Solved: RGB 16x2 LCD -vs- Hello World -- it was the "resistor"!

First off, Hello World leaves a little to be desired. There is no feedback if an error is raised, not even a provision for one, although I haven't searched it's library. He doesn't seem to know a potentiometer/rheostat from a resistor!

Anyhow, I'm stumped. I hooked everything up after testing my board (failing 3 pins) and nothing. If it means anything, I have not attached a "10k resistor" to the LCD VO, because it was completely blank, couldnt use any lightening up.

The package had a footprint on it but no cracks I can see. Not much more than 150psi anyhow...

https://www.amazon.com/Character-Module-16x2-Backlight-Arduino/dp/B004MGPALC/ref=sr_1_3?ie=UTF8&qid=1517547930&sr=8-3&keywords=rgb+lcd

says it's hitachi HD44780

Is there another starter LCD sketch?

Wow . By no means is it new.... here is the other thread. All the talk is on the variable backlight. I got that part down, had to find some transistors but the damn LCD is toast.

http://forum.arduino.cc/index.php?topic=579.0

Fixxed. It was the resistor. I think I'm gonna add a plain resistor once I find out what this pot is at. I thought contrast was digitally controlled. Kind of silly you need a poteniometer. I don't even have a 10k.

mattlogue: Fixxed. It was the resistor. I think I'm gonna add a plain resistor once I find out what this pot is at. I thought contrast was digitally controlled. Kind of silly you need a poteniometer. I don't even have a 10k.

If all else fails "Read the manual" I know a novel idea in the age of instant gratification but I am old school.

Just connect pin#3 (VO) to pin#1 (GND) with a plain piece of wire. This should give a visible display. Replace the 0R (wire) with 470R or 390R resistor. Might give a better contrast.

One manual was chinglish the other called a pot a resistor... I couldn't really trust them. The fact LCDs went from light-dark---then light again did vexx me dearly. I felt at 5V it should be black.