Causes of breakdowns and repair of DVRs

Video surveillance equipment must work properly and without fail, provide video and audio recording of any situation from cameras, save information as files on digital media. These are electronic devices and they often fail. To restore working capacity, the specialists of the service center carry out professional repair of video recorders. With knowledge in the field of mechanical engineering, industrial electronics and practical skills, depending on the cause of the breakdown, some device owners perform technical work on their own.

Frequent malfunctions

The reliability of recorders varies by brand and manufacturer. Chinese video surveillance devices are cheaper, but break more often. Therefore, when buying equipment, special attention is paid to the possibility of warranty service from the official distributor of the manufacturer, provided that the cause of the breakdown is not an external mechanical impact.

There are such typical malfunctions:

1. The DVR constantly beeps, starts recording, as evidenced by a special icon on the screen, restarts recording, then the process repeats, the device wakes up. The reason for this may be the microSD card adapter. Reformatting a flash drive often does not help, so the drive is replaced.
2. When connected to the cigarette lighter, the device turns on, but loop recording does not work. The product is constantly in standby mode. This type of damage is rare. The problem is solved by replacing the adapter.
3. If the DVR is connected to the on-board network or cigarette lighter, the monitor may turn on, but then turn itself off. Sometimes a menu appears, consisting of 2-3 lines, the control buttons do not respond, the transition through the settings does not work. The reason is the micro USB connector on the power cable. To connect, you must use only the original cable included in the delivery of the video surveillance system. Otherwise, when buying a cable with a charger in salons or cellular stores, the wiring in the outlet will not work.
4. The gadget does not turn on and the red light is on. Sometimes the device wakes up and works for a long time, but then freezes. This is typical for devices with Full HD resolution of 1920x1080 pixels. After formatting the flash drive, the situation repeats. Corrected by removing the battery or pressing the RESET button. For continuous operation, the device is equipped with a memory card of the required class. This parameter can be seen in the technical specifications described in the operating instructions for the device. Class 10 is recommended for high resolution Full HD.
5. The device turns on and off spontaneously, without the user's command in automatic mode, stopping the recording. At the same time, car GPS-navigators can change the route and stick to it. Such shortcomings are often found in inexpensive Chinese models. The reason lies in the use of a charger with a low-quality micro-USB connector. Solved by replacing the charger.
6. When the equipment is completely discharged, the charging system fails, the device does not turn on, does not charge, does not respond to control buttons, including the RESET button. The problem applies to any model, regardless of price and brand popularity. To eliminate the cause, check the soldering of the connector, remove the battery and connect it directly to the mains so that voltage is applied to the battery contacts.
7. Slow startup of the device, accompanied by flickering of the screen. The battery loses capacity at low temperatures, the voltage drops below the threshold value, the charge controller blocks the charging process. When overheated in the sun, the battery swells, covers, protective films and fasteners are deformed. When swollen, it is changed, deformation is prevented by covering the device with a white cloth or aluminum foil. In the absence of signs of violation of the integrity of the battery within 1-2 minutes, a voltage of 3,7-4,2 V "-" is applied to the "+" and "-" terminals.

What to do

In case of intermittent failures and software failures in the operation of the DVR, the simplest solution is to reboot the device. The universal RESET button eliminates errors. If the reboot does not help, then you need to find out the reason for the failure of the device, because. Any factor, both external and internal, can cause equipment failure.

Common causes of recorder failure:

1. Penetration of particles of dust or water into the housing.
2. Short circuit.
3. Impact of insects and pests.
4. Power overload.
5. Loose connector.
6. Mechanical damage to surveillance cameras.
7. Damage to the power supply, internal drives.
8. Broken wire, loops.
9. Speaker failure.
10. Software (software) failure or outdated firmware version.

The main reason is the illiterate operation of the device. For example, an incorrect connection to a voltage of 12 volts, as a result of which the adapter burned out. The board is subject to further diagnostics and repair at the service center.

How to flash

To flash the DVR if it stops turning on, you need to go to the manufacturer's official page and download the updated version of the software. In the absence of a site, they find any other resources, for this they enter the word “Firmware” and the name of the model in the search bar. A program is downloaded to the computer in the form of a popular ZIP archiver, checked by an antivirus, and then the files are extracted.

The video recorder must be removed from the bracket, the battery removed and connected to the computer.

When downloading files to the machine's memory card, first remove and format it. The entire downloaded resource is transferred, installation begins. The process takes from several minutes to 1 hour and depends on the model. To complete the update:

• disconnect the recorder from the computer;
• turn it off with the power button;
• waiting for the update process to complete;
• turn on the device.

