My Nokia LCD 5110 isn't work (just blue screen from backlight)

i've searched on the internet and i realize there are so many types of this lcd like in sparkfun product https://www.sparkfun.com/products/10168 and Adafruit product http://www.adafruit.com/products/338 . The different is just in the pin configuration. The configuration i followed from sparkfun tutorial (in the web https://learn.sparkfun.com/tutorials/graphic-lcd-hookup-guide/hardware-assembly--hookup it said that the device have to plug in with resistor and i use different value of the resistor but it still same like before then i tried not to connect it with resistor and the result was still same) and also the code. But after that like i said before the BL(backlight) was turning on and the trouble was just in text or in graphic/bitmap. And i think it's not come from the lcd because i've just bought it yesterday

i think the LCD it self is defective, try it on another LCD.. 

Ok, oh is it necessary to connect the lcd with level shifter ic (5v logic to 3.3v logic) ? i still confuse with this ic

These LCD's do work with 5 volt logic so it should not be necessary, watch the video below it has all information u need...

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RE: My Nokia LCD 5110 isn't work (just blue screen from backlight)

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Yes i've watch it, but it's still same, just blue screen

Did this get resolved, or are you still working on it?

i'm still working on sir, and i'll try it to solve this

I to am having this problem using the same LCD Module that you had pictured

After reading this link: How to use a Nokia 5110 84X48 LCD display with your Arduino (It's easy and cheap!) (in the comments section) someone mentioned this displays might be rather picky with their VCC voltage so i tried limiting it with a voltage divider but that didn't work and then i tried limiting the voltage down from the 5v supply but all that did was fry the trim pot i was using.

The only other thing i could think of was that it was a problem with the code which i used from this link https://learn.sparkfun.com/tutorials/graphic-lcd-hookup-guide and i have also tried the Adafruit code using the supplied libraries which still didn't work, finally i tried adjusting the contrast PWM setting and still nothing.

Is it a faulty display ? I brought 3 from ebay and they all have this problem.

synj24

I see from the attached image you are using the 3v3 regulator on the Arduino UNO board.

The 3v3 regulator is capable of 50mA only, but with the backlight on there was this comment from SparkFun.

You might need to do some limiting of the backlight supply ...

Mark

Thanks for the tip!

there is now a 330 ohm resistor in series with the BL(led) pin.

I got this to work in the end by tweaking the bias and contrast settings on the lcd

this tutorial: https://www.youtube.com/playlist?list=PLjzGSu1yGFjXWp5F4BPJg4ZJFbJcWeRzk

and this data sheet: https://www.sparkfun.com/datasheets/LCD/Monochrome/Nokia5110.pdf

helped a lot.

however i think this model of LCD differs slightly from the one shown because the backlight doesn't turn on when pulled low, it probably needs to be controlled via PWM.