I’m making a pH sensor program/machine. This is my code but my LCD display is merely lighting up. It’s not displaying anything when I run it but my serial monitor displays the pH levels just fine.

#include <LiquidCrystal.h> 
#define SensorPin 0          // the pH meter Analog output is connected with the Arduino’s Analog
unsigned long int avgValue;  //Store the average value of the sensor feedback
float b;
int buf[10],temp;

LiquidCrystal lcd(2, 3, 4, 5, 6, 7); 

void setup()
{
  pinMode(13,OUTPUT);  
  Serial.begin(9600);  
  Serial.println("Ready");    //Test the serial monitor
  lcd.begin(16, 2);
}
void loop()
{
  for(int i=0;i<10;i++)       //Get 10 sample value from the sensor for smooth the value
  { 
    buf[i]=analogRead(SensorPin);
    delay(10);
  }
  for(int i=0;i<9;i++)        //sort the analog from small to large
  {
    for(int j=i+1;j<10;j++)
    {
      if(buf[i]>buf[j])
      {
        temp=buf[i];
        buf[i]=buf[j];
        buf[j]=temp;
      }
    }
  }
  avgValue=0;
  for(int i=2;i<8;i++)                      //take the average value of 6 center sample
    avgValue+=buf[i];
  float phValue=(float)avgValue*5.0/1024/6; //convert the analog into millivolt
  phValue=3.5*phValue;                      //convert the millivolt into pH value

  Serial.print("    pH:");  
  Serial.print(phValue,2);
  Serial.println(" ");
  digitalWrite(13, HIGH);       
  delay(800);
  digitalWrite(13, LOW);
  lcd.print(phValue,2);

}

I tried placing the lcd.print all around the code already. Only the serial monitor values are showing up, but not even in the LCD Display itself.