The prefix oriel 750 does not turn on. DVB-T2 tuner does not turn on

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Prefixes digital television not so long ago entered our lives, but besides good points cause a lot of criticism in terms of quality. It is still too early to talk about some statistics and how much they work out for failure, but already now there are quite a few cases of failure in the operation of these TV set-top boxes.

I will list some of the most common malfunctions in which the prefix refuses to work:

• the red indicator is on;
• red indicator flashes;
• the console reboots and does not turn on;
• writes "ON" and does not turn on (the green light is on);
• the tuner does not turn on after the firmware;
• does not turn on from a distance.

The reasons why the tuner does not turn on can be divided into several groups:

1. Electrical circuit malfunction;
2. Firmware failure;
3. Remote control malfunction.

In case of any breakdown in the circuit, it can manifest itself in different ways, but the worst thing is that with the same manifestations, the reasons can be completely different. For example, when the tuner is connected to the network, the red light (network indicator) is on, but it does not go further than this, that is, the set-top box does not respond to the remote control and control buttons. This case may apply to any of the groups listed above.

The purpose of the article is not to analyze the device of the set-top box and how to repair it, but to give an idea of ​​how at the first stage to try to independently diagnose and draw any conclusion about the malfunction. If there are no repair skills, you need to contact the repair service, since repairs require not only knowledge, but also special equipment.

CIRCUIT FAILURE

It all depends on the quality of the circuit elements, so well-known brands producing DVB T2 tuners that use a higher quality element base are more preferable.

The easiest way to diagnose a breakdown is when the indicator (light on the panel) does not light up. This clearly indicates a malfunction of the power supply.

If the light is blinking, this may indicate a malfunction of the PSU, and the chassis (this is the main board with the tuner and processor) of the set-top box, as well as a firmware failure.

In the case when the device spontaneously, repeatedly reboots and does not turn on, all the same elements of the set-top box can be to blame. You can read about such repairs. If the display reads “ON” and the indicator is green, and the set-top box does not turn on, then this may also indicate a malfunction of the circuit.

FIRMWARE

As noted above, in some cases it is quite difficult to separate what exactly is the cause of the malfunction of the firmware or the electronic part of the circuit without additional measurements. But if the tuner does not turn on after the firmware, then the conclusion is unambiguous, it is she who is faulty.

Here you need to warn that you need to be careful when updating, follow the instructions and install exactly the firmware that is required for your device.

With such a malfunction, you need to contact the service, although not every center undertakes such repairs.

REMOTE CONTROLLER

On many cheap models of set-top boxes, there are no control buttons on the front panel, and this is a significant minus, since if the remote control malfunctions, you lose the ability to control the tuner at all. This has already been written on the site in an article about choosing a prefix.

Therefore, if the remote control does not work digital set-top box, only the purchase of a new one or a master will help to identify. Unfortunately remotes for tuners are still rare and quite expensive.

It happens that the tuner does not turn on from a long distance, both the tuner and the remote control itself (which is rare) can be guilty here. You can try replacing the batteries, but if it doesn't help, buy a new one. If in this case there is a negative result, then the prefix is ​​\u200b\u200bto blame.

Once again, without special skills, it is difficult to solder parts on your own, which can cause great harm to the board.

The fleet of analog TVs is rather reluctant to give way to digital equipment, gradually taking “second” places - in the kitchen, in offices, workshops, garages, etc. At the same time, DVB-T2 set-top boxes and decoders are being transferred. We have already managed to evaluate the advantages of the latter, while some owners also appreciated the disadvantages - the rather low reliability of these devices. As a rule, one of the weakest points of this kind of equipment is a switching power supply - most cases of failures are associated precisely with a malfunction of the power supply, and a PSU failure can lead to such serious consequences that it will be impossible to repair the device. And yet, using the example of two set-top boxes for receiving digital TV, the possibility of repairing them independently will be considered here. The first device is TVK 3101. When turned on, the image had strong distortions, periodically completely disappeared. A few days later, the set-top box began to turn off a few seconds after the manufacturer's logo appeared on the screen.

