Cannot control fcob rgb LED

Issues
1

I have recently tried some project with WLED.
Unfortunately I am not abel to get my fcob rgb LED working.

I am using a 1m LED (576 LEDs/m) and should have 16 addressable elements.
(https://de.aliexpress.com/item/1005006182696754.html?spm=a2g0o.order_list.order_list_main.47.6be25c5flAqV5S&gatewayAdapt=glo2deu)

A 12V 850mA should yield 10W, which is needed for the 1m of LED

As controller I am using a NodeMcu v3 CP2102. GPIO4 is on pin D2 (this seems to work for non-cod leds).
(https://de.aliexpress.com/item/1005006431730734.html?spm=a2g0o.order_list.order_list_main.23.6be25c5flAqV5S&gatewayAdapt=glo2deu)

This is how the setup looks like when I have chosen 1 addressable element and turned POWER OFF.
The second element on the strip is still active.

IMG_20240309_201436
IMG_20240309_2014361920×1920 481 KB

Any suggestions?

Edit:
I have played around a little bit.
For the controller I have choosen a different power supply (2.2 Amps) .
I was able to control everything but the first LED-section, which was always turned off and showing a green color despite the controller having turned the led-stip off.

I then switched to GPI03, which is the RX pin on my board (read it online somewhere).
Now I am able to turn the first led off, however it is still a different color and does not seem to react otherwise.

Edit2: Repowered the board by removing the USB power supply from the outlet.
The first LED stays on now no matter what (green).

2

Sounds like your first set of LEDs may be bad. Also as has been said many times recently regarding the cob strips. Add a level shifter to bring the gpio output up to the required 5v.