Reverse Engineering A Sony Car Stereo LCD

For his own reasons, [Jose Luis Monteiro] (aka [emsyscode]) decided he needed to drive the LCD on a Sony CDX-A250 car stereo’s front panel using an Arduino. There’s probably a …. Reverse Engineering A Sony Car Stereo LCD.

There’s probably a sweet project in the works, or perhaps he just wanted to see if it could be done. Either way, more power to [Jose], because he totally pulled it off and pu t the results up on GitHub for all to enjoy. There’s also a project video showing how he did the reverse-engineering, which you can see below.

The driver for this diminutive LCD is a chip obviously labeled LC75826W, and that’s what the Arduino ends up talking to. Thankfully, there was a datasheet available for that part, which gave [Jose] a great starting point for figuring out how to use it. While [Jose] is working with the LC75826W driver, he’s quite explicit in his GitHub repo that this repository is not a driver library for that chip.

The code only targets the specific LCD on the CDX-A250 head unit.