Positive 16x2 RGB LCD not working, no backlight

[adafruit_support_bill]

To view the board files, you need the Eaglecad package. It is a free download.
http://www.cadsoftusa.com/download-eagle/freeware/

[wallykissel]

Never mind. Downloaded 'EAGLE' to read the schematics.

[tnagy14]

I believe I have traced the problem down to a short somewhere between the SDA and SCL pins. The only active component connected to those pins is the IC. I am planning to buy one from digikey and try it out. In the mean time, is it possible to exchange the LCD with the missing capacitor. Note that I bought this kit through Maker Shed so does it need to be returned to them?
Thanks,

[adafruit_support_bill]

We can replace the display for you. Contact support@adafruit.com with a link to this thread and request a replacement RGB LCD for your shield.

[wallykissel]

@tnagy - The schematics and board files are all here: https://github.com/adafruit/Adafruit-RGB-LCD-shield
btw: What processor are you connecting this to?

@wallykissel - It sounds like an i2c communication problem. I am not familiar with the Funduino, but we have seen problems with some of the clones. If you post photos of the front & back of the board, we can check your assembly.

Post photos of the back? Sounds like a de-soldering challenge. I will borrow a friends stock UNO tomorrow and try the 'Hello World' demo.

- Wally

I'm open for suggestions on how to view the .brd and .sch files. @ https://github.com/adafruit/Adafruit-RGB-LCD-shield

Downloaded 'Eagle' to see the files.

Looks like my problem is the clone. RGB LCD demo works fine with an R3 UNO.

Thanks,
- Wally

[wallykissel]

Found the problem with the I2C communication. Followed the A4 & A5 lines on the LCD shield and the Due many times but never looked back at the ATMega pins. Mystery solved, all is well. (It actually was more like a solder 'splash' as it came loose very easily. None the less, it was shorting the pins.)

[adafruit_support_bill]

Good diagnostic work! Thanks for the follow-up.