Problem making P018 RGB 1602 16x2 LCD display text

Hi

I recently bought this LCD PCB kit (i2c version):
http://www.ebay.co.uk/itm/I2C-LCD-IC-kit-for-the-Raspberry-Pi-Arduino-PWM-Backlight-P018-/310760800446

Unfortunately, I cannot get it to display text at all, and the contrast knob doesn't work either. I even tried hooking up the kit to an old Raspberry Pi to no avail either, just to see if it was the software.

This is my first soldering project, so I suspect it is because I've messed something up.

Information on this product is very scarce, and the pages linked to by the seller are pretty much the only available resources:
http://www.pichips.co.uk/index.php/P017_LCD_Chip
http://www.pichips.co.uk/index.php/PO17_LCD_Construction

I've attached some pictures which show my wiring setup, the pcb itself and the result. I had to resize them to post them, so I hope you can see what you need (otherwise I will reupload them). As you can see, only backlight control is possible. I must admit I'm a bit worried about the 4-pin headers, as I seem to have soldered them particularly poorly.

Any ideas?

Thanks

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There are several issues that you must deal with and, as you guessed, your soldering is one of them. Here's a link to some information that should be of help: --> Common Soldering Problems | Adafruit Guide To Excellent Soldering | Adafruit Learning System

Next you have to get the contrast working. With no program running on your Arduino you should be able to adjust the contrast to show a row of 'boxes' on the display.

We also need to see a listing of the actual code that you are using along with a photograph of what you see when that code is running.

Don

Hi

I resoldered everything and now it works. Thanks for the link, it was informative.

nim_