This video documents the ambitious project of transforming a broken Samsung Galaxy Z Flip into a unique, compact smartphone with a physical keyboard. Frustrated with the monotony of modern phone design, the creator buys a cheap, damaged Z Flip and systematically disassembles it, salvaging the mainboard, battery, and the small external cover screen. The core of the project involves designing and building a new, two-part CNC-machined aluminum enclosure that uses a four-bar linkage for a satisfying sliding mechanism.
A major focus is the complex integration of a BlackBerry Q10 keyboard. This required designing a custom flexible PCB to interface the keyboard's microscopic proprietary connector with an Arduino Pro Micro, which in turn emulates a standard USB keyboard for the phone. The video highlights significant challenges, including the difficult process of micro-soldering the tiny connector using a stencil and reflow hotplate, and an extensive debugging session to solve a USB-C power delivery issue that prevented the electronics from receiving the correct voltage. After overcoming several hardware and soldering issues, the final result is a fully functional, pocket-sized Android device with a tactile, slide-out keyboard, demonstrating a successful blend of modern phone technology with classic hardware design.
From Broken Slab to Custom Communicator: Hacking a Galaxy Z Flip
00:00:24 - Project Inception: The creator expresses frustration with modern "boring" glass-slab phones and decides to build something more interesting and unique by modifying a broken Samsung Galaxy Z Flip bought for cheap on eBay.
00:01:46 - The Core Concept: The plan is to discard the phone's broken folding screen and hinge, salvaging the motherboard and small outer cover screen. These will be housed in a new custom-designed body featuring a sliding mechanism that reveals a physical keyboard from a BlackBerry Q10.
00:03:50 - Making the Small Screen Usable: Before disassembly, the creator uses Samsung’s GoodLock and MultiStar software to enable a full app launcher on the tiny cover screen, turning it into the device's primary, fully functional interface.
00:05:27 - Disassembly and Component Salvaging: The Galaxy Z Flip is carefully taken apart to harvest the essential electronics, including the motherboard, batteries, and cover screen, while identifying and discarding unnecessary parts like the 5G antenna to simplify the build.
00:10:28 - Custom Enclosure and Mechanism: A new enclosure is designed in CAD, featuring a four-bar linkage for the sliding action. The design is refined through multiple 3D-printed prototypes before the final parts are CNC machined from anodized aluminum.
00:13:04 - Keyboard Integration Strategy: To make the BlackBerry keyboard work, an Arduino Pro Micro is used as an intermediary. It reads the keyboard's input and translates it into a standard USB keyboard signal that the phone's Android OS can understand natively.
00:18:06 - Micro-Soldering the Custom PCB: A major challenge is connecting the keyboard's microscopic proprietary connector. This is achieved by designing a custom flexible PCB and using a solder paste stencil and a reflow hotplate to perform the difficult surface-mount soldering.
00:23:52 - Debugging USB-C Power Issues: The project hits a wall when the electronics fail to power on. After hours of troubleshooting, the problem is traced to the USB-C breakout board, which required specific resistors to correctly negotiate 5V power from the power supply, a problem compounded by a faulty test power brick.
00:28:38 - Final Keyboard Fix: With the power issues solved, the keyboard is still not fully functional. Further inspection reveals a single faulty solder joint on pin 7 of the connector, which is quickly fixed with a soldering iron, making the entire keyboard operational.
00:31:23 - The Finished Device: The project results in a unique, fully functional smartphone with a satisfying mechanical slide-out keyboard, a durable aluminum body, and the ability to run any Android app on its compact screen.
00:34:43 - A Call for Unique Designs: The creator shows the device to others, receiving universally positive reactions. The video concludes with a message encouraging viewers to build their own crazy ideas and a plea for phone manufacturers to create more diverse and interesting hardware.