Need help identifying component in charging circuit, marked "SKLJJ"

SM devices are often impossible to identify, there seems little or no reasoning behind their labelling - from the look of it I'd suggest it's perhaps a voltage regulator?.

For SM you really need a service manual, that identifies what all the parts are and gives a schematic - but I suspect that's unlikely?.

Next best, would be to check a working unit, and measure the voltages round that device, this will identify if it is actually a voltage regulator, and also what voltage it is, plus the pin connections. You can then try and find one with similar specs.

What i feared, trying to get in contact with anyone else that has this unit, hopefully i can find a solution

Talk to Philips here https://community.philipsprojection.com/c/picopix-max/technical/9 Or modify it to charge at slow CV to 3.8V

Thanks again!
Found that forum also, tried so many times creating an account without luck.


If i don't find anything for a while ill just do as you say and add a external usb c pcb charger to the battery

Fedde said:

Thanks again!
Found that forum also, tried so many times creating an account without luck.


If i don't find anything for a while ill just do as you say and add a external usb c pcb charger to the battery

Click to expand...

Bear in mind, you would need a real 'charger' NOT just a power supply - most so called 'chargers' are just power supplies, and the actual charger is inside the device, and the external supply just provides power for it.

Connecting just a power supply directly to a Li-Ion battery is going to destroy the battery, if it doesn't explode or burst in to flame. It's VERY, VERY dangerous thing to do.

Yes, i am aware, my plan is to either connect a 3s balanced charger that uses usb c, or just take out the battery and use an usb c PD decoy board. I tested by removing the battery and connecting 12v to the battery port, the unit works.
However the best solution would be to fix it the right way, however it seems impossible to know what that component is.