Month: July 2025

Welcome back to the bench! In today’s blog, we dive into a common issue faced by owners of the Mercedes Metris van (known as the Vito outside of North America): a malfunctioning LCD gauge cluster backlight. This problem typically stems from a faulty dual pack transistor, a crucial component responsible for powering the backlight that displays vital information such as speed and odometer readings.

Identifying the Problem

As highlighted in the video, the speaker received a gauge cluster for repair, which suffered from a non-functioning backlight. The culprit was identified as a six-pin dual NPN transistor, a component that can easily be replaced. The speaker pointed out that while many might turn to online repair kits, which can be quite expensive, this issue can be resolved for just a fraction of the cost—around 36 cents, especially for those in the U.S.

Repair Tools and Techniques

The speaker introduced a repair kit that included a testing device, which allows for bench testing of the gauge cluster before and after the repair. This device is crucial for checking whether the repair has been successful. However, the speaker also aimed to determine if a simpler method could work, allowing individuals to test their repairs without needing this specialized equipment. The process involved connecting a 12V power source to the gauge cluster, checking which pins correspond to power, and troubleshooting from there.

Successful Repair and Testing

After replacing the faulty transistor, the speaker was able to power the gauge cluster and noted that the backlight came to life, indicating that the repair was successful. However, the testing process revealed that while the bench device is helpful, it may not be absolutely necessary for everyone. For those performing this repair at home, reconnecting the gauge cluster to the vehicle can serve as a quick and effective way to test functionality.

Future Possibilities

The speaker concluded with thoughts on potentially reverse-engineering the testing device for better accessibility, especially for those looking to conduct multiple repairs. This innovative spirit exemplifies the DIY approach that many car enthusiasts cherish. By sharing the part number for the dual NPN transistors, the speaker aims to empower others to tackle this repair on their own and save time and money in the process.

In summary, the video provides a practical guide for diagnosing and repairing a common fault in the Mercedes Metris and Vito gauge cluster. With the right information and tools, car owners can confidently approach repairs and ensure their vehicles remain in optimal condition. Stay tuned for more tips and tricks in the world of automotive repairs!

In this video we show how to repair a dead lCD backlight issue for a Mercedes Metris / Vito instrument cluster.

Replacement Part: https://www.digikey.ca/en/products/detail/nexperia-usa-inc/BC847BS-115/763239

Nexperia BC847BS,115 Dual NPN Transistor, 100 mA, 45 V, 6-Pin SOT-363

Watch on YouTube: Mercedes Metris & Vito W447 – LCD Backlight repair for gauge cluster

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Welcome back to the world of amateur radio! In this latest exploration, we dive into the transformative experience of flashing OpenGD77 firmware onto the GD-77 radio. The stock firmware, often regarded as lackluster, is about to be replaced by a feature-rich upgrade that turns this budget option into a versatile and powerful communication tool. The speaker enthusiastically outlines the myriad of enhancements OpenGD77 brings to the table, from real VFO mode to manual talk group overrides, all designed to elevate your radio experience.

What Makes OpenGD77 Stand Out?

One of the standout features of OpenGD77 is its real VFO mode, which allows users to operate the radio like a traditional analog device. This is a game-changer for enthusiasts who crave the tactile experience of tuning into frequencies. Additionally, the firmware enables manual talk group overrides, allowing users to input talk groups directly without needing to upload code plugs, making it a breeze to switch between communication channels on the fly. The extensive customization options, including hot keys for various functions, ensure that users can tailor their experience to their personal preferences.

Enhanced Audio and More Features

OpenGD77 also significantly improves audio quality, which means clearer communication and less distortion—a welcome change that listeners will appreciate. Other fun features include FM broadcast band access, Morse code capabilities, and, of course, the open-source nature of the firmware, which appeals to tech-savvy users who love to tinker. The speaker humorously notes that these upgrades can turn your GD-77 from a source of regret into an impressive talking point among internet friends.

Flashing the Firmware: A Step-by-Step Guide

For those ready to take the plunge, the speaker provides a detailed rundown of the flashing process. Essential materials include the GD-77 radio, a programming cable, a Windows PC, and the necessary OpenGD77 CPS and firmware files. The process is straightforward: download the latest firmware, set up the CPS, and follow the step-by-step instructions to successfully flash the OpenGD77 firmware onto the device. The speaker emphasizes the importance of using the correct programming cable, as not all cables will work with the GD-77.

