Repair of the receiver Tricolor GS8300

Hello. 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 radio elements 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 details the repair process. In addition, the circuit has been slightly redone and works great.

I'll 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.

Here is the original diagram of the receiver's power supply.

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.

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Repair of the tricolor GS8300 receiver. Alteration of the power supply. A typical malfunction of the tricolor gs8300 receiver is very common and consists in the failure of the power supply. Repairing this power supply is sometimes quite difficult due to the fact that there is no original PWM controller chip. But it can be converted to another available 5L0380 microcircuit with changes in the installation of the power supply. Release partner TAGGSM.RU http://goo.gl/rUoVNb TexRemont - a simple solution to computer problems Many users in the event of a breakdown of a computer, laptop or LCD TV immediately turn to specialists who can repair it all. On the one hand, this is correct, but on the other hand, the cost of even the simplest repair, such as replacing the BIOS battery, will not be minimal. Therefore, for users who are not afraid to pick up a soldering iron and a screwdriver, a special channel has been created https://www.youtube.com/user/texremont1. When a laptop or tablet malfunctions, not everyone knows the intricacies of not only the repair and the procedure for disassembling devices. On the TexRemont channel you can watch hundreds of videos dedicated to this issue. They contain video instructions in which professionals show in detail the features of working with a variety of models of laptops, video cards and motherboards from different manufacturers. At the same time, the main problems and ways of solving them that may arise during operation are described. A detailed description of the disassembly of laptops and tablets of various brands from different manufacturers can also be viewed without any problems. Not everyone can boast of one. That he knows how to work with such a rather simple device as a soldering iron, especially a soldering station. The peculiarities of using modern infrared stations are described on the TexRemont channel, and at the same time, you can always watch detailed video tutorials of work related to such an important feature as chip reballing, which is the basis of modern precision electronics. Repair of computers and their components is a rather complicated and time-consuming process that requires skills and experience. The TexRemont channel describes in detail the basic actions in those situations when a computer fails at the hardware level. The channel describes in detail the features of modernizing computers, connecting various devices and gadgets. Hundreds of videos will help a novice electronics engineer choose the right equipment for the repair of computer and digital equipment and teach how to work with it. A detailed description of modern technologies of soldering and installation of equipment will teach anyone who wants to independently repair laptops and computers. Our partner youpartnerwsp

The GS 8300 is the first receiver in the Tricolor TV receiver line that supports the MPEG-4 compression format and the DVB-S2 broadcast standard. This is the first receiver to accept over 150 channels. We can say that a new era of receivers for receiving Tricolor TV began with him. It's funny, but it began, like many receivers for Tricolor TV, with problems of a different nature. Either the receiver was activated for a long time, then the card did not see ...

But. As a result, the stability of the receiver was improved with new firmware. This material is not about the troubles of the GS 8300 receiver, but about what it consists of. Let's consider.

We can say that on this receiver the manufacturer got his hand in the production of MPEG-4 DVB-S2 operator receivers. And judging by the number of GS 8300 receivers in the hands of users, this experiment was a success. The GS 8300 receiver is equipped with a removable access card, but the GS 8300M receiver does not have an access card - the chip is wired into the receiver itself.

The receiver is built on a processor STi5119, FLASH memory with a volume of 4 MB, RAM only 16 MB - a ridiculous amount in comparison with the GS 9303 or GS U510. But the class of the receiver is different, because the 8XXX series does not support channels in HD format.

So. below is a photo of the motherboard of the GS 8300 receiver. Both a general plan and close-ups of individual nodes. Maybe someone will find such photos useful.

GS 8300 - general view of the board

And now different nodes close up

And in the photo below the capacitor of the power supply. The power supply unit fa photo is no longer native, but after replacement. And the capacitor used in it is of a higher quality than in the original PSU. Although the ratings of the capacitor itself are the same.

And here's another element. You can unsubscribe in the comments about its appointment. I myself did not delve into this question.

