home › Firmware › Gs 8300 power supply repair. Repair of tricolor GS8300 receiver. Reworking the power supply. Here is the original circuit diagram of the receiver power supply

Gs 8300 power supply repair. Repair of tricolor GS8300 receiver. Reworking the power supply. Here is the original circuit diagram of the receiver power supply

Repair GS-8300

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

As an example, we will use the Tricolor TV GS-8300 N television receiver. It is worth noting that the quality of the receiver leaves much to be desired, since it costs a decent amount. However, many subscribers use this particular receiver, and not everyone has it working properly.

We will use the Tricolor TV GS-8300 television receiver

The main and most common problem with most receivers is malfunctions in the power supply system and voltage conversion. In addition, a short circuit in the coaxial cable from the LNB often causes the modulator to break down. Only in the latest models have they begun to use good protection, which, when shorted, stops the supply of voltage to the converter until this short circuit is eliminated.

So, a problem arose: the receiver does not turn on and shows no signs of life at all, and the indicators on the front panel do not light up. We tried pulling the plug out of the socket and turning the toggle switch on/off - it didn’t help.

Then let's figure it out further. First, be sure to unplug the plug from the socket and remove top cover using a screwdriver. We need to look at the electronic components 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 try it yourself, otherwise you will not be able to repair your receiver under warranty later.

But if the warranty has expired and you have no one to rely on, then go ahead and break the seal.

"Tricolor TV" GS-8300

Removing the cover you will see printed circuit boards with various components. They are connected to each other by wire buses. The photo shows some devices with descriptions. 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. The first thing you should pay attention to is the fuse, which is usually installed at the beginning of the circuit. The fuse can take different forms, such as a glass capsule with a conductor or a small plastic box in which the fuse is placed. In the second case, you must first remove the lid 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 breakage. If it blows, which often happens, then go to a 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 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 replace a 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.

Receiver internals

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 have at least a little understanding of radio mechanics. A faulty capacitor is usually yellowish in color; there may also be a small brown spot on the board at the base of its legs. You can also compare the rated and measured capacitance of the capacitor to determine its health.

The diode bridge in the receiver converts alternating mains current into direct current.

The diode bridge may also break. This is not difficult 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, the breakdown occurred with the transistor of the primary winding of the transformer. It has a heatsink to dissipate heat, so it's quite easy to find. The malfunction was discovered as follows: we 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 were de-energized. The cost of the transistor is about 30 rubles. To replace it we need a soldering iron. We fix the problem, and - “Hurray! It’s working!” - the receiver is ok again. Note that the transistor does not break down often; most receivers fail due to a fuse.

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

The cause of receiver failure can also be poor-quality, unprofessional installation. If the external insulation of the cable is broken, then rainwater or snow can easily penetrate inside the cable and, like a hose, seep into the receiver, flooding all its internal contents. Therefore, you need to monitor the cable to see if there are any kinks or insulation damage.

Those who do not understand anything about the internal structure of satellite receivers, or who have no time to figure it out at all, should not despair if the device breaks down. No one has canceled service centers yet. You can go there with your problem and specialists will help you solve it.

Receivers fail for various reasons.

Receivers fail for various reasons - voltage drops, wear and tear of the device itself due to intensive use, and failure of certain elements. This also includes breakdowns caused by owners who decided to figure out the problem themselves 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 power supply network or low-quality radio components (especially on cheap Chinese equipment).

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

Dust and dirt in the receiver can also cause the receiver to break down.

The service center carries out repairs and maintenance of various satellite equipment. Moreover, repairs are carried out by specialists and using professional equipment. Almost any faulty part can be replaced with a new one. The timing of repairs 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 available.

Let's consider another situation: the receiver failed after a power surge. After opening the lid, it was discovered that the following parts had burned out:

network capacity C5 - 47µFx400V

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

R9 - 47 Ohm (1206)

U1 - type not defined

We found a page on the Internet with a table on 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. Let's replace the last part with SG6848 to minimize interference with the factory circuit.

