DIY receiver repair

Let's consider some of the nuances of the repair in more detail. If the receiver works, but not correctly, then at the beginning of the repair, first of all, you should check (or reinstall again) all the necessary software settings of the equipment. If this does not help, we proceed to check the antenna-feeder path - we check the antenna settings (whether it has moved, is there any damage or deformation). Next, we check the converter and the lead-in cable.

The converter can be checked using Satfinder or another receiver - if there is a problem in it, you will have to spend money on buying a new one (although some, especially inquisitive home-builders, manage to cut the internal silumin case of the converter and get to its insides). I would especially like to draw your attention to the choice of an antenna cable - the use of a low-quality (China or Poland) antenna cable of the RG-6U type can lead to very serious consequences.

This cable does not stand up to any criticism - the outer insulation can be torn off by hand; breaking the insulation at least in one place leads to the fact that the inner sheath of the cable is filled with water! The use of bimetal as a material for the central core leads to corrosion in the first season. As a result of external factors, the cable may fail in a week (there have been cases!) After installation. Professionals in the field of satellite reception will advise you to use a cable from the Italian company Cavel, which is an order of magnitude more expensive than a proven cable from domestic manufacturers, also suitable for use.

The most common malfunction of a satellite receiver is a malfunction of the power supply, as the most unreliable part of any electronic equipment. The power supply generates voltages to power the internal circuitry of the receiver as well as to power the external LNBs and the drive (if installed). We start repairing the power supply unit by checking the fuses and protective breaking resistors. Burnout of these parts does not necessarily indicate a malfunction of the circuit - it may have happened as a result of a surge in the AC mains, or these parts originally had a manufacturing defect. If the malfunction was not eliminated, we begin to "dig" further. To do this, consider the principle of operation of a pulsed power supply unit on a block diagram.

The equipment of European manufacturers in this regard is certainly out of competition (in comparison with Chinese) - the simplest receiver shown in the picture (with the cover removed) from the German company Golden Interstar has been working without repair in my dacha for many years. Consider all the above criteria for choosing equipment and you will not have to repair it!

Hello, today we will try to fix the Tricolor receiver. Many faced such a problem when the warranty (usually 12 months) expired and the receiver suddenly failed. A new one is expensive, and in most cases the repair will not be difficult and will cost a penny, if you are even a little friends with a soldering iron, the main and most common faults are easy to fix yourself. Let's consider such a repair on the example of another receiver from the Tricolor company GS-8300 N. I must say, the device is not of the best quality, and the money that Tricolor takes for it, of course, is not worth it. But, nevertheless, the number of subscribers is large and not all of them work for a long time and regularly.

The main and most common malfunction of all receivers is a malfunction in the power supply and voltage conversion circuit.Also, the modulator often fails due to a short circuit in the coaxial cable from the LNB, although the latest models have good protection against short circuits in the cable, when triggered, the voltage supply to the converter simply stops until the short circuit is eliminated.

And so, our receiver does not show any signs of life, the indicators on the front panel display do not light up, and no twitching of the power plug from the outlet and turning on the toggle switch does not help us (at least that was the case with the device, an example of which is given in this article) ... The first thing we do is pull out the plug from the network and remove the top cover, we need to get to the electronic filling of the device. And here it is important to remember one thing, namely about the warranty seal, which we will of course break if we remove the cover. Therefore, once again make sure that the warranty period has definitely expired, and under warranty no one will repair it for you. If the warranty is still valid, I advise you to take the receiver to a service center and entrust this matter to a specialist.

Receiver inside:

The electrolytic or oxide capacitor at the input often dries up and fails, which is also a malfunction, not everyone can find such a breakdown either, you need to have at least an initial level of a radio amateur. Usually, defective capacitors are swollen, yellowish, or have a small brown speck on the board at the base of the legs. Also, the serviceability of a capacitor can be determined by comparing its nominal and measured capacitance.

The receiver uses direct current, which is rectified from the AC mains using a diode bridge. Problems with the diode bridge also happen. It is very simple to check diodes, the main function of a semiconductor diode is to pass current in one direction, and not in the other. In my case, the transistor of the primary winding of the transformer turned out to be faulty, it is not difficult to find it, it usually has a radiator to remove heat. I determined the malfunction of the transistor by measuring the voltage at its emitter, it was absent there, the primary winding was not powered, respectively, everything else is de-energized. The transistor cost me 28.5 rubles. Replacing it with a soldering iron, I eliminated the malfunction and the receiver is back in working order. I must say such a breakdown is quite a rare occurrence, usually it all ends with a fuse.

