how to use test 16x2 LCD i2c Display white screen and i2c address problem solution

how to use test 16x2 LCD i2c Display white screen and i2c address problem solution

1. Proper Soldering
2. SCL and SDA proper Connection
3. Correct I2C Address  

Quick Video- https://youtube.com/shorts/RdqAXBWwr90?si=h6HHwJXqWokbDVLB

Full Video- https://youtu.be/vsidQduHQE8?si=mjqEpsGv2u4PnYEE

I2C address Scan code link- https://github.com/futuristiciox/P345._I2C_Address_Scanner_All_Connected_2026_sketch_jan29a

Connection-

I2C address Scan code-

#include <Wire.h>

void setup() {

  Wire.begin();

  Serial.begin(115200);

  while (!Serial); // Wait for Serial Monitor

  Serial.println("\nI2C Scanner");

}

void loop() {

  byte error, address;

  int nDevices = 0;

  Serial.println("Scanning...");

  for (address = 1; address < 127; address++) {

    Wire.beginTransmission(address);

    error = Wire.endTransmission();

    if (error == 0) {

      Serial.print("I2C device found at address 0x");

      if (address < 16) Serial.print("0");

      Serial.println(address, HEX);

      nDevices++;

    } else if (error == 4) {

      Serial.print("Unknown error at address 0x");

      if (address < 16) Serial.print("0");

      Serial.println(address, HEX);

    }

  }

  if (nDevices == 0)

    Serial.println("No I2C devices found\n");

  else

    Serial.println("done\n");

  delay(5000); // Wait 5 seconds before scanning again

}

Example code- 

//YWROBOT

//Compatible with the Arduino IDE 1.0

//Library version:1.1

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()

{

  lcd.init();                      // initialize the lcd

  lcd.init();

  // Print a message to the LCD.

  lcd.backlight();

  lcd.setCursor(3,0);

  lcd.print("Hello, world!");

  lcd.setCursor(2,1);

  lcd.print("Ywrobot Arduino!");

   lcd.setCursor(0,2);

  lcd.print("Arduino LCM IIC 2004");

   lcd.setCursor(2,3);

  lcd.print("Power By Ec-yuan!");

}

void loop()

{

}