DIY car amplifier repair

The main task of repairing any UMZCH is to localize the failed element, which entailed the inoperability of both the entire circuit and the failure of other stages. Since there are only 2 types of defects in electrical engineering:

1. The presence of contact where it should not be;
2. Lack of contact where it should be,

then the "super task" of the repair is to find the broken or broken element. And for this - to find the cascade where it is located. Further - "a matter of technology." As the doctors say: "The correct diagnosis is half of the treatment."

The list of equipment and tools required (or at least highly desirable) during the repair:

1. Screwdrivers, side cutters, pliers, scalpel (knife), tweezers, magnifying glass - that is, the minimum required set of conventional assembly tools.
2. Tester (multimeter).
3. Oscilloscope.
4. A set of incandescent lamps for various voltages - from 220 V to 12 V (2 pcs.).
5. Low frequency sinusoidal voltage generator (highly desirable).
6. Bipolar regulated power supply 15 ... 25 (35) V with output current limiting (highly desirable).
7. Capacitance and ESR meter of capacitors (highly desirable).
8. And, finally, the most important tool is the head on the shoulders (required!).

Consider this algorithm using the example of repairing a hypothetical transistor UMZCH with bipolar transistors in the output stages (Fig. 1), which is not too primitive, but also not very complicated. This scheme is the most common "classic of the genre". Functionally, it consists of the following blocks and nodes:

• bipolar power supply (not shown);
• input differential stage on transistors VT 2, VT 5 with a current mirror on transistors VT 1 and VT 4 in their collector loads and a stabilizer of their emitter current on VT 3;
• voltage amplifier for VT 6 and VT 8 in cascode connection, with a load in the form of a current generator for VT 7;
• unit of thermal stabilization of the quiescent current on the transistor VT 9;
• unit for protection of output transistors against overcurrent on transistors VT 10 and VT 11;
• a current amplifier based on complementary triplets of transistors connected according to the Darlington circuit in each arm (VT 12 VT 14 VT 16 and VT 13 VT 15 VT 17).

We turn on the amplifier. The lamp should blink (while the filter capacitors are charging) and go out (a weak glow of the filament is allowed). This means that K.Z. on the primary winding of the network transformer there is no obvious short circuit. in its secondary windings. With a tester in the alternating voltage mode, we measure the voltage on the primary winding of the transformer and on the lamp. Their sum must be equal to the network. We measure the voltages on the secondary windings. They should be proportional to what is actually measured on the primary winding (relative to the nominal). You can turn off the lamp, put the fuse in place and turn on the amplifier directly to the network. We repeat the voltage check on the primary and secondary windings. The ratio (proportion) between them should be the same as when measured with a lamp.

The lamp burns constantly at full incandescence, which means we have a short circuit. in the primary circuit: check the integrity of the insulation of the wires coming from the mains connector, power switch, fuse holder. We unsolder one of the reasons going to the primary winding of the transformer. The lamp went out - most likely the primary winding (or turn-to-turn circuit) is out of order.

The lamp burns constantly in incomplete incandescence - most likely, a defect in the secondary windings or in the circuits connected to them. We unsolder one wire from the secondary windings to the rectifier (m).Do not confuse, Kulibin! So that later it would not be excruciatingly painful from improper soldering back (mark, for example, with pieces of adhesive masking tape). The lamp went out - it means that everything is in order with the transformer. It is lit - again we sigh heavily and either look for a replacement for it, or rewind.

6. It was determined that the transformer is in order, and the defect is in the rectifiers or filter capacitors. We call the diodes (it is advisable to unsolder under one wire going to their terminals, or to solder it out, if it is an integral bridge) with a tester in ohmmeter mode at the minimum limit. Digital testers often lie in this mode, so it is advisable to use a dial gauge. Personally, I have been using the “squeaker” dial tone for a long time (Fig. 2, 3). Diodes (bridge) are broken or broken - we change. Integers - we call the filter capacitors. Before measuring, they must be discharged (.) Through a 2-watt resistor with a resistance of about 100 ohms. Otherwise, you could burn the tester. If the capacitor is intact, when closed, the arrow first deviates to the maximum, and then rather slowly (as the capacitor is charged) "creeps" to the left. We change the connection of the probes. The arrow first goes off scale to the right (there is a charge on the capacitor from the previous measurement) and then creeps to the left again. If there is a capacitance meter and ESR meter, then it is highly desirable to use one. We replace broken or broken capacitors.

