The WS2812B LED is permanently lit in white. Why?

Question

Arduino

There is a garland of three segments of 50 LEDs. Foolishly, the polarity was accidentally reversed, turned on a couple of times, there was a short circuit. Then, having corrected the polarity, he turned on the garland. But the first LED in the first strip and the first LED in the second strip are now permanently lit white. In this case, the signal is passed through itself. And they glow only when there is a digital signal in the line. If you just turn on the power, but the controller is turned off, then they do not light up.
Well, I thought I burned them already. But no! The first LED of the first segment was reanimated by simply unsoldering it from the wires and soldering it back. He began to work normally. But it didn’t work out with the second one (((. I’m not sure that it’s the soldered contacts. Normally they are soldered.

Why did the first LED come to life? What could have happened to him? And how to revive the second?

Answer 1

In short, I ordered spare LEDs from Ali. By the way, the LED, which we managed to revive, still works buggy. Colors sometimes play tricks on it.

Answer 2

esp8266?
rollback from 3.x kernel to previous or change to dma