DIY repair 8300

Hello everyone. Today I will show the solution to how it turned out to be a common problem. One fine morning, about to watch TV, I was upset by a black screen. Looking at the receiver of the tricolor, he noticed that he seemed to be dead. 🙂

The GS8300N receiver did not respond to power supply (LEDs did not light up). Since the warranty ended long ago, I began to disassemble this device. The picture was unpleasant, the receiver's power supply burned out. This receiver, like the TV, was powered through a voltage regulator from the date of purchase, however, this did not save it.

The power supply capacitor dried up and swelled, several radioelements burned out from overheating.

In order not to breed plagiarism with the text, I will post a video that helped me quickly repair the receiver's power supply. It describes the repair process in detail. In addition, the circuit has been slightly redone and works great.

I will show you the cost of repairs, and then decide for yourself whether it is worth it or not.

• Microcircuit - 60 rubles
• Diode - 2 rubles.

If the arms are straight, then it's worth it!

After checking the diodes, I found one broken.

And here it is, the video! 🙂

If it came in handy, I'm always glad for thanks. If something is not clear, I will definitely answer in the comments. I got it right the first time and this redesigned circuit works fine.

In this article, we will repair with our own hands Tricolor receiver... Often the problem arises that the warranty period has expired and the receiver suddenly breaks down. Buying a new receiver is expensive, carrying it to a service center means depriving yourself for a long time watching satellite TV... But in many cases, the breakdown of the device can be corrected independently, without spending much effort and a lot of money. If you know how to solder, then it is easier to figure out the faults yourself and fix them.

As an example, we will use the Tricolor TV receiver GS-8300 N. It should be noted that the quality of the receiver leaves much to be desired, since it costs decently. Nevertheless, many subscribers use this particular receiver, and not all of them work properly.

The main and most common problem with most receivers is a malfunction in the power supply and voltage conversion system. In addition, a short circuit in the coaxial cable from the LNB will often cause damage to the modulator. Only in the latest models they began to use good protection, which, when closed, stops supplying voltage to the converter until this short is removed.

So, there was a problem: the receiver does not turn on and does not show any signs of life at all, and the indicators on the front panel are off. We tried to twist the plug from the socket, turn on / off the toggle switch - it does not help.
Then let's understand further. First, be sure to unplug the plug and remove the top cover with a screwdriver. We need to look at the electronic stuffing of the device. It is important to remember here that when removing the cover, we will definitely break the warranty seal.
Therefore, if the warranty period has not yet expired, it is better not to climb yourself, otherwise you will not be able to repair your receiver under warranty later.
And if the guarantee has passed and you have no one to hope for, then go for it - break the seal.

Removing the cover reveals circuit boards with various components. They are interconnected by wire busbars. The photo shows some devices with a description. We need to find the power board. It has a transformer and an inlet for the power cord, so it's not difficult to find it. The first thing to look out for is the fuse, which is usually installed at the beginning of the circuit. The fuse can take many forms, such as a glass capsule with a conductor or a small plastic box that contains the fuse.In the second case, you must first remove the cover of the box (you can use tweezers or tweezers) to get to the fuse itself. Next, you need to check the fuse for a break with a tester or multimeter. If it blows out, which often happens, then go to the radio store, buy the same fuse and just change it. If everything is fine with the fuse, then we check further along the circuit.

Another element that often breaks down is the transformer itself. Such a fault is detected by measuring the voltage on the secondary winding. It is worth noting that not everyone can do the replacement of the transformer. If you are not sure that you can change it yourself, then it is better to take your receiver to a repairman, and if this does not seem difficult for you, then go for it.

Another malfunction is the failure of the electrolytic or oxide capacitor at the input due to drying out. To detect this breakdown, you need to understand at least a little bit of radio mechanics. A defective capacitor is usually yellowish in color, and a small brown spot can be observed at the base of its legs on the board. In addition, you can compare the rated and measured capacitance of a capacitor to determine if it is working properly.
The diode bridge in the receiver converts the AC mains current into direct current.

The diode bridge can also break. This is easy to check, since a semiconductor diode has one main function: to pass current in one direction, but not in the other.

