Correct program can be uploaded, lcd can not be displayed

I used that same piece of lcd can be displayed with the same program, but this one will not show that there is a problem lcd? Program to ensure correct, lcd I do not know where the problem appears?

My program

#include <Wire.h> // Arduino IDE 內建
// LCD I2C Library,從這裡可以下載:
// https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads
#include <LiquidCrystal_I2C.h>

// Set the pins on the I2C chip used for LCD connections:
// addr, en,rw,rs,d4,d5,d6,d7,bl,blpol
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // 設定 LCD I2C 位址

void setup() {
Serial.begin(115200); // 用於手動輸入文字
lcd.begin(16, 2); // 初始化 LCD,一行 16 的字元,共 2 行,預設開啟背光

// 閃爍三次
for(int i = 0; i < 3; i++) {
lcd.backlight(); // 開啟背光
delay(250);
lcd.noBacklight(); // 關閉背光
delay(250);
}
lcd.backlight();

// 輸出初始化文字
lcd.setCursor(0, 0); // 設定游標位置在第一行行首
lcd.print("Hello, world!");
delay(1000);
lcd.setCursor(0, 1); // 設定游標位置在第二行行首
lcd.print("GTWang.org");
delay(8000);

// 告知使用者可以開始手動輸入訊息
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Use Serial Mon");
lcd.setCursor(0, 1);
lcd.print("Type to display");
}

void loop() {
// 當使用者手動輸入訊息
if (Serial.available()) {
// 等待一小段時間,確認資料都接收下來了
delay(100);
// 清除舊訊息
lcd.clear();
// 讀取新訊息
while (Serial.available() > 0) {
// 將訊息顯示在 LCD 上
lcd.write(Serial.read());
}
}
}

Maybe your display is set to an alternate address

LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // 設定 LCD I2C 位址

Try

LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // 設定 LCD I2C 位址

Instead, after the change to a new problem, I think it may be the back of the LCIC1602 IIC V1 control panel is broken, so I want to buy a new one to get. How to overhaul? Feel the hardware asked!

exit status 1
stray '\357' in program

Broken is always possible but Just checking... You did adjust the contrast? Silly question but it happens.

Really is the problem of contrast, I am really stupid thank you for your help

If there are other people using LCD this paragraph when there are problems you can go to Arduino Playground - I2cScanner
Check the address here, adjust the contrast.

Don't feel stupid. We have all been there. Glad it is working.

Cheers