Fixing a faulty rechargeable UV curing light.

This is the rechargeable variation of the USB powered ultraviolet lacquer/glue curing and exposing light. It arrived defective with the charging circuitry for the internal cell seemingly intact, but no operation of the output.
The unit is quite a functional device (now I've repaired it), but the switching system is a design weakness. A simple button would have been more useful. I guess maybe the main market of nail varnish curing means that a simple press on the top is a preferred way of activation.
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