liquid crystal library stopping timer from working

Projects Programming
1

hi! here i have a code to set the timer 2 for phase correct pwm. i am trying to make a temperature controlled fan circuit. So whenever the temperature increases, duty cycle of timer pin increases and fan speeds up. i want an I2C lcd here to display certain things. but when i use the liquid crystal library in the code, fan( timer pin as well) stops working. here is the code :

#include <Wire.h>

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,2,1,0,4,5,6,7,3,POSITIVE);  

int temp;

void setup() {
pinMode(11,OUTPUT);  // put your setup code here, to run once:
TCCR2A = 0;
TCCR2B = 0;
TCNT2 = 0;
TCCR2A = B10100001 ;
TIMSK2 |= (1<<OCIE2B) ;
OCR2B = 0 ;             // for interrupt
TCCR2B = B00000001 ;
sei();
}

void loop() {
  temp = analogRead(A4)*0.512;
 if( temp > 70)
 OCR2A = 255 ;
else if(temp< 70 && temp>60)
 OCR2A = 200 ; 
else if(temp<60 && temp>40)
 OCR2A = 150 ;
else if(temp<40 && temp>30)
 OCR2A = 100;
else if(temp < 30)
 OCR2A = 50 ;  // put your main code here, to run repeatedly:

}

please help me to get this work.

2 
temp = analogRead(A4)*0.512;

A4 is the SDA pin on the i2c bus. You can't use it as analog input.

3

And, as I pointed out in Your Other Post, you need to establish whether or not the LCD library you're using need to use any of the timers you're commandeering for your code (either directly or indirectly).

4

Well i changed the analogread from A4 to A6. It still does not work.