The second device is the Oriel 740 prefix. This device did not respond to commands from the remote control, the indicator barely noticeably glowed red.

After opening the cases of the set-top boxes, it turned out that in both cases the electrolytic capacitors of the secondary power filters were swollen.

It should be borne in mind that when working with the attachment, special care should be taken - the primary power supply rectifier of the power supply unit converts an alternating voltage of 220 volts into a constant value of about 300 volts, and this potential remains at the terminals of high-voltage electrolytic capacitors for some time after power is removed - up to several tens of seconds . In the pictures, they are located between the pulse transformers and the plugs of the power cords. Before working with the device board, these capacitors must be short-circuited through a resistor with a resistance of 51-62 kOhm.

Both faulty capacitors turned out to be almost the same - 1000 uF, 10 V. The picture shows one of them. The fact that its cover is barely deformed in appearance should not give you the slightest confidence that the part is in good condition - even if some part of the container is preserved, such a part will have an increased leakage current, which is unacceptable. When replacing, you should select capacitors with the same operating voltage or with a slightly higher one, as in the picture - instead of a 10-volt part, a 16-volt part is shown, and with the same dimensions. Of course, defective parts should be replaced with new ones, not used ones - otherwise the repair will have to be repeated soon.

After the replacement, turn on the set-top box - the indicator lights up brightly, the device responds to the commands of the remote control, the image is stable. But the repair is not over yet...

Traces of flux remained on the board - solder paste, rosin ... High-frequency currents can quite easily pass through such a coating wherever they please. As a result, we can get an unstable image, noise, etc. over time. trouble. Therefore, carefully wash the board with a cotton swab moistened with alcohol or acetone. After such cleaning, wipe the board with a dry cotton swab

We install the board in place, check - it works.

Now we assemble the prefix completely and once again check the performance.

Similarly, we check the second device - the device is working normally, the repair is completed.

In conclusion, I will add that the quality of the power supply antenna amplifier also greatly affects the operation of the set-top box. So, with insufficient capacity of the filtering capacitor, signal loss is possible - there have been cases of complete loss of the channels of the second multiplex. To recognize a malfunction of the antenna PSU, it is enough to replace it with a DC source with a voltage of 9-12 volts (for example, a Krona-type battery or a battery from a computer uninterruptible power supply). If the reception quality improves, then you should replace the antenna power supply with a known good one.

Update software(firmware) of your equipment is performed only in cases where there are any problems, or an update will add useful functions to the device. It is not recommended to flash devices without the need, because. during the firmware update process, there is a possibility of equipment failure. If you are not sure that you can handle the firmware update yourself, we recommend that you contact the appropriate service center to qualified professionals.

Download ORIEL firmware file:

Oriel 810 Receiver Firmware File - (version 3.4) This update only applies to receivers with serial numbers 81111200001 to 81111205050 and 81120100001 to 81120106060. .
Oriel 820 receiver firmware file - (version 1.0 from 08/01/2012). This update only applies to receivers with serial numbers 82120100001 to 82120105280. .
Oriel 710 receiver firmware file - (version 1.3.5). This update only applies to receivers with serial numbers 710121000001 to 710130211200.
Oriel 720 receiver firmware file - (version 1.3.5). This update only applies to receivers with serial numbers 720121000001 to 720130202200.
Oriel 910 receiver firmware file - .
Oriel 920 receiver firmware file - .

Official website of the manufacturer:

You can check the availability of newer software on the official website of the manufacturer -
Questions about ORIEL brand equipment, you can ask through.

How to update the firmware:

Proceed as described in the user manual. If this information is not in the manual, then contact the service technical support your equipment.

Useful links:

In order to unzip the firmware file, you may need an archiver program. One of the most popular is .

Manufacturers:

You can add the latest software for your equipment by writing to us via .