Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your YADEA T319 LED Display EBike Conversion Kit. This display unit is designed to provide essential information and control functions for your 36V electric bicycle system.
Product Overview
The YADEA T319 LED Display is a compact and intuitive control unit for electric bikes. It features a 36V power display, three-speed switching capabilities, and a light-sensitive headlight switch function. The display utilizes an octagonal protocol for communication within your e-bike system.

Package Contents
Upon opening the package, you should find the following item:
- 1 x YADEA T319 LED Display Unit
Installation Guide
1. Mounting the Display
- Identify a suitable location on your bicycle handlebars for the display unit. Ensure it is easily accessible and does not obstruct your view or control of the bike.
- Use the integrated clamp and screws on the back of the display to securely attach it to the handlebar. Tighten the screws firmly but do not overtighten.


2. Wiring Connections
The display unit comes with a pre-wired cable, approximately 190mm in length (including the plug-in connector). Connect the display to your e-bike controller according to the following wire color scheme and octagonal protocol:
- Black Wire: Bottom Line (Ground)
- Red Wire: Power Line (Positive 36V)
- Blue Wire: Locking Line (Ignition/Key Switch)
- Green Wire: Meter Signal
- Yellow Wire: Meter Signal
Ensure all connections are secure and properly insulated to prevent short circuits or damage to the system.

Important: This display is designed for 36V systems and uses an octagonal protocol. Ensure compatibility with your e-bike controller before connecting.
Operating Instructions
1. Power On/Off
- To turn on the display and your e-bike system, press and hold the Power Button (red button with power symbol) until the display illuminates.
- To turn off the system, press and hold the Power Button again until the display turns off.
2. Speed/Assist Level Switching
The display supports three-speed or assist levels, indicated by the numbers 1, 2, and 3 on the display panel.
- Press the '+' Button to increase the assist level (e.g., from 1 to 2, or 2 to 3).
- Press the '-' Button to decrease the assist level (e.g., from 3 to 2, or 2 to 1).
3. Headlight Control
The display features a light-sensitive headlight switch function.
- To turn on the headlights, long press the '+' Button. The headlight indicator (light bulb symbol) on the display will illuminate.
- To turn off the headlights, long press the '+' Button again.
4. Display Information
The LED display provides the following information:
- Battery Level: Indicated by the bar graph at the top of the display.
- Speed/Assist Level: Shown by the illuminated numbers (1, 2, or 3).
- Digital Readout: The "8.8" segment display typically shows current speed or other relevant data depending on the e-bike system's configuration.
- Headlight Indicator: A light bulb symbol illuminates when the headlights are active.
- Walk Assist Mode: A walking person symbol indicates walk assist mode, typically activated by a specific button press (not explicitly detailed for this model, but common for e-bike displays).
Maintenance
- Cleaning: Wipe the display screen and casing with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Water Exposure: While designed for outdoor use, avoid prolonged exposure to heavy rain or submerging the unit in water. Ensure the connector is dry before connecting or disconnecting.
- Cable Inspection: Periodically check the wiring for any signs of wear, cuts, or loose connections.
- Storage: When not in use for extended periods, store the e-bike in a dry, temperate environment.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display does not turn on. | No power, loose connection, faulty power button. |
|
| Speed/assist level not changing. | Faulty '+' or '-' button, communication issue. |
|
| Headlight not turning on. | Loose connection, faulty headlight, incorrect operation. |
|
| Inaccurate or no digital readout. | Sensor issue, communication problem. |
|
Specifications
| Feature | Detail |
|---|---|
| Model | T319 |
| Type | Display |
| Voltage | 36V |
| Protocol | Octagonal protocol |
| Functions | 3-speed switching, light-sensitive headlight switch, power display |
| Wire Length | 190mmL (including plug-in) |
| Accessory Code | E4063600022 |
| Manufacturer | Yaday Technology Group Co. |
| Origin | Mainland China |
| Compatible Models | L-EBX805 (NIKKI bike), L-EBX805-Korean bike |
| Package Weight | 0.05 kg |
| Package Dimensions (L x W x H) | 9cm x 6cm x 7cm |
User Tips
- Always ensure your e-bike battery is fully charged before long rides to avoid unexpected power loss to the display and motor.
- Familiarize yourself with the button functions before riding, especially the headlight control, for safe operation.
- If you experience any unusual behavior, first check all cable connections for tightness and proper seating.
Warranty and Support
For warranty information or technical support, please contact the seller or the manufacturer, Yaday Technology Group Co., directly. Keep your purchase receipt as proof of purchase.





