Does the Node MCU v3 (LoLin) not have a builtin led? Trying a simple led blinking program I could not get the builtin led on a LoLin Node MCU v3 working. The LED_BUILTIN constant is set to pin 16 / GPIO16 / D0.

Reading several articles and QA I think that the Node MCU boards are supposed to have a the on-board led on pin 16. However, if I address this port nothing happens.

With the same code I can blink the data led which is on a RX pin, pin 2.

Is the builtin led missing on the LoLin Node MCU v3, or could it be that the led on my board is broken?
the ESP8266 has a builtin led that is attached to D4 as labeled on LoLin boards which maps to GPIO2. One thing to Note is that the led is active low. In other words ... setting PIN 2 to '0' will turn the LED ON and setting PIN 2 to '1' will turn the LED OFF

Lolin Builtin_Led Picture

This is the only LED on the LoLin boards and differs from other devkits that have an LED on GPIO16.