Initial Impressions and User Experience

After successfully flashing the firmware, the speaker expresses excitement over the new interface and features. The ability to enter your country region and download local contacts directly onto the radio adds a layer of convenience that many users will find beneficial. The speaker shares their initial setup, including assigning a DMR ID and programming digital contacts, showcasing just how user-friendly the OpenGD77 firmware is. The experience is designed to be enjoyable, encouraging users to experiment with the radio and its extensive capabilities.

In conclusion, flashing the OpenGD77 firmware onto the GD-77 radio represents a significant upgrade that enhances functionality, user experience, and audio quality. This simple yet effective process opens the door to a world of possibilities for amateur radio enthusiasts, making it a worthy project for anyone looking to breathe new life into their device. With the right tools and a bit of patience, users can unlock the full potential of their GD-77 and enjoy a more satisfying radio experience.

Radioddity GD-77 – Let's install some custome firware to open the full potential of this radio. This is not a new radio, but with this firmware mod it has everything you need to enjoy DMR or conventional dual band radio.

LINKS

https://www.lyonscomputer.com.au/Radio-Transceivers/Radioddity/OpenGD77/OpenGD77.html

https://www.opengd77.com/viewtopic.php?f=5&t=1770

https://www.radioddity.com/pages/radioddity-download

Watch on YouTube: OpenGD77 on the GD-77: The Firmware It Should Have Shipped With

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If you’re a retro computing enthusiast, you’ve likely heard of the Gotek floppy emulator, a nifty device that replaces traditional floppy drives in older computers. In a recent video, a DIY enthusiast takes the basic Gotek model and upgrades it with an OLED display, a rotary knob for easier navigation, and the popular Flash Floppy firmware. This modification not only enhances the device’s usability but also brings it up to par with more advanced models available on the market.

The Upgrade Process

The speaker begins by highlighting the limitations of the basic Gotek model, which is often the only affordable version available. To improve the user experience, they opt to 3D print a new case that accommodates an OLED display and rotary knob, eliminating the need for drilling and filing. With a simple gray PLA filament, the printed parts provide a clean and functional aesthetic. The assembly process includes soldering the rotary encoder and OLED screen to the board, with careful attention to wiring to ensure proper functionality.

Flashing the Firmware

Once the hardware modifications are complete, the speaker shifts focus to installing the Flash Floppy firmware, which is crucial for enabling additional features like displaying long file names. By downloading the latest firmware version and following the specific programming steps, they successfully flash the device. This process involves temporarily inserting a jumper and using a USB cable to connect the Gotek to a computer, ultimately leading to the successful installation of the firmware.

Testing and Final Assembly

After the firmware is installed, a quick test reveals that the Gotek now recognizes a variety of disk images on a USB drive, including those with long file names. The speaker then addresses minor challenges with 3D printing the enclosure, such as lifting corners due to suboptimal settings. However, with some adjustments, a second print yields a perfectly aligned cover, ready for final assembly. The addition of LEDs further personalizes the project, showcasing the speaker’s creative flair.

Future Plans

Looking ahead, the speaker shares ambitions for a “version 2.0” of the project, which includes plans for an IDE to SD card reader integration. This would not only enhance the Gotek’s functionality but also provide users with an accessible option for data storage. The DIY approach, combined with the convenience of sourcing inexpensive components, makes this project both feasible and exciting for those interested in retro computing.

Overall, this upgrade project exemplifies the spirit of DIY innovation, breathing new life into a classic technology while providing a more user-friendly experience. Whether you’re a seasoned retro computing aficionado or a newcomer eager to dive into the world of floppy emulators, this modification offers practical insights and inspiration for your own projects.

Let's modify a cheap Gotek with the Artery AT32F415 Microcontroller to the Delux version, and install Flash Floppy firmware.

Flash Floppy Files and Instructions: https://github.com/keirf/flashfloppy

Flash Floppy Wiki: https://github.com/keirf/flashfloppy/wiki

Hardware Mods Instructions: https://github.com/keirf/FlashFloppy/wiki/Hardware-Mods#rotary-encoder

3D Print Files: https://www.printables.com/model/992898-internal-3-12-gotek-case-w-091-oled-display-window

OLED Screen: https://a.co/d/47kZ4pW

Rotary Encoder: https://a.co/d/9pFsWZq

Watch on YouTube: Upgrade a basic Gotek with OLED, Rotary Knob and Flash Floppy Firmware

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