I just know the basic electronics, not an expert in the area :)
When I dismantled a broken LED lamp, I could see the circuit below (section after the rectifier, the DC part). 15 LEDs in series. There are two such lines. If they were just parallel lines I know how the circuit works, but they are inter connected here.
Two of the LEDs in a row were broken, So I thought of adding an equivalent resistor value as I did not have the right LED with me. Then the bulb started blinking when powered. Then instead of resistor I just shorted the position of broken LEDs and now it works.
Can anybody explain me the working of this circuit, especially what happens when the parallel lines are interconnected?