A low frequency amplifier (ULF) is a device every music lover knows about its purpose. This component of the audio system improves the overall sound quality of the acoustics. But like any other electronic devices, AU can fail. For more information on how to repair amplifiers of car audio systems with your own hands, learn from this article.

Before repairing, installing and adjusting the ULF in your car, you need to understand the breakdown. It is simply impossible to consider all the faults that can be encountered in practice, since there are a lot of them. The main task of repairing a device for sound amplification is considered to be the restoration of a broken component, the breakdown of which led to the inoperability of the entire board.

In any electrical engineering, including amplifiers, there can be two types of faults:

• contact is present where it should not be;
• in the place where the contact should be, it is absent.

Automotive ULF microboard

Repair of car amplifiers first of all starts with ULF diagnostics:

Soldering iron on the amplifier chip

Do-it-yourself car amplifier repair is carried out in accordance with what problem was identified during its operation:

1. If the transistor in the car amplifier breaks down, then before directly replacing it, it is recommended to diagnose the safety element by power supply. You also need to make sure that the diodes on the buses are working. If everything is in order with these parts, the installed transistors must be replaced.
2. For more specialized repairs, you need an oscilloscope. Having installed the probes of the device on pins 9 and 10 of the generator board, you need to make sure that there are signals. If the signals are absent, then the driver changes, if they are, then the field-effect transistor elements are replaced.
3. Capacitors change much less often during the repair process - as practice shows, this does not happen often (the author of the video is the HamRadio Tag channel).

Now let's move on to the question - how to set up a car amplifier? There are several configuration options - for use with and without a sub.

How to properly configure the ULF without a subwoofer - first you need to set the following parameters:

• bass boost - 0 decibels;
• level - 0 (8V);
• the crossover must be set to FLAT.

After that, adjusting the settings of the audio system with an equalizer, the system is tuned to suit your preferences. The volume must be set to maximum and include some track.How to set up an amplifier in a car for use with a subwoofer is also not particularly difficult.

For correct configuration, it is advisable to use the following parameters:

• Bass Boost should also be set to 0 decibels;
• the level is set to 0;
• the front crossover is set to the НР position, and the FI PASS control element must be set in the range from 50 to 80 Hertz;
• for the rear crossover, it is set to LP, and the Low control must be set between 60 and 100 Hertz.

It is very important to observe these parameters, since they determine the quality of the adjustment and, accordingly, the sound of the audio system. In general, the setup procedure is similar, using the level control to provide a more harmonious sound. The sensitivity of the rear and front speakers should be matched to each other.

If you don’t understand anything about this, it’s better not to go there, because repairs will cost more after you burn or break it.

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In more detail, the recommendations and procedure for repairing the microcircuit are described in the video below (the author is the Soldering TV channel).

Sun 6 Jul 2014

It's no secret that to get high-quality sound and powerful bass in a car, you definitely need a power amplifier. Today, fortunately, on the market you can find car amplifiers for every taste, it all depends on your specific needs. An amplifier for 200-400 watts is enough to power the standard car acoustics, but among us there are true connoisseurs of sound pressure, audiophiles and music lovers who will not be surprised by a couple of hundred watts of sound power.

It is for such people that class D amplifiers were invented - digital audio amplifiers that have high efficiency, compact dimensions and many other advantages.

Unfortunately, a car amplifier sometimes breaks down, in some cases repairs are more expensive than the initial cost of the amplifier itself, so it is very desirable to consider or try to repair it yourself, because sometimes a blown fuse can be the cause of a breakdown. Having at hand a simple and cheap multimeter with a diode continuity mode, you can find most of the defects that are very often observed in many car amplifiers.