We dismantle the faulty parts (circled in red in the photo):

R8, R11, R13 - 3 Ohm (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 Ohm x 0.5W

instead of C3 there is a 100 kOm resistor (1206)

instead of R26 there is 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 settle on a nominal value of 11 kOm, U = 3.36V (at 10 kOm U = 3.28 V, at 12 kOm U = 3.41 V)

instead of the burned-out Q1 - SSS4N60B (TO-220F body).

Installing new parts in the receiver

GS-8300 power supply circuit

October 2012. Within a week they brought 15 GS-8300s with dead power supplies, including blown 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 standing at the input (C5) dries out and gives pulsations, but so far everything is working. The transistor of the primary winding of the transformer (Q1) overheats, burns out around it SMD parts, the board tracks crack and the power supply becomes faulty.

The original power supplies ran out a long time ago, but the GS-8300 receivers kept coming and going. Of course, repairs were 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 entirely aesthetically pleasing and it was better for the client not to see the result of the master’s actions. And, of course, it took a lot of time to repair each block.

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 one on the left is suitable in the photo below - it is also the most common (the right one in the image does not fit in height )

Pinout of DRE-500 and GS-8300 connectors

No. DRE-5000 GS-8300

	30 V	no/delete
	22 V	24 V
	12 V	frame
	frame

	3.3V	3.3V
	3.3V	3.3V
	frame	frame
	frame	frame
	frame	frame

So, what needs to be changed in the block - remove the 8th and 10th wires from the block and cut them off from the power supply itself (we don’t throw away 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, we move the 7th wire into socket 8, we plug the cut wire into socket 7 and connect it by soldering to wire 6. In total, we get a GS-8300 connector, although instead of 24V we will have 22V, but this insignificant and tested over the years - does not affect the result.

Next is the mechanical adjustment of the power supply - we use pliers to break out the space for the com-port socket, and with the same tool we reduce the length of the block by 3-5 mm. And finally we move capacitor C1, making room for the power switch

Connect the network cable. We insert the block, placing an insulator - plastic from a bottle, perhaps, fasten it with one screw, the second attachment point is a groove on the body. ready, just close the lid

About 300 receivers were repaired in this way, in two years one return was knocked out C17

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

We will use a television receiver as an example. It is worth noting that the quality of the receiver leaves much to be desired, since it costs a decent amount. However, many subscribers use this particular receiver, and not everyone has it working properly.

So, a problem arose: the receiver does not turn on and shows no signs of life at all, and the indicators on the front panel do not light up. We tried to pull the plug out of the socket, turn the toggle switch on/off, but it didn’t help.
Then let's figure it out further. First, be sure to unplug the plug from the socket and remove the top cover using a screwdriver. We need to look at the electronic components 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 try it yourself, otherwise you will not be able to repair your receiver under warranty later.
But if the warranty has expired and you have no one to rely on, then go ahead and break the seal.

Removing the cover reveals printed circuit boards with various components. They are connected to each other by wire buses. The photo shows some devices with descriptions. 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. The first thing you should pay attention to is the fuse, which is usually installed at the beginning of the circuit. The fuse can take different forms, such as a glass capsule with a conductor or a small plastic box in which the fuse is placed. In the second case, you must first remove the lid 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 breakage. If it blows, which often happens, then go to a radio store, buy the same fuse and just change it. If everything is fine with the fuse, then we check further along the circuit.

The diode bridge may also break. This is not difficult 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, the breakdown occurred with the transistor of the primary winding of the transformer. It has a heatsink to dissipate heat, so it's quite easy to find. The malfunction was discovered as follows: we 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 were de-energized. The cost of the transistor is about 30 rubles. To replace it we need a soldering iron. We fix the problem, and – “Hurray! It’s working!” – the receiver is ok again. Note that the transistor does not break down often; most receivers fail due to a fuse.

Let's look at another very common malfunction - a firmware crash. This happens quite often. A sign of a firmware failure is a complete freeze of the receiver. Then we just need a receiver.