This is how I got a swoop photo review of the receiver filling for Tricolor TV - GS 8300. That's all for this.

October 2012. During the week, 15 pieces of GS-8300 were brought with dead power supplies, right up to blown up tracks, cracked PCB and burnt SMD resistors.

hover your mouse over the image to enlarge it

How everything happened is clear - the electrolytic or oxide capacitor at the input (C5) dries up, gives ripples, but so far everything works. The transistor of the primary winding of the transformer (Q1) overheats, SMD parts burn out around it, the board tracks crack and the power supply becomes faulty.

Native power supplies ran out long ago, and GS-8300 receivers kept coming and going. Of course, repair was possible by fusing tracks, installing jumpers, soldering parts - in short, it was possible to restore the power supply from the ashes and at the same time it would work properly, although the work did not look very aesthetically pleasing and the client was better off not seeing the result of the master's actions. And, of course, it took a lot of time to repair each unit.

Therefore, I went the other way - I took it and adapted it for the GS-8300 receiver, but I'll just make a reservation that there are several models of power supplies for the DRE-5000, the left one is suitable in the photo below - it is also the most common (the right one in the image does not pass in height )

Pinout of DRE-500 and GS-8300 connectors

No. DRE-5000 GS-8300

So, what needs to be redone in the block is to remove the 8th and 10th wires from the block and cut them off from the power supply unit itself (we do not throw out one of them, it will be useful to us later), cut off the place of the block for the 10th wire with a knife, total our connector has become 9-pin, the 7th wire is rearranged into slot 8, the cut wire is inserted into slot 7 and soldered to wire 6. Total - we get the GS-8300 connector, although instead of 24V we will have 22V, but this insignificant and tested over the years - does not affect the result.

Further, mechanical adjustment of the power supply unit - we break out the place for the com port socket with pliers, with the same tool we reduce the block length by 3-5 mm. And finally, we transfer the capacitor C1, making room for the power switch

We connect the network wire. We insert the block, placing an insulator - you can plastic from the bottle, fasten it with one screw, the second attachment point is a groove on the body. ready, it remains to close the lid

Thus, about 300 receivers were repaired, in two years one return - C17 was knocked out

Repair GS-8300

In this article we will repair the "tricolor" receiver with our own hands. A common problem is that the warranty period has expired and the receiver suddenly breaks down. It is expensive to buy a new receiver, to carry it to a service center means to deprive yourself of watching satellite TV for a long time. 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 GS-8300 N Tricolor TV receiver for television. It should be noted that the quality of the receiver leaves much to be desired, as it costs decently. Nevertheless, many subscribers use this particular receiver, and not all of them work properly.

we will use a receiver for television "Tricolor TV" GS-8300

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 the voltage supply 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 doesn't 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.

Tricolor TV GS-8300

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 with a tester or multimeter for a break. If it burns 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 it does not seem difficult for you, then go for it.

Internal structure of the receiver

Internal structure of the receiver

Internal structure of the receiver

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 know at least a little about radio mechanics. A defective capacitor is usually yellowish, 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: they measured the voltage at the emitter of the transistor, 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, 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 your problem and the specialists will help you solve it.

Receivers fail for various reasons

Receivers fail for various reasons - this is a voltage drop, and wear of the device itself due to intensive use, and the failure of certain elements. This can also include 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 the receiver. The power supply can break 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 fail, creating an incorrect thermal regime.

Dust and dirt in the receiver can also damage the receiver.

The service center repairs and maintains various satellite equipment. Moreover, repairs are 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, 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

R8, R11, R13 - 3 Ohm each (frame size 1206)

R9 - 47 Om (1206)

U1 - type not defined

On the Internet, we found a page with a table on the identification and selection of analogues (for example, http://remont-aud.net/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 dismantle faulty parts (circled in red in the photo):

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 children

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 \u003d 3.36V (at 10 kOm U \u003d 3.28V, at 12 kOm U \u003d 3.41V)

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

Installing new parts in the receiver

Power supply diagram GS-8300