In the case we are considering, a breakdown occurred with the transistor of the primary winding of the transformer. It has a heatsink to dissipate heat, so it's pretty easy to find. The malfunction was detected as follows: the voltage at the emitter of the transistor was measured, it was not there, the primary winding was not powered, which means that all other parts are de-energized. The cost of the transistor is about 30 rubles. To replace it we need a soldering iron. We eliminate the malfunction, and - "Hurray! It works! " - the receiver is ok again. Note that the transistor does not break down often, mainly receivers fail due to a fuse.

Let's consider another very common malfunction - firmware crash. This happens quite often. A sign of a firmware rally is a complete hang of the receiver. Then we just need to reflash the receiver.

Poor-quality, unprofessional installation can also be the cause of receiver breakdown. If the outer insulation of the cable is broken, then rainwater or snow can easily penetrate into the cable and, like a hose, seep into the receiver, filling all its internal contents. Therefore, you need to monitor the cable, whether there are any kinks or insulation faults.

Those who do not understand anything about the internal structure of satellite receivers, or who have no time to deal with this at all, should not despair if the device breaks down. Service centers have not been canceled yet. There you can contact with your problem and the specialists will help you solve it.

Receivers fail for various reasons - this is a voltage drop, and the wear of the device itself due to intensive use, and the failure of certain elements. This also includes breakdowns due to owners who themselves decided to figure out the problem without having special skills, for example, they incorrectly replaced the firmware in a satellite or cable receiver.

The power supply is perhaps the most breakable part of a receiver. The power supply unit may break down due to a poor-quality supply network, due to poor-quality radio components (especially on cheap Chinese equipment).

Dust and dirt can also cause the receiver to break, creating an incorrect thermal regime.

The service center repairs and maintains various satellite equipment. Moreover, the repair is carried out by specialists and on professional equipment. Almost any defective part can be replaced with a new one. Repair times will depend on the availability of parts at the service center. If any part is missing, then it will be ordered from suppliers, which will take some time.But in large, serious centers, usually, parts are always in stock.

Consider another situation: the receiver failed after a power surge. After opening the cover, the following parts were found to have burned out:

• network capacity C5 - 47µFx400V
• Q1 - CS2N60F
• R8, R11, R13 - 3 Ohm each (frame size 1206)
• R9 - 47 Om (1206)
• U1 - no type defined

On the Internet, we found a page with a table on the identification and selection of analogs (for example, https://my.housecope.com/wp-content/uploads/ext/2561/ic_power/), using it we look at what we have and what we don’t have. We will replace the last part with SG6848 to minimize interference with the factory circuit.

We carry out dismantling of faulty parts (circled in red in the photo):

• U1
• R8, R11, R13 - 3 Om (1206)
• R3, R6 (one of them is possible) - 1 MOm (1206)
• C3 - 68nF
• R25 - 3.6 kOm (0805)
• R26 - 10 kOm (0805)

Installing new parts:

• instead of U1 - SG6848
• instead of R8, R11, R13 - one resistor 1.8 Om x 0.5W
• instead of C3 a 100 kOm resistor (1206)
• instead of R26 a 33 kOm resistor
• instead of R25 we select a resistor in the range of 10-12 kOm, controlling the voltage 3V3 at the cathode VD8, we will stop at the nominal value of 11 kOm, U = 3.36V (at 10 kOm U = 3.28V, at 12 kOm U = 3.41V)
• instead of the burnt out Q1 - SSS4N60B (TO-220F package).

From June 28, 2011, all Tricolor TV subscribers using the GS-8300, GS-8300M and GS-8300N receivers need to update (software) via satellite to version 1.0.157.

Hello, today we will try to fix the Tricolor receiver. Many faced such a problem when the warranty (usually it is 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 of course we will 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, it easily, like a hose, gets into the receiver, sometimes flooding all of its insides. The condition of the cable must be monitored throughout the entire service life of the device.

Written by Administrator on 07 December 2011.

Hello, today we will try to fix the Tricolor TV receiver with our own hands. Many faced such a problem when the warranty (usually it is 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 using the example of another GS-8300 N receiver from the Tricolor TV company. I must say that the device is not of the best quality, and of course, Tricolor TV is not worth the money that Tricolor TV takes for 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 of course we will 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.

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 have a yellowish appearance, or 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 also want to say about another cause of 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 and 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.

