floresta:
Unfortunately i've mounted the LCD and it's really difficult to take a back picture.
It would have been prudent for you to have taken pictures before mounting the device.
I do this routinely for most of what I buy now. It's a lot easier to get the model number for a washing machine I bought 6 years ago by looking at my computer rather than by crawling around on the floor with a flashlight and magnifying glass.
Don
You are right floresta , however it doesn't indicate any serial number or version model on the back side, like in the previous LCD.. So even if i posted a back picture it wouldn't help to identify what model it is 
What is amazing about being able to light up an LED by connecting what is essentially a battery with a series resistor to the LED. You have a 50% chance of lighting it up depending upon which way you apply the connections.
Too less current? What is the current and voltage applied through a multimeter when looking for continuity or short circuits?