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

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

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

Let's consider another situation: the receiver failed after a power surge. After opening the lid, it was discovered that the following parts had burned out:

network capacity C5 - 47µFx400V
Q1 - CS2N60F
R8, R11, R13 – each 3 Ohm (size 1206)
R9 - 47 Ohm (1206)
U1 – type not defined

We dismantle the faulty parts (circled in red in the photo):

R8, R11, R13 - 3 Ohm (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 Ohm x 0.5W
instead of C3 there is a 100 kOm resistor (1206)
instead of R26 there is 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 settle on a nominal value of 11 kOm, U = 3.36V (at 10 kOm U = 3.28 V, at 12 kOm U = 3.41 V)
instead of the burned-out Q1 - SSS4N60B (TO-220F housing).

Video review: repair of the Tricolor GS8300 receiver (no signal)

———————

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

SUPRA STV-LC42T400FL (V1N06)
Main HK.-T.SP9202P53

Backlight driver OB3350CP
Malfunction:
The backlight on the TV turns off, the sound and image remain, you can see it on the MENU matrix.
The backlight turns off randomly, the backlight may go out immediately, or it may work for half an hour. (according to the client)
In a workshop:
When it came in for repair, the TV worked for about 5 minutes and the backlight turned off.
The solution to the problem did not come immediately.
The first thing I thought of was LEDs!
Opened the lid, checked the voltage on the OB3350CP

All voltage is normal when the backlight is working!
When the backlight turns off, the voltage on leg 2 is 0 volts
I decided to open the panel to look at the LEDs...
Checking with the device did not reveal an exact result, it seems that all the LEDs are normal in terms of current, there is no big discrepancy, all the strips glow perfectly.
The only thing that alerted me and caught my eye was that the area around the diodes was clearly burnt, more noticeable on some strips, less noticeable on others.
In general, I installed all the strips on the panel again and turned them on without a matrix! Oopss... The LEDs blinked and did not light up.
But before I disassembled the panel, the backlight worked for two or three minutes and turned off.
Checked EVERYTHING again! No problems, everything is fine. I decided to check each LED separately for current consumption, but I did not find any critical differences.
Well maybe? The TV worked, he personally took it for repairs and, together with the client, saw the perfect image.
And now all the LEDs flash and immediately go out, the LED on the TV panel lights up green, that is, the TV remains in operating mode, you can turn it off from the remote control and turn it on again, then the backlight will turn on again and turn off abruptly, the time is no more than 2 seconds.
I checked the voltage on the OB3350CP driver again, everything is normal, except for the voltage on the 2nd leg, where it appears for a second and immediately disappears.
I decided that the problem was in the chip itself or in the LEDs. There was no such driver available, so I decided to replace the LEDs with new ones, fortunately I bought them recently.
Further, replacing the LEDs did not give any results, everything is the same, the backlight blinks and immediately goes out.
I bought two OB3350CPs, changed all two in turn, but the result was the same.
I decided that the problem was with the lane, but to clear my conscience I decided to check the entire OB3350CP harness again. I cleaned the glue on the backlight connectors, there are also resistors there, washed everything with alcohol and put everything under a microscope in a circle.... everything is fine!

Only one resistor raised doubts; according to the marking it is 01C (10 kΩ), but when tested for Ohms it behaves strangely, either increasing or decreasing to the norm of 10 kΩ.
Once again I washed everything and soldered this resistor and finally it went to MΩ.

All repairs have been completed, the TV has been assembled and put into service!
In the photo I highlighted the problematic resistor; there was no circuit diagram during the repair, so it seemed to ring on the third leg of the OB3350CP.

In general, nothing new, whoever doesn’t work is not mistaken)) Just a repair..., I think in this chassis it will be another type due to the quality of the resistors marked 01C.

Hello, today we will try to fix the Tricolor TV receiver with our own hands. Many people have encountered this problem when the warranty (usually 12 months) has expired and the receiver suddenly breaks down. A new one is expensive, and in most cases, repairs will not be difficult and will cost pennies, if you are even a little familiar 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 receiver from the Tricolor TV company GS-8300 N. I must say, the device is not the most best quality, and the money that Tricolor TV takes for it, of course, is not worth it. But, nevertheless, the number of subscribers is large and not everyone has everything working for a long time and properly.

