Reverse Engineering A Sony Car Stereo LCD
Jose Luis Monteiro successfully reverse-engineered the LCD display of a Sony CDX-A250 car stereo to control it using an Arduino. The project utilized the LC75826W driver chip, for which a datasheet was available to guide the development process. The resulting code has been published on GitHub under an MIT license for community use.
- ▪Jose Luis Monteiro used an Arduino to drive the LCD on a Sony CDX-A250 car stereo.
- ▪The specific driver chip for the display is identified as the LC75826W.
- ▪A datasheet for the LC75826W chip was available and served as a starting point for the reverse engineering.
- ▪The project code is hosted on GitHub and is released under an MIT license.
- ▪The repository is specific to the CDX-A250 head unit rather than being a general driver library for the chip.
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| Original publisher | Hackaday |
| Canonical URL | https://hackaday.com/2026/09/20/reverse-engineering-a-sony-car-stereo-lcd/ |
| Publication time | Sun, 20 Sep 2026 14:00:56 +0000 |
| Retrieval time | 2026-09-20T14:03:47.832Z |
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Opening excerpt (first ~120 words) tap to expand
Reverse Engineering A Sony Car Stereo LCD No comments by: Tyler August September 20, 2026 Title: Copy Short Link: Copy 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 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 put 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.
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