I2C lcd backlight flickering on Arduino Yún

[blascone]

I am having issues running the i2c lcd example on my Arduino Yùn. (https://cylonjs.com/documentation/drivers/lcd/)
I have a SunFounder I2C LCD1602. I am using OpenWrt. I setup everything on the Yún following the instructions on the CylonJs website.
I am guessing the problem is with the cylon I2C driver library since other Cylon js examples work fine.
Problem:
When I do the wiring of the example, the backlight of the lcd is bright and stable but when I start the script the text shows fine but the backlight starts to flicker. I tried both with and without the 4.7k resistors even though they shouldn't be necessary since the arduino has integrated pull-up resistors.

Any help would be really appreciated!! Thanks