Nokia 5110 backlight

[scott216]

I just got the Nokia 5110 display. I do not have anything connected to the LED pin, but the 4 backlight LEDs still come on. I tried connecting the LED pin to +3.3 volts and it didn't change the brightness, so it seems they are fully on. Shouldn't these LEDs be off if the LED pin is unconnected?

[adafruit_support_rick]

Please post clear, detailed photos showing your soldering. Maybe you have a short.

[scott216]

I attached pictures

[adafruit_support_rick]

That all looks OK. Unfortunately, I don't have one of these, and I don't know whether or not this is expected behavior. I've asked if somebody else knows.

[adafruit]

its controlled by a mosfet IIRC, tie it to ground if you dont want the backlight on.

[scott216]

Thanks. That explains it.