A very common malfunction is a firmware crash. The firmware often crashes, this is usually evidenced by the complete hang of the receiver. In this case, "flashing" will help. I will say about one more reason for the malfunction, which may arise due to poor-quality installation. Water in the cable. If the outer insulation of the cable is broken, then water from atmospheric precipitation can get inside, it easily enters the receiver like a hose, sometimes flooding all of its insides. The condition of the cable must be monitored throughout the entire service life of the device.

In this article, we will fix the most common breakdown in a satellite receiver, namely, we will repair the power supply of this device. Why a power supply? Yes, because in 95% of cases of failure of the receiver, the power supply is the culprit. The receiver may not turn on at all, it may turn on "halfway" (for example: the red indicator is on, and the green one, despite our efforts when pressing a certain button, does not turn on and there are many more signs), or some function may not work. And the reason for all these misunderstandings, in most cases, can be the power supply. We will repair the SVEC receiver, but functionally, on most of these devices, the power supplies differ only in the shape and location of the radio elements. The principle of repairing receivers is almost always the same.

So, let's begin. To begin with, of course, you need to disassemble our "unit". We unscrew the screws or bolts on the sides of the cover and remove it. We are presented with the following picture:

Now we will visually inspect the unit and the board for the visible reasons for the breakdown (this can be "swelling" of capacitors, burnout of the board or individual elements, etc.). If no apparent reason is found, then we look at the fuse. Even if it is not visually visible that the fuse has "blown", it is better, nevertheless, to check its integrity with a device. If the fuse is not working, do not rush to change it and try to turn on the receiver. Usually they just do not "burn out", on the contrary, for the most part, with overvoltage in the network, they remain unharmed, and something else must fail. This is how modern technology works. In general, we need to remove the power supply (in the figure it is marked with a blue arrow) from the receiver in order to check other items.

First of all, you need to check the power capacitor: there may be a residual charge in it. If there is a charge in the capacitor, it is imperative to discharge it, otherwise, when checking other radioelements, we can not only "burn" the device, but also get a good electric shock, albeit not fatal, but still unpleasant.

After that, we proceed to check the main transistor, which stands on the radiator. If we discard all professional terms, then we simply "ring" him for a "short circuit". These transistors are constantly failing, they are designated like this: D13009K. The literal values ​​can be different, but the numerical values ​​must be the same. This transistor is found in many receivers, but not all. In others, there are similar ones or there may be microcircuits. This is not the point, it is important that in most cases, it is the power transistors or microcircuits that fail.

On our power supply, after checking this transistor, a short circuit was found between its contacts. It follows from this that the transistor is "burnt out".

Now we need to unsolder it and check the rest of the radioelements. I will explain the check in a simple way: you need to check all the transistors and diodes (zener diodes) for a "short circuit".

All parts marked with arrows in the picture must be checked for "short circuit". After such a check, I found a "burnt out" diode, which is powered by 5V. We also need to remove it, so that, like the transistor, we can replace it with a usable one.

Next, we solder the new transistor and diode into place. Then you can check our power supply. We do it like this: insert it into the receiver and connect only the power cord and the power button to it. We DO NOT connect the loop with wires that goes to the board with processors. We will check by the output voltages, the value of which is indicated on the power supply, near the "socket" where the loop is inserted.

We measure the voltages at the output of the power supply and, if they coincide with the values ​​on the board, you can connect a loop.

Everything. Now we fasten all the bolts that secure the power supply to the receiver and close our device with a lid. Ready.

Of course, the most common and not difficult type of breakdown is described here. There may be more serious reasons for the failure of this device. Then, without the intervention of a specialist, it is impossible to do, but without doing anything, it is impossible to learn something.

Thank you. Very interesting article. Everything is clear and simple.

Thank you for your feedback and participation in the life of the site!

Hello, I have such a problem, the receiver turns on, but when the cable is connected from the WORKING antenna, there is no signal or quality. I opened the receiver. Not one condenser is swollen, what could be the problem?

I only repair power supplies in receivers, but I don’t climb into the main board, so I can’t help. But I can assume that this is a tuner or firmware.

Hello Victor, I have such a problem. I got the same svec A8 receiver as a gift. The power supply unit was not in working order. The D13009k transistor failed, I replaced it with J13009k and the power supply unit came to life, but it turned out that the U5 transistor was missing on the main board. Could you please write and photograph its marking. I would be very grateful for your help.

