined that the diodes are defective?

No. They are testing as 3v3 and 5v6 as Uz
But i'm not sure that value is the working one

the device seems to work for all but switching on the relay when it has to do.
So i was guessing could be a problem close to the relay.
Already changed the battery and the relay.
Now i'm looking around.
Also i found an old post on a polish forum where a guy showed a similar problem with the same device (those diodes probably involved).

Thanks

4148 is a random guess but a good work horse
https://www.mouser.ee/datasheet/2/308/LL4148-1124993.pdf
https://usermanual.wiki/Document/ll41482Cll4448vishay.995042175/view
? visual ?

Thanks yes. i was thinking LL34

Already changed the battery and the relay.
Now i'm looking around.
Also i found an old post on a polish forum where a guy showed a similar problem with the same device (those diodes probably involved).

Also the battery seems not to recharge even the new one