Electronic devices surround us everywhere: on the street, at work, at home. With the rapid growth and availability of satellite television to the general public, a wide range of satellite equipment has emerged for the general public. These are satellite receivers, conditional access modules, antennas, converters, etc. Whether we like it or not, sooner or later breakdowns occur with them, which cause us to feel the loss of our beloved thing.

You should not despair - for this there are service centers that you can turn to and they will help you to bring your equipment back to life.

Breakdowns of equipment occur for various reasons - voltage drops, failure of various nodes, wear and tear of the equipment itself from its venerable age, you can also note the incompetence of the owners themselves, say, improper replacement of software in satellite and cable receivers.

Power supply failure is perhaps the most common type of digital terminal failure. It arises for various reasons: a poor-quality supply network (see photo), poor-quality radio components were used, especially this is de facto in Chinese technology.

Also, this can include a violation of operation, dust, dirt, as a result of this, the thermal regime is not correct (see photo).

A service center is a structural unit within a company. He is responsible not only for the repair and maintenance of products sold by our company, but also for the repair (including warranty) of satellite equipment from other companies. Our clients are not only individuals - users, but also equipment dealers who seek to save their customers from the problems associated with the repair and maintenance of receivers. Our flexible corporate customer policy allows us to provide adequate service and meet the interests of all customer groups. This is more than 1000 units of equipment per month. To carry out such large volumes, of course, allows the professionalism of the employees, the equipment of the service center with professional equipment, tools and technical documentation. Therefore, in our service center we carry out high-complexity repairs: for example, replacing processors in BGA cases. Repair takes place in the shortest possible time.

The supply department, in addition to its main function - the purchase of equipment, is also engaged in meeting the needs of the service center, purchasing components necessary for repair. And here it is worth noting that the selection and purchase of components for repair is carried out according to the following criterion: the quality of parts comes first, their price comes second, but due to the large volumes of supplies of parts, the price ultimately remains low.
All orders are processed electronically and registered in the database. This makes it easy to track the various stages of the repair process. A guarantee is provided for the work performed.

Of course, unforeseen moments happen - for some reason, the repair is delayed. This usually happens due to the lack of some scarce radio component. Sometimes repairs require a complete replacement of the motherboard, and this repair part is not always available. In this case, we are trying to find some acceptable solution together with the client, taking into account his wishes, combined with our capabilities.

At autopsy, found out of order:
- network capacity C5 - 47µFx400V
- Q1 - CS2N60F
- R8, R11, R13 - each with a nominal value of 3 Om (frame size 1206)
- R9 - 47 Om (1206)
- U1 - it was not possible to determine its type by the marking on the case.

According to the table on identification and selection of analogs https://my.housecope.com/wp-content/uploads/ext/2561/ic_power/, the last part was replaced with SG6848 with minimal interference with the factory circuit.
Dismantling: (circled in red in the photo)
- U1
- R8, R11, R13 - 3 Om (1206)
- R3, R6 (one of them is possible) - 1 MOm (1206)
- C3 - 68nF
- R25 - 3.6 kOm (0805)
- R26 - 10 kOm (0805)
Install:
- instead of U1 - SG6848
- instead of R8, R11, R13 - one 1.8 Om x 0.5W resistor (the usual output one, since I did not find the smd of the required rating))
- instead of C3 a 100 kOm resistor (1206)
- instead of R26 a 33 kOm resistor
- instead of R25, we select a resistor in the range of 10-12 kOm, monitoring the voltage 3V3 at the cathode VD8. I settled on the nominal 11 kOm, U = 3.36V (at 10 kOm U = 3.28V, at 12 kOm U = 3.41V)

SSS4N60B (TO-220F package) was installed instead of the burnt-out Q1

On Telesputnik posted a diagram of the power supply unit.

