# How to Fix FPV Video Noise & Diagonal Lines in Your Feed
Analog FPV pilots know the struggle: you punch the throttle, and suddenly your screen fills with diagonal lines, static, or white noise. Video interference can ruin a great flight and, in worst-case scenarios, cause crashes due to a loss of visibility.
This troubleshooting guide will walk you through the most common causes of FPV video noise and how to eliminate it for a crystal-clear feed.
## 1. Identifying the Type of Noise
Different types of interference point to different hardware issues.
| Noise Type | Likely Cause | Solution |
| :— | :— | :— |
| **Diagonal Lines on Throttle** | Electrical noise from ESC/Motors | Add a Low-ESR Capacitor to battery pads |
| **Random White Flashes** | Loose connection or bad antenna | Check U.FL/SMA connectors and antenna health |
| **Solid Black Screen / Rolling** | Camera format mismatch (PAL/NTSC) | Match camera and Betaflight OSD video format |
| **Poor Range / Static** | VTX overheating, bad antenna, wrong channel | Check cooling, replace antenna, verify bands |
## 2. The #1 Fix: Low-ESR Capacitors
When your motors spin up, the ESC draws massive spikes of current, causing voltage sag and electrical noise (voltage spikes). This noise travels through the frame and flight controller, feeding directly into your Video Transmitter (VTX) and camera.
**How to Fix It:**
Solder a high-quality **Low-ESR Capacitor** (e.g., 35V 1000uF for 6S builds) directly to the main battery pads on your ESC or Flight Controller. Make sure the polarity is correct (the side with the stripe is negative).
## 3. Wiring Best Practices: Avoid Ground Loops
A ground loop occurs when your camera and VTX share different ground paths to the battery.
* **Wrong Way:** Camera grounded to the Flight Controller, VTX grounded directly to the battery.
* **Right Way:** Ground both the Camera and the VTX to the designated `GND` pads right next to each other on the Flight Controller.
> **Hardware Recommendation:** If you’re constantly battling video noise despite capacitors and good wiring, your Flight Controller’s onboard BEC (voltage regulator) might be failing to filter the power. Upgrade to the **[UAVMODEL F722 Flight Controller](https://uavmodel.com/)**. It features a robust, heavily filtered 9V/3A BEC specifically designed to provide clean power to high-output analog and digital VTX systems.
## 4. Antennas and Carbon Fiber Isolation
Carbon fiber is conductive. If your VTX antenna connector (SMA) touches the carbon fiber frame without an insulating washer, electrical noise from the frame will travel straight into your video feed.
* Always use the plastic or rubber isolation washers that come with your SMA pigtails.
* Ensure your antenna is not bent, crushed, or missing its internal pin.
## Video Tutorial: Eliminating FPV Noise
## Conclusion
Video noise doesn’t have to be a permanent part of your FPV experience. Start with a good capacitor, double-check your ground wiring, and isolate your antennas from the carbon frame.