Power supply fault:

The main and most common malfunction of all receivers is a malfunction in the power supply circuit and voltage conversion. 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 amount of pulling the power plug from the socket and turning the toggle switch on and off helps us (at least this 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 the warranty seal, which we will certainly break if we remove the cover. Therefore, make sure once again that the warranty period has definitely expired, and no one will repair it for you under warranty. If the warranty is still valid, I advise you to take the receiver to a service center and entrust this matter to a specialist.

Opening the lid, we see printed circuit boards with many components connected to each other by wire buses. Below are photos describing some of the devices on the board. First of all, we are interested in the power board; it is not difficult to distinguish it by the transformer installed on it and the power supply cable. And the first thing we pay attention to is the fuse. It is usually installed at the beginning of the chain. The fuse will not necessarily have the shape you are familiar with (a glass capsule with a thin conductor inside), for example, in my case the fuse is enclosed in a small plastic box, and in order to get directly to the fuse itself, the cover of this box must be removed. This is done very simply, for example with tweezers. Having reached the fuse, we check it with a tester or multimeter for a break. If the fuse burns out, which by the way happens very often, we go to a radio store, buy the same one, change it and that’s it. If this is not the case, we check the parts further along the chain. Often the transformer itself fails; we can detect such a malfunction by measuring the voltage on the secondary winding. I must say that not everyone can replace the transformer, if so, then it is better to take the receiver to a workshop, but if you are confident in your abilities, then go ahead, for example, it will not be difficult for me.

Receiver inside:

The electrolytic or oxide capacitor located at the input often dries out and fails, which is also a malfunction; not everyone can find such a breakdown either, you need to have at least First level radio amateur. Typically, faulty capacitors will have a yellowish appearance, or a small brown spot on the board at the base of the legs. Also, the health of a capacitor can be determined by comparing its nominal and measured capacity.

The receiver uses direct current, which is rectified from the AC network using a diode bridge. Problems with the diode bridge also happen. Diodes are very easy to check; 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 usually has a radiator for heat removal. I determined the malfunction of the transistor by measuring the voltage at its emitter, it was absent there, the primary winding was not powered, and therefore everything else was de-energized. The transistor cost me 28.5 rubles. Replacing it with a soldering iron, I fixed the fault and the receiver is in working order again. I must say that such a breakdown is quite a rare occurrence; usually everything ends on the fuse.

A very common problem is a firmware crash. The firmware often crashes, which is usually evidenced by the receiver completely freezing. In this case, “reflashing” will help. I would also like to say about another cause of malfunction, which may arise due to poor-quality installation. Water in the cable. If the external insulation of the cable is broken, then water from precipitation can get inside and easily enter the receiver like a hose, sometimes flooding all 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 accessibility of satellite television to the masses, there is now a wide range of satellite equipment available to the public. This satellite receivers, conditional access modules, antennas, converters, etc. Whether we like it or not, sooner or later breakdowns happen to them, which make us feel like we have lost a favorite thing.

There is no need to despair - for this purpose there are service centers that you can contact and they will help you bring your equipment back to life.

Equipment breakdowns occur due to various reasons- voltage drops, failure of various components, wear and tear of the equipment itself from its venerable age, you can also note the incompetence of the owners themselves, for example, incorrect replacement software in satellite and cable receivers.

A power supply failure is perhaps the most common type of malfunction of digital terminals. It occurs for various reasons: poor-quality power supply (see photo), low-quality radio components are used, especially this is de facto in Chinese technology.

This also includes improper operation, dust, dirt, and as a result, incorrect thermal conditions (see photo).