Any car amplifier consists of three main parts - a voltage converter, a power amplifier block and a filter block (crossover).

A voltage converter or inverter is the most vulnerable part in any amplifier - 90% of the problems are associated with this particular node. The converter essentially powers the entire amplifier including the filter bank.

Exclusively all voltage converters are made according to a standard push-pull circuit using a PWM controller, most often on a TL494. Then everything is standard - driver, power transistors, transformer, rectifier and filter unit. In some (cheap) amplifiers, inverter circuits of an unregulated type are implemented - in a word, there is no control of the output voltage, of course this is quite bad, but it is not at all a necessary process if the amplifier is not sensitive to the supply voltage and is a cheap model.

Converter transistors - they are the ones that fail most often. In cheap Chinese amplifiers, transistors are strangely marked, even if you cannot find similar transistors, you just need to know one thing - the keys can always be replaced with IRFZ40 / IRFZ44 / IRFZ46 / IRFZ48 or more powerful IRF3205, the choice of keys is actually quite large, I just listed the most available options. In general, N-channel high-power field-effect transistors are used exclusively in all inverters of automobile low-frequency transistors - up to the brutal IRF1404.

Initially, we check the board by eye - sometimes visible defects can be observed (burned out resistor, broken tracks on the back of the board, etc.)

Before replacing the transistors, you must first check the power fuse, the diode on the plus and minus buses (when the power is reversed, it also burns out), and only after you have made sure that everything is ok with these parts, we replace the keys.

For a more professional repair, an oscilloscope is indispensable. Initially, you need to check the presence of rectangular pulses on the 9th and 10th output of the generator microcircuit, if any, then the microcircuit is working. Then we check for the presence of the same pulses after the driver - on the gates of the field switches. If there are no pulses, then most likely the problem is in the driver, if they are, then without hesitation we replace the field-effect transistors.

It is extremely rare that there is a problem with the power amplifier, the converter burns out first, keeping the amplifiers. In the converter, other breakdowns are possible, although very rarely. There is a problem with the input and output capacitors or the diode rectifier, which rectifies the high frequency AC voltage from the transformer.

In connection with the increasing attempts of novice people to hand-to-hand to repair a suddenly silenced auto-amplifier - the present is offered for reading (recommended):

Repair actions. The points:

1. The coolest option is “Chef, this is Lelik, the truncated is gone” (c)
When the power is connected - a fuse (of any reasonable wattage) - lights up to thunderous applause. Next steps:

1.1 With an unknown pre-history of failure, it makes sense to look at the protective diode (usually of an elephant-like design) for the input power supply and, at the input capacitors of the power filter. If there are no clearly distinguishable problems in these circuits associated with the consequences of incorrect switching on of an external battery, and SUCCESSFUL - attempts to reverse the polarity - go to.

2. Very quickly we call the tester the power keys of the power supply unit (PSU). As a rule, we see a number of parallel cascades. If at least one of them died - we valiantly remove everything - one hell of a replacement, you need to put ALL radio elements from one batch. From a heap of burnt trash (or from a "stash") - select ONE (.) Set, (ie a pair), and solder it into the appropriate place (on different shoulders, essno). It will be absolutely NOT superfluous.

3. Then check the power amplifiers for fatal damage. You can - ring out the transistors of the output stages with the tester, you can - simply apply a voltage of the order of +/- 25 Volts from the external power supply unit directly to the output capacitors of the standard power supply unit.

3.1. If the situation with the power amplifier raises doubts (or a smoke screen for switching on from an external power supply) - bravely remove the transistors of the output stage (or output stages - ALL.) - and supply B + and REM to the device. We look at the output voltages of the built-in power supply unit. If they are sharply underestimated - such as +/- 10 Volts - there is a serious suspicion of a defective transformer. It is very useful to view the corresponding pictures with an oscillator and evaluate the frequency of generation of the power supply converter, if it is higher than 0.1 MHz - this is not entirely normal. We can already confidently talk about a not very good transformer that needs to be rewound.

