# Lcd 2004A Show nothing with I2C **URL:** \ **Category:** Displays\ **Created:** [April 28, 2024, 11:25pm UTC](https://forum.arduino.cc/t/lcd-2004a-show-nothing-with-i2c/1253385 "2024-04-28T23:25:02Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![groundFungus](https://avatars.discourse-cdn.com/v4/letter/g/73ab20/32.png) [@groundFungus](https://forum.arduino.cc/u/groundFungus)\ **Post date:** [April 28, 2024, 11:40pm UTC](https://forum.arduino.cc/t/lcd-2004a-show-nothing-with-i2c/1253385/2 "2024-04-28T23:40:46Z")
You could try address0x3f. Better yet, install and use [the hd44780 library.](https://github.com/duinoWitchery/hd44780) The library is available to install through the IDE library manager. The library will automatically determine the I2C address and backpack to LCD pin mapping. If you have trouble, [there is a diagnostic.](https://github.com/duinoWitchery/hd44780/tree/master/examples/ioClass/hd44780_I2Cexp/I2CexpDiag) There is[lots of documentation.](https://github.com/duinoWitchery/hd44780/tree/master/examples/Documentation) Read the how to get the best from the forum to see how to properly post code. > [@How to get the best out of this forum](https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum/679966): > > See also [FAQ - Arduino Forum](https://forum.arduino.cc/faq) for general rules on forum behavior and etiquette. Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. Please read and follow the instructions below. Being new here you might think this is having rules for the sake of rules, but that is not the case. If you don’t follow the guidelines all that happens is there is a long exchange of posts while we try to get you to tell us what we need in order to help you, which is frus… --- _[View the full topic](https://forum.arduino.cc/t/lcd-2004a-show-nothing-with-i2c/1253385)._