r/electronic_circuits

The battery is fine and fully charged at 4.2 V (red wires: L+ and B-). The LED is at the top (B+ and the blue wire). At the bottom, there is a switch with four modes: the first press turns the LED on at full brightness, the second switches to half brightness, the third activates blinking mode, and the fourth turns the LED off.

To the right of the switch, there are blue and green LEDs that indicate charging status, a full battery, or when the lamp is in use.

It's not visible in the picture, but there is some blue stuff underneath the IC, possibly copper oxidation or some kind of glue. Anyway, the lamp doesn't respond when I press the switch, so I believe the IC was damaged by the rain.

It's a cheap battery powered lamp, but I have some tools and would like to try replacing the IC. The problem is that there are no markings on it, and since I'm not an electronics expert, I can't identify it.

Does anyone recognize this IC?

I would like to build a converter in LTspice for illustration purposes, and then build it as a real circuit. I have a 48 V DC supply, and the current is unknown at the moment. The aim is to produce output voltages of 24 V, 12 V and 5 V. I have made a circuit in LTspice, but I get fA and fV on the secondary side. I believe the issue is the switch, so I would like pointers on why my circuit isn’t working and how I can fix it.

https://we.tl/t-KFQi58WquG25fKwr