Totally unaware of these devices I had a broken solar light that had a good battery and good LEDs. The switch was alright but it didn't switch on. To buy a new LED driver IC is just too expensive (€0,39 + €6,95 for postage). Luckily I had another solar light with a bad battery and salvaged parts to repair our broken light. It was a matter of exchange the IC and the coil.
More inside info can be found here:
https://artists.scitoys.com/three_volts
If you click on the picture on the right you will have a larger one. The parts that I've exchanged are just near the second LED at the right.
We love solar lights in our garden!
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