4. Transformer - rewound, and - heroically soldered. We connect the power supply and check the presence of normal output voltages. It is not harmful to make sure that there is a voltage of +/- 15 (+/- 12) Volts to power the pre-amplification stages, which, as a rule, is formed from the main supply voltage by a pair of linear stabilizers.

5. We connect an external signal (sound generator, for example) and look with an oscilloscope to see if the signal passes through the stages of power amplifiers.As a rule, circuits based on complementary pairs work quite stably even WITHOUT output stages, which makes it possible to quickly find defective radioelements during repairs, dispensing with acoustic and smoke effects.

This technique in no way pretends to be exhaustive (for example - as a matter of course - I did not write about a visual check of the condition of printed conductors, radioelements and the quality of installation). This is just part of a typical set of standard repair procedures for most amplifiers today. If these actions are performed, and the result is unsatisfactory, then it is already possible to create a new topic with shouts of “HELP”, not forgetting to inform the interlocutors about all the actions performed with the device. Good luck!

Today they brought in such an interesting car amplifier for repair. According to the owner of the car, such an amplifier has been in the car since time immemorial. The amplifier is the most common - a four-channel transistor amplifier with a built-in voltage converter. Everything would seem to be fine, but here the emblem is LADA, was it really collected in Russia?

Later, the documentation for the AL-100.4 was found on the Internet.

Rated power, 4 Ohm 50 W x 4
Maximum power, 4 ohms 100 W x 4
Rated power in bridged connection, 4 Ohm 100 W x 2
Maximum power in bridged connection, 4 Ohm 200 W x 2
Recommended fuse rating 20 A x 2
Dimensions 290 x 57 x 243 mm
Signal to noise ratio> 80 dB

Indeed, quite a powerful and good amplifier, judging by the board. A huge transformer immediately catches the eye - it is he who powers the entire installation - 4 amplifiers with a power of 100 watts each. Muscles are powerful field keys (they are the ones that burned out in this amplifier, but more on that next time).

The power choke is wound on a ring from iron powder. Consists of 7 turns, wound immediately with 5 cores of 0.8mm wire. Powerful diode from power reversal.

The generator is built on the traditional TL494 microcircuit with additional drivers to amplify the microcircuit signal. It is interesting that 2 drivers are used here (4 pairs of low-power transistors). Further, there are already powerful field switches of the 50N06 series. This is a fairly powerful series of field-effect transistors, there are 4 of them in the circuit, two transistors per arm.

The power of the converter is more than 400 watts, this is by eye. The transformer itself is powerful enough, which has two secondary windings. The voltage is rectified using powerful (Schottky diodes (diode assemblies). Further smoothing capacitors of 2200 uF 35 Volts per arm. Each of the secondary windings feeds two amplifiers.

In appearance, the AL-100.4 amplifier honestly gives its 4x100 watts, since both the power of the amplifiers and the voltage converter allow this. Next, we will consider the cause of the malfunction and repair of such an amplifier and a few more interesting facts.

We continue the topic about the LADA AL 100.4 car amplifier. The converter with power amplifiers are mounted on one board. LPF summator and timbre block on a separate one. On the board we can see 4 completely identical power amplifiers. Each amplifier develops a maximum power of about 100 watts.

The output stages are built on powerful bipolar transistors NPN-2SD718 (8A, 120V, 80W) and PNP-2SB688 (8A, 120V, 80W). This is a fairly well-known complementary pair that has found wide application in high-quality transistor amplifiers. Each of the amplifiers has one output stage and is powered by +/- 30 Volts bipolar voltage, so 100 watts for each amplifier is not a problem.

The amplifiers can also be bridged, thus increasing the output power to 200 watts per channel. But in this case, the amplifier will operate in stereo. The reason for the malfunction of such an amplifier was in the voltage converter.