After flashing, if everything is done correctly, cyclic recording is established and all functions of working devices are restored.

It takes longer to flash Chinese models. Difficulties arise with the search for an SD memory card. To solve the problem, it is formatted not in the FAT 32 system, but in FAT. The files are copied to the root card, the write protection is removed. It should be borne in mind that if the software does not match the model of the registrar, the device will work with errors.

As for updating the software and the traffic police database in 3-in-1 recorders, which include a radar detector and a GPS navigator, the process is similar to that for simple devices. If during the download the antivirus program interferes with the work or unpacking of files, it is disabled. The memory card after flashing must be formatted.

How to disassemble

The device of a simple surveillance device looks like this:

• frames;
• microchip or board;
• Power Supply;
• screen;
• dynamic;
• camera eye;
• bras

Before disassembling the 1080p Full HD DVR, please disassemble it first:

• turn off the ignition;
• disconnect the battery terminals to avoid a short circuit;
• disconnect the power cable connected to the device;
• separate it from the bracket or remove it from the windshield.

Removing the mirror from the DVR depends on your settings. The interior mirror can be attached to the ceiling with bolts or self-tapping screws, and to the windshield with adhesive or suction cups. In the first case, unscrew the screws and remove the plug. If the unit is installed with the bracket glued to the surface, slide the latches or turn it to the side, otherwise the glass must be removed from the mounting area. It is difficult to carry out such an operation on your own, so it is better to contact the salon.

Disassembly of the DVR is carried out as follows. There are 4 screws along the edges of the box, 2 latches in the middle. The screws are unscrewed, the latches are bent with a sharp object. In expensive models, instead of latches, there are more reliable mounting screws. Rubber seals are installed in the mounting holes for elasticity, which move apart and move to the side. There is a speaker on the back. Therefore, the radio cover is removed carefully, without sudden movements, so as not to damage the components.

The board is securely fastened with clips. A speaker and a battery are soldered to the microcircuit. They are carefully removed with a knife or screwdriver. The screws holding the plate are smaller than the box elements. In order not to confuse and lose them, it is better to set them aside separately.

The battery is attached to the wall of the product with double-sided tape or glue, so it can be easily removed.

A flexible cable connects the camera and the board, there are slots between the conductors. In models with a swivel screen, the cable allows you to rotate the recorder to any angle. The monitor is in a plastic case, fixed with screws, which, if necessary, are simply unscrewed; glass is placed on top to protect it from bumps and scratches.

To remove the interior rear view mirror, you will need squeegees and picks. The product breaks down as follows:

• find the union of the body and the mirror;
• insert the clamp and gently press with a little effort until a gap is formed;
• a mediator is made around the perimeter, and the body is divided into 2 parts;
• the mirror is removed, under it are all the elements necessary for repair.

How to repair

To fix the built-in registrar, it is better to seek help from professionals. Repair of stationary devices can be done by hand.

In case of mechanical damage to connectors and connectors, they must be repaired. The standard USB connector contains 4 pins for 5V power and data transfer. The 5-pin miniUSB has an additional 5 pins connected to a common cable. In a 10-pin miniUSB, the distance between the contacts is small, so if such a connector fails, it is changed to a 5-pin one.

Repair of the DVR by replacing the connectors is carried out as follows:

1. The product is disassembled into its component parts.
2. The soldering iron is grounded: one end of the wire ("-") is soldered to the body of the device, the second ("+") to the body of the soldering iron.
3. The fastener is heated, the wires are soldered, the damaged connector is removed.
4. Check other components on the board for damage.
5. Solder the new connector.

If the DVR connector responsible for transmitting the modulator signal is faulty, check the board and the modulator itself. If they are repairable, remove the connector and inspect the distributor on it. The resistance value should not exceed 50 ohms. In case of deviations from the norm, the damaged connector is replaced.

If the recorder immediately turns off, the first step is to change the microSD card. In case of problems with the cable, remove the cover, board, camera, disconnect the cable. If the damage is obvious, it is changed and reinstalled, and the connector is bent and fixed.

In case of problems with the photoresistor, which usually fails when the product overheats in the sun, they are replaced with a new element if it is burned out, or repaired with a burner. The photoresistor is located next to the capacitor. To inspect it, disconnect the cable and turn off the converter without touching the camera.

It is difficult to repair the camera control module on your own. It needs to be disconnected and soldered. If the signal does not reach the memory block, the possible cause may not be a broken module, but accumulated dust. Therefore, it is necessary to disassemble the registrar, get to the part that is located next to the distributor, clean the contacts with a cotton swab and assemble the product.

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