There are inaccuracies:
1. The lower terminal of the primary winding must be connected
to the junction point of the anode D6 and drain Q1
2. Positional designations C2 and C3 are incorrect. C3 must be connected to the 3rd pin
U1, C2 to the 4th pin of U1.
3. Nominal C3 = 68nF
4. In the diagram, there are two capacitors C1
5. Missing C12
6. The primary land is designated in the same way as the secondary one.
7. Missing C8
8.Q2 - MOSFET NTD14N03R
9.Rated C11 = 2200pF
10. Type D8 = SR560
11. Positional designations U3 and U4 are incorrect - they must be reversed.
12. Denomination C5 = 47µF

The receiver turns on, the LNB has 18 volts. There is no video signal, it gets very hot (the finger does not hold) stv 6419 .. because of it there can be no video? there is no other point? (in the sense that more video signal is not to be taken from?) the receiver switches channels ..

Receiver GS 8300N there is no video and audio signal through scart to the TV, the channels are switched on the receiver panel.

the video signal from the STi5119ALC chip can be checked with an oscilloscope at the control point opposite the capacitor C117, then it comes to the resistor R87 and is transmitted to the capacitor C129 and then goes to the STV6419 microcircuit from it there is no output to R91, the culprit is not 12 volts on the board, respectively, there is no power + 12V on the 3rd leg STV6419, a 12 volt Zener diode D3 is faulty near the power connector

There was such an answer: if you use only composite video signal, most likely it can be simply thrown out (replaced with a jumper). And where to put the jumper? if that's the right advice ..

Defective VD3 (VD3 zener diode 12 V) on the motherboard next to the power connector.

Zener diode brand and parameters:

Power supply + 12V for 3rd leg STV6419.
Along the chain: XP5 connector 9th leg -> R81 (300 Om) + Zener diode VD3 (12V) = stabilizer + 12V -> L3 -> 3rd leg STV6419.

Zener diode analog:

VD3 STV6419 similar Zener diode (SMD) did not find. Put a 0.5 watt glass zener diode the size of a diode kd522 ... While the flight is normal.

If replacing the zener diode did not help:

After the thunderstorm, 6419 swelled. After the replacement, the image did not appear, but when checking the strapping, two resistors were cut off, R91, R95... I replaced it, and it worked.

One more problem:

And yet, instead of 13, 18 Volts, 24V was running on the LNB. Replacement required DA1 (LM317T)... And that's it, the flight is normal

The same situation with the GS-8304 receiver:

After 5 years of operation, the GS-8304 suddenly stopped broadcasting, although the indication is working properly.
Zener diode struck at short circuit. Zener diode brand MMZE5242B.

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The Ferex R&D FP09T001 Rev.2 power supply for receivers is assembled according to the circuit of a pulsed flyback voltage converter shown in Fig. 12. Input mains alternating voltage 190 ... 240 V with a frequency of 50 or 60 Hz through a fuse-link F1, a noise suppression filter C1LF1, which prevents the penetration of noise from the source into the network, a current-limiting resistor RT1 and a diode bridge D1-D4 are fed to a smoothing capacitor C5.

The series resistor RT1 limits the inrush current through the diode bridge D1-D4 while the capacitor C5 is charging. Varistor RV1 protects the source from overvoltage. When the supply voltage exceeds the permissible value, the resistance of the varistor decreases, the current flowing through it increases and the F1 fuse burns out.

The rectified direct voltage passes through the control unit to the primary winding of the transformer T1. It is switched by a powerful field-effect transistor Q1, which is controlled by the PWI controller U5. The energy stored in the transformer is transferred to the secondary windings and rectified by diodes D5. D7-D9.

To start the power supply when connected to the network, a rectified voltage is used, coming through the current-limiting resistors R4, R5 to pin 5 of the U5 microcircuit. After starting, a voltage appears on the secondary windings of the transformer T1, and the U5 microcircuit is powered by the voltage rectified by the diode D5, through the current limiting resistor R19.

The stabilization of the output voltages of the power supply is provided by the elements U2 (optocoupler, galvanically decoupling the primary and secondary circuits of the source) and U3 (voltage stabilizer). The rated values ​​of the output voltages are set by the divider R25R26. When they increase during operation, the transistor in the optocoupler U2 opens, and the ShI controller U5 decreases the duration of the pulses that open the transistor Q1.

As a result, the energy transferred to the secondary circuits decreases and, consequently, the output voltages decrease. On a powerful field-effect transistor Q2 and a microcircuit U4, a linear voltage stabilizer of +5 V is assembled. Its nominal output voltage is set by the divider R35R38. The external view of the power supply is shown in Fig. thirteen.