In general, in almost all automobile amplifiers of increased power (with the use of PN) such a problem occurs.Of course, the amplifier is protected by a fuse, there are two of them, but the device protected by a fuse burns out first, having protected the fuse - this is not a philosophical expression, but the pure truth. According to the owner, the amplifier failed after he accidentally reversed the polarity of the power connection. Strange as it may seem, neither the fuse, nor the built-in protection, and even the protective diode from overplacing saved the amplifier.

Power keys flew out at once, and there are as many as 4 of them in the circuit. Here are used quite powerful field drivers of the 50N06 series, in fact, they are almost complete analogues of the IRFZ44, so that you can replace it, but after checking the circuit in advance. It is quite simple to check the circuit for operability. It is necessary to connect the power supply and check the generation of rectangular pulses at the 9th and 10th pins of the microcircuit. If there is generation, then you can safely replace them. In my case, IRFZ44 transistors were used. The amplifier is working as good as new!

This completes the ULF repair. Keep in mind, before turning on any electronic device in the car (car radio or power amplifier), pay strict attention to the polarity of the connection, do not hope that the protections can be saved, practice shows that during real threats, none of them work , then you will have to pay a lot of money to repair expensive equipment.

The sound amplifier in the car is the main component for obtaining high-quality and clear reproduction of musical compositions. They are installed both separately from the car radio and inside it. Auto amplifiers, installed in a separate enclosure, have excellent power ratings and are capable of creating perfect sound. The main feature of this equipment is the power supply system, as well as operation in conditions of low humidity and significant vibration. Therefore, the repair of car sound amplifiers is a work to restore the performance of special electronic devices for highly specialized craftsmen. At the first even insignificant signs, it is recommended to immediately contact specialized workshops for the repair of this technique, because comfortable movement without a spacious and beautiful sound in the car is impossible.

Among the first signs of amplifier failure are the following:

• Decrease in the power of the reproduced sounds;
• Crackling, howling, or other extraneous sounds in the speaker system;
• Operation of only one channel of the amplifier.
• Even the faintest almost imperceptible smell of heated plastic or insulation from the amplifier case;

Many modern audio signal power amplifiers for cars are equipped with several types of protections, therefore, when one of them is triggered, which means that the sound signal to the acoustics stops or the corresponding signal indication (if it exists, of course, exists on the device panel), you must immediately turn it off. them from food. This can be done in several ways:

1. Removing the appropriate fuse in the block (for each brand of car, its installation is individual), thereby breaking the power supply circuit of the amplifier;
2. By disconnecting the power connector from the sound-amplifying electronic device itself.

This procedure will allow you to continue driving without music, but with a working power supply generator-battery connection, before the failed car amplifier is sent for repair.

Repair of car sound amplifiers depends directly on the type of this equipment and its class, and this applies to both troubleshooting, its elimination and, accordingly, the cost of such work. So, all car amplifiers are divided by the number of playback channels:

1. Single-channel, also called monoblocks. These devices are used to amplify one separate frequency range, most often low-frequency (bass).Many connoisseurs of music believe that without such a subwoofer it is impossible to enjoy musical reproduction, and in some ways they are right, since it is this special type of amplifiers and acoustics that is capable of creating incredible low-frequency vibrations (bass);
2. Multichannel. They can have up to six separate channels, creating a true stereo effect in the car or even the effect of being present at a concert of your favorite artist. Most often, car amplifiers still have two or four channels, and this is quite enough, and six-channel amplifiers are expensive, since they require the installation of a modern conversion side based on a sound processor.

Car audio amplifiers are also classified according to signal distortion and efficiency. There are four classes of amplifiers:

• A class. This technique is able to create ideal crystal clear sound, however, with a low efficiency, only about 20%. such losses are due to large losses in amplification stages and electrical circuits. This class of power amplifiers in cars is very rare, since it has low output signal power and high cost;
• To the class. Slightly more powerful than the previous one, but inferior in sound clarity and is also rarely used;
• C class. Differs in high performance and relatively good sound quality, its efficiency is about 75%, so the price-quality ratio made this equipment a leader in purchases and installation in cars.
• D class. This sound reinforcement technology is endowed with the ability to digitally process the sound signal. It has high power ratings, efficiency and clear, comfortable sound even for the most selective music connoisseur. It can scare off its future owner only by its cost.