The service center is a structural unit within the 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 individual users, but also equipment dealers who strive to relieve their customers from the problems associated with the repair and maintenance of receivers. A flexible policy towards corporate customers allows us to provide adequate service and satisfy the interests of all customer groups. This is more than 1000 units of equipment per month. It is, of course, possible to carry out such large volumes due to the professionalism of the employees, the equipment of the service center with professional equipment, tools and technical documentation. Therefore, our service center carries out highly complex repairs: for example, replacing processors in BGA cases. Repairs take place in the shortest possible time.

The supply department, in addition to its main function - purchasing equipment, also deals with the needs of the service center, purchasing components necessary for repairs. And here it is worth noting that the selection and purchase of components for repairs occurs according to the following criterion: the quality of the 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 in in electronic format and is 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 absence of some scarce radio component. Sometimes repairs require complete replacement motherboard, and this repair part is not always available. In this case, we try to find some acceptable solution together with the client, taking into account his wishes, combined with our capabilities.

The receiver died after a power surge.

Upon opening, the following were found to be out of order:
- network capacity C5 - 47µFx400V
- Q1 - CS2N60F
- R8, R11, R13 - each with a nominal value of 3 Ohm (size 1206)
- R9 - 47 Ohm (1206)
- U1 - it was not possible to determine its type based on the markings on the case.

According to the table for identification and selection of analogues, the last part was replaced with SG6848 with minimal intervention in the factory circuit.
Dismantling: (circled in red in the photo)
- U1
- R8, R11, R13 - 3 Ohm (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 resistor 1.8 Om x 0.5W (regular output, because I didn’t have the required smd value))
- instead of C3 there is a 100 kOm resistor (1206)
- instead of R26 there is a 33 kOm resistor
- instead of R25, we select a resistor in the range of 10-12 kOm, controlling the 3V3 voltage at the VD8 cathode. I settled on a nominal value of 11 kOm, U=3.36V (at 10 kOm U=3.28V, at 12 kOm U=3.41V)

Instead of the burned out Q1, an SSS4N60B (TO-220F body) was installed

GS-8300 power supply diagram

Telesputnik posted a power supply diagram.

There are inaccuracies:
1. The bottom terminal of the primary winding must be connected
to the connection point between anode D6 and drain Q1
2. The position designation of C2 and C3 is incorrect. C3 should be connected to the 3rd pin
U1, C2 to 4th pin of U1.
3. Rating C3=68nF
4. There are two capacitors C1 in the diagram
5. No C12
6. Primary land is designated in the same way as secondary.
7. Missing C8
8. Q2 - MOSFET NTD14N03R
9. Rating C11=2200pF
10. Type D8=SR560
11. The position designation of U3 and U4 is incorrect - they need to be swapped.
12. Rating C5=47µF

If the AV output does not work

Question:

The receiver turns on, there is 18 volts on the LNB. There is no video signal, it gets very hot (can’t hold your finger) stv 6419..could there be no video because of it? Is there no other point? (I mean, there’s nowhere else to get a video signal from?) The receiver switches channels..

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

Solution:

the video signal from the STi5119ALC processor arrives, you can check it with an oscilloscope at the test 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 chip; on the 3rd leg of STV6419, the 12 volt zener diode D3 near the power connector is faulty

There was this answer: if you use only a composite video signal, most likely you can simply throw it away (replace it with a jumper). Where should I put the jumper? if this is the right advice...

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

Zener diode brand and parameters:

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

Zener diode analogue:

I couldn’t find a similar VD3 STV6419 zener diode (SMD). Put 0.5 watt glass zener diode the size of a diode kd522 . So far the flight is normal.

If replacing the zener diode does not help:

After the thunderstorm, 6419 swelled. After the replacement, the image did not appear, but when checking the wiring, two resistors turned out to be broken, R91, R95. Replaced it and everything worked.

One more problem:

And yet, instead of 13, 18 Volts, the LNB received 24V. Needed replacement DA1 (LM317T). And that's it, the flight is normal

The same situation for the GS-8304 receiver:

After 5 years of operation, the GS-8304 suddenly stopped broadcasting, although the display was working properly.
The zener diode has broken through to short circuit... Zener diode brand MMZE5242B...

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