Question about LCD connections

Hi, this is my first using this forum. I’m enjoying the Arduino, but this problem is very frustrating, so I would appreciate any help.
I have looked at many posts related to the problem I am having, i.e. two rows of black boxes when I upload my “hello world” sketch, according to the tutorial. It sounds like this is due to one of the controller pins malfunctioning (pin 4 or pin 6 on the LCD).

I’m using a microtips technology LCD (http://www.microtipsusa.com/pdfs/products/Character/NMTC-S16205DRGHS.pdf), which has a SPLC780C chip.

LCD has two sets of 16 pins. One set on each side, which I believe are connected. I initially soldered ribbon cable to one side, but didn’t connect it to anything. Then to test the LCD I soldered headers onto the other side, and connected them to the arduino.

Do you think the problem is the ribbon cable messing up the connection? It’s not connected to anything on the other side. I am new to soldering, do you think I could have burned up the terminal to which the RS or Enable is connected?

the code I used (suggested by a respondent to another post) is:

#include <LiquidCrystal.h>

LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

void setup()
{
lcd.begin(16, 2);
lcd.print(“hello, world!”);
lcd.setCursor (0,1);
lcd.print(“it works!”);
}

void loop() {}

Thank you for any help possible!!

The soldering to some of those pins doesn't look very good. The solder is supposed to flow around the pin and stick to it. It looks to me like the pin is sticking up through a hole in the middle of the solder.

ya pin connected to 26 looks bad

Thank you, Nick Gammon and Woody_Unreal! I just redid the soldering, and it worked! I had spent hours trying to figure out what was wrong. Now, thanks to your comments, it works. You just made my day :slight_smile:

Here are the new pictures!

Np Were Glad to help :)

A trick to avoid cold solder joint:cold joint looks dull. Good joint looks shiny and bright under proper indoor lighting. If you heat up a cold joint and it gets hot enough be become a good joint, it suddenly becomes shiny :) I'll skip the physics of that.