The camera has no picture. What's going on here?

Why is there no image after Dahua network camera is installed?

1. The power supply of the network camera is insufficient.

The power of switching power supply itself is not enough, which leads to overheating of switching power supply and thermal protection. Check whether the field mode power supply has temperature. If it is cold, the power supply will crash.

Solution: Replace the power supply.

2, the network camera power supply voltage is not enough.

If the camera image flashes, it may be that the power supply voltage is insufficient. The power supply used in the camera description is 12V/2A. If it is 12V/ 1A, it is likely to flash, because the power supply is insufficient, so it needs to be replaced.

3. The network camera itself is out of order,

If this is the only analog camera with this fault, the program inside the analog camera may crash and recover after power failure and restart, which is mainly caused by poor reset circuit.

4. Reverse construction of the line.

The wire is too thin, resulting in a large voltage drop, and the analog camera cannot be started. The solution is to standardize the structure and measure the input voltage and current of the camera with a multimeter.

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Troubleshooting of network cameras;

Symptoms: The webcam can't find the IP, and there is no image.

There are many reasons why the webcam can't search for IP, and there are no images, which may be cameras, switches, optical fiber convergence, network cables and power supplies. Therefore, in the process of troubleshooting, we should choose the appropriate nodes to check one by one.

First, install the webcam search test software of the camera manufacturer on the notebook computer and test it on the front-end access switch. If the IP address of the camera can be searched and there is an image, it proves that the access switch of the monitoring point is normal. If there is no mirror or IP address can't be found, it proves that the access switch of the monitoring point is faulty.

If the part from the access switch to the monitoring point is normal, continue the test at the back end. If you can't search the IP address of the camera at this time, it proves that there is a problem with optical fiber fusion. If you can search the IP address of the camera, check the setting problem of the network HD hard disk video recorder, the network cable connection and the crystal head of the monitoring center.

If there is a fault between the access switch and the monitoring point, connect the front camera directly with a notebook to test whether the IP address of the camera can be searched by the camera software. If you can find the equipment, it proves that the network cable between the camera and the switch is blocked, you need to use the line tester to confirm it again and make the crystal head again.

If you still can't find the camera IP on the camera side, you need to consider the camera problem or the camera power supply problem. The multimeter can be used to test whether the power supply voltage of the camera is normal. If it is normal, it can be judged that it is a camera problem. If it is not normal, replace the camera power supply and retest.

What's wrong with the camera without an image?

Basically, there are two possibilities. One is that the lens shutter is not open, and the other is that the imaging CCD is broken and can't be solved by itself. You can only find professional maintenance, hehe, or you can call me.

The security host shows that the camera channel is online normally. Why are there no pictures of the camera?

It shows that the camera is online, indicating that the equipment has been connected to the security host, and there is no problem with the connection. The reason why the picture is not displayed is that there is a problem with video decoding. At this time, check whether the decoding format is consistent with H.265 and H.264, and consider whether the code stream is beyond the decoding range. Please try to reduce the code flow. When these two problems are solved, you can look at the picture.

Check whether there is a problem with the power supply of the surveillance camera. If it is an infrared surveillance camera, you can see a red light at night, indicating that the power supply is normal; If not, you can use a multimeter to measure the power supply and power supply line.

Check whether there is a problem with the wiring. If there is nothing wrong with the wiring, the camera may be broken. You can use the replacement method to test and change to a good camera. If there is an image, the camera is broken.

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Due to improper assembly of the machine, when the photosensitive device (photoresistor) is too far away from the hemisphere, the infrared lamp will not start completely, resulting in poor lighting at night;

The phenomenon that the image is white or bright white is mainly caused by the infrared light emitted by the infrared light emitting tube refracting to the lens through the spherical cover. The solution to this phenomenon is to prevent infrared light from refracting to the lens surface. Usually, a sponge ring is used to isolate the lens from infrared light, and the ball cover must be attached to the sponge ring when assembling.

Baidu encyclopedia-monitoring camera

The surveillance camera suddenly lost its picture. What happened?

Hello, you can check from the following aspects:

1, check the power supply of the surveillance camera. If it is an infrared surveillance camera, you can see a red light at night to indicate that the power supply is normal; If it is not infrared, measure the power supply and power cord with a multimeter.

2. Check whether there is any problem with the line. If there is nothing wrong with the line, the camera may be broken. You can test it with a good camera. If there is an image, the original camera is broken.

3. See if there is anything wrong with the video terminal, because the video device is set incorrectly or the video terminal and camera don't match, a black screen will appear.

4. The monitored video signal line is broken (including line damage and poor connector contact), which will also cause a black screen. Just replace the wiring or connector.

5. Monitor whether the control equipment of the camera works normally, such as DVR/NVR/ acquisition card. Check whether the related software works normally and whether it is the latest version. If not, please contact the manufacturer to upgrade the software.

I hope the above answers can help you.

The surveillance camera is on, but there is no image. What happened?

The monitoring camera is powered on, and the network cable wiring is too long or the internal resistance of the network cable is too large (do not use the network cable below category 5);

PoE output power is not large enough (generally, the power of gun-type infrared network camera is about 3-8 W);

The network cables are not connected in the correct order.

During construction, the wiring is reversed, the wire is too thin, and the pressure drop is large, so the analog camera cannot be started. The best solution is to standardize the structure and measure the input voltage and current of the camera with a multimeter.

The correct network cable ranking is that the crystal head touches itself and the network cable is off. The order of network cables from left to right is orange white, orange, green white, blue, blue white, green, brown white and brown. These are just faults caused by wiring. In fact, if it is not set properly, there will be no image. Every product has different settings, but it will never change. If you mainly follow the menu, I believe it will be no problem.

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There are usually three situations:

(1) The light is on and flashing, indicating that the signal is normal.

(2) It's just on, not flashing, indicating that there is something wrong with the camera. Turn off the camera for a while, and then restart it (in most cases).

(3) If it doesn't light up, first check whether the RJ45 crystal head is in good condition (both the switch and the camera are in good condition) and whether the camera power supply is normal (12v or 24v). Measure whether the network cable is damaged.

Second, see if the host is working normally. Enter the system to see if you can find the ip address (that is, the camera address) of the channel without image. If not, check the switch and camera for problems.

Third, restart the camera, switch and host. As long as the hardware is not broken, most reboots can be solved.

Fourth, if optical fiber transmission is used, it depends on whether the optical fiber transceivers at both ends work normally.