Hey! U5 is an LM317 regulator, the same as U24.

Hey! Thank you so much for your reply. And then I climbed the whole Internet and did not find a scheme from him. I will solder and try to run.

Hello. Globo 4100c the red indicator flashes when the button is pressed up lights up 8. Visually, everything is in order in the power supply unit. What should be changed first in it?

Hey! Check the output voltages from the power supply, the stabilizers on the main board.

Hello. There is an Orton 4050c tuner. After disconnecting from the network, it did not start. The display shows a flashing red light and flashing numbers. Having disassembled, I did not find any swollen canders. But I found out a bad soldering (something was wobbling, something just fell off when I touched it) Soldered. I measured the output voltages on the removed BC. There is. 3.3v. 5v. 12v. 22v. True, my DT-832 tester shows slightly overestimated readings (3.5v 5.5v 14.3v 24.2v). But when connected to the board, 3.3v and 5v disappear. The display turned off. The same. I can't figure out where to dig. Can anyone help. Thanks in advance.

Hey! Look at the stabilizers on the main board.

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After a thunderstorm, the processor usually crashes or the firmware flies.

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Satellite TV is evolving with every update and with every new device. Every satellite TV user from time to time encounters problems and errors in the robot of his receivers or other components. This can be due to various factors. For example, older models may fail due to long operating times. Despite their quality and reliability, devices can break down due to unsatisfactory weather conditions, electrical problems or improper use. Let's take a closer look at this.

Among the reasons for the breakdowns of the GS8306, GS8300, DRS-5001 models are the following:

• the receiver does not start;
• the timer flashes on the display of the set-top box at startup;
• on the display of the prefix only a non-blinking timer;
• on the display of the prefix the inscription "boot";
• on the display of the prefix error message ER31;
• an error on the TV display when switching on "Short circuit!" or "Check antenna cable".

In the case of the last error, you can carry out diagnostics yourself to clarify the cause of the malfunction. When the wire was disconnected, the error message disappeared, the problem is with the satellite converter or the antenna cable. Next, you need to check the wire in case of a short circuit. If it is not there, there is an error in the satellite converter. But, if the TV still signals an error, the problem is in the tuner.

These types of breakdowns include other representatives of the series of MPEG-2, MPEG-4 and Full HD set-top boxes. There is no need to prematurely go to the store for another device, because the purchase will definitely cost a lot. It is recommended to contact service center for qualified help, or repair the receiver with your own hands, if you have the necessary skills.

Diagnostics show that often the components of the set-top box fail:

• firmware - this can be detected if you see errors on the display;
• receiver power supply Tricolor - when the receiver does not turn on or the timer is flashing;
• motherboard - only timer is displayed or in case of error ER

However, satellite TV users may encounter picture, sound or signal problems. This also happens due to problems with the receiver. The following are attributed:

• breakdown of the satellite converter;
• the antenna cable is damaged;
• breakdown of the tuner unit;
• weak signal due to obscuring trees;
• unsatisfactory weather conditions.

The reasons also include channel broadcasting frequency change or even a whole package of channels or satellite malfunctions, to which the service center has nothing to do.

First of all, you do not need to start repairing Tricolor receivers yourself if you are not 100% sure what and how you are doing. If the warranty period is valid, it is best to entrust the repair of the Tricolor satellite receiver to a specialist.But, this is possible if there is a warranty card, purchase receipt, client's signature. The repair warranty may be voided if:

• operation of the receiver during power surges;
• damage to the seal or the integrity of the structure;
• mistakes when switching, connecting cables or incorrect programming;
• the receiver was not installed by an installer, and this led to a breakdown during operation;
• the client has violated the terms of use;

All this must be adhered to if the client wishes to repair his receiver in the future.

Repair of the Tricolor TV receiver is as follows:

• replacing the motherboard;
• changing the power supply;
• replacement of the module;
• flashing or reinstalling software.

If the motherboard breaks down, it is most often recommended to buy a new and more modern version of the set-top box, because repairing the motherboard will cost almost at the price of a new receiver.

For example, there are a number of errors typical for each type of device and options for correcting. The peculiarity of the repair of the GS8300 receivers of the Tricolor company depends on the alteration of the power supplies, because the devices are not highly resistant to voltage surges. Overheating was a typical problem for the GS 7300, causing the diode bridge or chip to break. Also, the power supplies for the Tricolor receivers sparked after prolonged operation, so they often had to be changed. The most optimal model, the GS8306, also had typical problems. For example, overheating during prolonged viewing of channels.