Lantern with 3 leds (reverse engineering)

I buy a chinesse lantern with 3 leds who is powered by 2 AA bateries. If power directlly a white led at 2 AA bateries, led will lit very low or not lit, but if it use  PWM style or any impulse, can lit the led.

I made reverse engineering of lantern…

I use a oscilloscope for see the signal on the leds:

and on lab power suply I see the consum little different like with bateries (0,17A on batterise and 0,32A with lab power supply):

I redesigned the schematic using Livewire software:

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