It is a noob question. I am trying to repair my garden solar lights and they have a small very simple circuit with something that most likely is a voltage booster.
I tested the output produced from the system and it is only 0.5V or so which is obviously too little to power the LEDs. So for me, it looks like the booster is broken. I thought of replacing it but there is not a number on the part. Would you have an idea of what it could be? Picture attached.