Mpu 6050 isn't recognized

Hi all,
i'm using a "CH340G ATmega328 Nano V3.0 Mini USB 16M 5V Micro-controller board For Arduino" (copied the name from the site where i bought it) and i'm trying to connect it with a MPU-6050 (GY-521) but the i2c scanner and some sketches for calibrate it can't find it.
In this moment is connected in this way:
Vcc -> 3.3
Gnd -> Gnd
Scl -> A5
Sda -> A4
Int -> D2

i'm following this tutorial MPU6050 First steps - YouTube
when i upload the sketch and open the serial monitor it just say:
"Initializing I2C devices...
Testing device connections...
MPU6050 connection failed"

Few says ago it worked, but i don't remember how i managed to do it.
Is it possible i broke it in some way?
Any ideas?

EDIT: I don't know why but now it works.

Sorry for the bad english, but it isn't my mother tongue, i'm italian :sob: