Black screen on the monitor after connecting the video camera via BNC cable - a typical problem when signal standards (PAL/NTSC) do not match or there is no power to the camera. If you are using analog camera (for example, Dahua HFW1200S or Hikvision DS-2CE16D0T-IRP) with a modern monitor via a BNC→HDMI adapter, first check whether the power indicator on the camera unit is lit, whether the input source on the monitor is selected correctly (AV, HDMI or VGA). In 80% of cases, the malfunction lies in the incorrect selection of the adapter or lack of signal synchronization.

Digital IP cameras (Axis M3046-V, Bosch NDN-498V12) require a different approach: they are connected to the monitor via PoE switch or directly via Ethernet with IP address settings. If the image is displayed with artifacts (strips, torn frames), either the low bitrate in the camera settings or a lack of network bandwidth is to blame. For diagnostics, use the utility ONVIF Device Manager — it will show the actual stream resolution and codec (H.264/H.265).

1. Types of video cameras and compatibility with monitors

The choice of connection method depends on type of video camera and available connectors on the monitor. Analog cameras transmit signals via coaxial cable (BNC), digital IP cameras - over the network (RJ-45), and modern USB/HDMI cameras are connected directly. Below is the compatibility table:

Camera type Camera connector Required adapter/cable Max. resolution
Analog (AHD/TVI/CVI) BNC (female) BNC→HDMI converter or BNC→VGA 1080p (2MP)
IP camera (PoE) RJ-45 PoE injector + HDMI output on NVR 4K (8MP)
USB webcam USB Type-A/B/C Direct connection to a USB monitor 1080p (less often 4K)
HD-SDI BNC (digital) BNC to HDMI converter with SDI support 1080p60

⚠️ Attention: Cameras with connector BNC There are two types - analog (composite signal) and digital (HD-SDI). The latter require a specialized converter (for example, Blackmagic Design Mini Converter), since a regular BNC→HDMI adapter does not recognize the SDI signal. Check the markings on the camera: inscription SDI or 3G-SDI indicates digital format.

This parameter is critical for IP cameras bitrate. If the monitor is connected to the same network as the camera, but the image is slow, reduce the bitrate in the camera settings to 4 Mbps (for Full HD). On the menu Hikvision path to setup: Configuration → Video/Audio → Video → Bitrate Type (select CBR for a stable flow).

📊 What type of camera are you connecting?
Analog (BNC)
IP camera (PoE/Ethernet)
USB webcam
HD-SDI
I don't know

2. Connecting an analog camera to a monitor via BNC

For cameras with a connector BNC (for example, Samsung SCB-2000 or Sony EVI-D70) you will need a signal converter. Sequence of actions:

  1. Check power: Connect the 12V/24V power supply to the camera. The indicator on the case should light up green or red.
  2. Connect the camera and converter: Use coaxial cable RG59 (for distances up to 300 m). Connect the BNC connector of the camera to the input port of the converter.
  3. Select signal standard: on the converter (for example, Portta PET1039) switch the toggle switch between PAL (Europe) and NTSC (USA). Relevant for Russia PAL.
  4. Connect the converter to your monitor: Use HDMI cable for modern monitors or VGA for older ones.

If the image is missing:

  • 🔌 Check the integrity of the coaxial cable - kinks or damage to the shielding cause interference.
  • 📺 On the monitor, select the correct input source (button Source or Input).
  • 🔄 Reboot the converter by disconnecting it from power for 10 seconds.
  • 🛠️ For cameras with PTZ control (rotary) may require a separate controller (Pelco-D/P).

Camera power is on (LED is on)|

Coaxial cable intact (no fractures)|

Converter switched to PAL/NTSC depending on region|

The monitor is set to the correct input (HDMI/VGA)|

Checked for interference from nearby electrical appliances -->

⚠️ Attention: When connected to a monitor via VGA the image may be black and white. This is due to the lack of a color signal in the composite output of some converters. The solution is to use an HDMI output or a converter that supports CVBS (for example, Neoteck NTK-PAL).

3. Connecting IP camera to monitor: PoE and NVR

IP cameras (Axis P3225-LV, Dahua IPC-HFW5231E-Z) transmit video over the network, so an intermediate device is needed to output it to the monitor:

  • 🌐 PoE switch + computer with program (Blue Iris, iSpy).
  • 🖥️ NVR recorder with HDMI output (for example, Hikvision DS-7608NI-K2).
  • 📱 Direct connection to a monitor with a built-in browser (Smart-TV with RTSP support).

Step-by-step instructions for connecting via NVR:

  1. Connect an IP camera to the port PoE to NVR using twisted pair (Cat5e/Cat6).
  2. From the NVR menu, select Add Camera → Auto Search. The system should detect the camera automatically.
  3. If the camera is not found, check:
    • IP address subnet match (for example, camera 192.168.1.108, NVR — 192.168.1.1).
    • Is it disabled on the camera? DHCP (in manual mode, register a static IP).
  • Connect the NVR to the monitor via HDMI and select the desired channel in the recorder interface.

    • For direct connection to Smart-TV:

    1. Find out the RTSP stream of the camera (example for Hikvision): 
      rtsp://192.168.1.108:554/Streaming/Channels/101
    2. On your TV, open the app VLC or embedded player, paste the link.
    3. If authorization is requested, use the camera login/password (by default, often admin/12345).
    💡

    If the IP camera does not connect to the NVR, reset its settings to factory settings: press and hold the button Reset on the camera body for 10–15 seconds. After the reset, the IP address will return to the default (usually 192.168.1.64).

    4. USB and HDMI cameras: direct connection

    Modern webcams (Logitech Brio 4K, Razer Kiyo Pro) and specialized video cameras with a connector HDMI (Blackmagic Pocket Cinema Camera) connect to the monitor without adapters, but there are some nuances:

    • 🎥 USB cameras require a monitor with a USB port and support UVC (USB Video Class). Examples of compatible monitors: ASUS ZenScreen Touch, LG 27UD68-W.
    • 📹 HDMI cameras (for example, Sony FX3) are connected directly, but the monitor must support HDMI-in (rarely encountered; usually HDMI is used as an output).
    • 🔄 For cameras with Micro-HDMI (GoPro Hero11) adapter required Micro-HDMI → HDMI.

    If the monitor does not recognize the USB camera:

    1. Check if your monitor supports Picture-in-Picture (PiP) for external sources.
    2. Update the monitor firmware on the manufacturer's website (for example, for Dell UltraSharp use Dell Display Manager).
    3. Connect the camera via USB hub with external power supplyif the monitor does not provide enough current.
    List of monitors that support USB cameras (UVC)

    Dell U2723QE (USB-C with DisplayPort Alt Mode)
    LG 27UP850-W (USB 3.1 Type-C)
    HP E27d G4 (built-in USB hub)
    BenQ PD2700U (compatible with Logitech C922)

    Before purchasing, check the specifications on the manufacturer's website!

    5. Common errors and their elimination

    Even if the connection is correct, problems may occur. Below are typical symptoms and solutions:

    Problem Probable Cause Solution
    Black screen on monitor PAL/NTSC standards mismatch Switch the toggle switch on the converter or in the camera settings
    Image with stripes Damaged coaxial cable Replace the cable with RG59 double shielded
    No sound when connected via HDMI Converter does not support audio Use a separate audio cable or IP camera with AAC-codec
    Video delay (lag) High bitrate or slow network Reduce bitrate to 2–4 Mbps or use a wired connection

    ⚠️ Attention: If when connecting IP cameras An error appears through the monitor browser (Smart-TV) 401 Unauthorized, disable protocol authorization in the camera settings Digest and just leave Basic. On the menu Hikvision path: Configuration → Network → Advanced → HTTP.

    Critical error: Never connect PoE camera to a regular Ethernet port of a monitor or computer without a PoE injector! This may damage the network card. According to standard IEEE 802.3afPoE supplies up to 15.4W, which exceeds the load capacity of most motherboards.

    6. Image optimization: resolution, FPS, color profile

    After successful connection, adjust the video settings for maximum quality:

    • 📏 Resolution: For analogue cameras, the maximum is 1920×1080 (2MP). For IP cameras, select the native sensor resolution (for example, 2560×1440 for Axis Q1659).
    • 🎞️ FPS: For smooth video, set 25–30 fps. Enough to save recording space 15 fps.
    • 🎨 Color profile: In camera settings, select Day/Night Mode → Auto (for correct operation of IR illumination).
    • 🔍 Noise reduction: Activate 3D-DNR for shooting in the dark (reduces grain).

    To calibrate color on your monitor:

    1. In the monitor menu, select the mode sRGB or DCIP3 (for professional color rendering).
    2. Use test patterns (eg Lagom LCD test) to adjust brightness/contrast.
    3. For IP cameras, calibrate white balance Manually: From the camera menu, select White Balance → Manual and point the lens at a white piece of paper.
    💡

    To shoot in the dark, turn off automatic IR-cut filter in the camera settings. This will improve the sensitivity of the IR illuminator, but colors may become less saturated during the day.

    7. Wireless solutions: Wi-Fi and 4G cameras

    If cabling is not possible, use wireless cameras (Reolink Argus 3 Pro, Ezviz C3W>). To connect to a monitor:

    • 📶 Connect the camera to the same Wi-Fi network as the monitor (Smart-TV or tablet with HDMI output).
    • 🔗 Install the manufacturer's application on a device with a monitor (for example, Reolink App for Android TV).
    • 🌐 For 4G cameras (Solar-Powered 4G Camera) use a SIM card with an unlimited tariff and set up DDNS for remote access.

    Limitations of wireless solutions:

    • 📉 Video delay (latency) up to 2–5 seconds (critical for security systems).
    • 🔋 Power: wireless cameras require regular charging (exception: models with solar panels).
    • 📡 Interference: At the 2.4 GHz frequency, interference may occur when working near microwaves or other Wi-Fi devices.

    8. Selecting equipment: what to buy for connection

    The minimum connection set depends on the camera type:

    Camera type Required equipment Model example Cost, ₽
    Analog (BNC) BNC→HDMI converter, 12V power supply, RG59 cable Neoteck NTK-PAL 1 500–3 000
    IP camera (PoE) PoE injector, Cat6 twisted pair, NVR with HDMI TP-Link TL-POE10R + Hikvision DS-7104NI-K1 5 000–15 000
    USB webcam Monitor with USB port or USB hub Logitech C920 + Dell U2415 8 000–20 000
    HD-SDI SDI→HDMI converter, BNC cable (75 Ohm) Blackmagic Mini Converter 12 000–25 000

    When purchasing converters, pay attention to:

    • 🔌 Food: Some adapters require an external unit (for example, Portta PET1039 works from 5V USB).
    • 📺 Permissions support: Cheap converters may not handle 1080p (maximum 720p).
    • 🔊 Audio: If you need sound, look for models with a jack 3.5mm Audio In.
    💡

    To save money when connecting multiple IP cameras, use PoE switch instead of separate injectors. For example, Zyxel GS1900-8HP 8 ports will cost less than 4 separate ones TP-Link TL-POE10R.

    ❓ How to connect an old analog camera to a modern 4K monitor?

    Use a converter BNC→HDMI with upscaling (scaling) to 4K, for example Kiloview P1. It converts the analog signal to digital and increases the resolution to 3840×2160, but the actual quality will remain at the level of the original source (maximum 1080p for AHD). An alternative is to connect the camera to NVR with a 4K HDMI output that upscales the image itself.

    ❓ Why does the IP camera connect to the phone but not appear on the monitor?

    The problem is network settings. Most likely, the phone and camera are on the same subnet (for example, 192.168.1.x), and the monitor in another. Solutions:

    1. Connect the monitor (Smart-TV) to the same Wi-Fi network.
    2. Set up Port Forwarding on the router for external access.
    3. Use P2P protocol (enabled in camera settings).

    Check if your monitor's firewall is blocking incoming connections (setting Firewall in the TV menu).

    ❓ Is it possible to connect a video camera to a monitor without a recorder?

    Yes, but the methods depend on the type of camera:

    • Analog: via BNC→HDMI/VGA converter.
    • IP camera: directly via RTSP stream (if the monitor supports browser or applications).
    • USB/HDMI: Directly to the monitor with the corresponding port.

    Without a recorder, you will lose the recording and archiving functionality, but real-time viewing will be available.

    ❓ How to reduce video delay when connected via Wi-Fi?

    Delay (latency) occurs due to video buffering and compression. Reduction methods:

    • Switch the camera to a wired connection (PoE).
    • Reduce resolution to 1280×720 and bitrate up to 1–2 Mbps.
    • Disable H.265 and use H.264 (less CPU load).
    • In the router, turn on the mode Game Mode or QoS to prioritize camera traffic.

    Minimum latency (up to 100 ms) is achieved when connected via Ethernet with protocol Multicast.

    ❓ What cable is needed to connect the camera at a distance of 200 meters?

    For analog cameras (BNC) use:

    • RG59 with signal amplifier (maximum 300 m).
    • RG6 with double shielding (better protected from interference).

    For IP cameras:

    • twisted pair Cat6 with PoE extension cable (up to 100 m without amplifier).
    • Fiber optic cable with media converters (up to 2 km).

    ⚠️ For cable lengths >100 m, PoE will require PoE extender (for example, Ubiquiti GBE).