The most common reasons that lead to malfunctions of audio amplifiers for cars are:

• mechanical damage to the case and as a result of electronic parts;
• power outages;
• overheating or malfunctioning of heat-dissipating devices, due to incorrect or incorrect placement of the amplifier;
• discrepancy between the ohmic resistance of the acoustics and the output stage of the amplifier;
• moisture penetration into the device.

In principle, high-quality and expensive car amplifiers most often serve their owner for a long time and do not require special maintenance or prevention, therefore, with proper installation and connection, they work without repair or damage.

Is your TV, radio, mobile phone or kettle broken? And you want to create a new topic about this in this forum?

First of all, think about this: imagine that your father / son / brother has an appendicitis pain and you know from the symptoms that it is just appendicitis, but there is no experience of cutting it out, as well as the tool. And you turn on your computer, access the Internet on a medical site with the question: "Help to cut out appendicitis." Do you understand the absurdity of the whole situation? Even if they answer you, it is worth considering factors such as the patient's diabetes, allergies to anesthesia and other medical nuances. I think no one does this in real life and will risk trusting the life of their loved ones with advice from the Internet.

The same is in the repair of radio equipment, although of course these are all the material benefits of modern civilization and in case of unsuccessful repairs, you can always buy a new LCD TV, cell phone, iPAD or computer. And for the repair of such equipment, at least it is necessary to have the appropriate measuring (oscilloscope, multimeter, generator, etc.) and soldering equipment (hairdryer, SMD-hot tweezers, etc.), a schematic diagram, not to mention the necessary knowledge and repair experience.

Let's consider the situation if you are a beginner / advanced radio amateur who solders all sorts of electronic gizmos and has some of the necessary tools.You create an appropriate thread on the repair forum with a short description of “patient symptoms”, ie. for example “Samsung LE40R81B TV does not turn on”. So what? Yes, there can be a lot of reasons for not switching on - from malfunctions in the power system, problems with the processor or flashing firmware in the EEPROM memory.
More advanced users can find the blackened element on the board and attach a photo to the post. However, keep in mind that you replace this radio element with the same one - it is not a fact that your equipment will work. As a rule, something caused the combustion of this element and it could “pull” a couple of other elements along with it, not to mention the fact that it is quite difficult for a non-professional to find a burned-out m / s. Plus, in modern equipment, SMD radio elements are almost universally used, soldering which with an ESPN-40 soldering iron or a Chinese 60-Watt soldering iron you risk overheating the board, peeling tracks, etc. The subsequent restoration of which will be very, very problematic.

The purpose of this post is not any PR of repair shops, but I want to convey to you that sometimes self-repair can be more expensive than taking it to a professional workshop. Although, of course, this is your money and what is better or more risky is up to you.

If you nevertheless decide that you are able to independently repair the radio equipment, then when creating a post, be sure to indicate the full name of the device, modification, year of manufacture, country of origin and other detailed information. If there is a diagram, then attach it to the post or give a link to the source. Write down how long the symptoms have been manifesting, whether there were surges in the supply voltage network, whether there was a repair before that, what was done, what was checked, voltage measurements, oscillograms, etc. From a photo of a motherboard, as a rule, there is little sense, from a photo of a motherboard taken on a mobile phone there is no sense at all. Telepaths live in other forums.
Before creating a post, be sure to use the search on the forum and on the Internet. Read the relevant topics in the subsections, perhaps your problem is typical and has already been discussed. Be sure to read the article Repair strategy

The format of your post should be as follows:

Topics with the title “Help fix the Sony TV” with the content “broken” and a couple of blurred photos of the unscrewed back cover, taken with the 7th iPhone, at night, with a resolution of 8000x6000 pixels are immediately deleted. The more information about the breakdown you put in a post, the more chances you will get a competent answer. Understand that the forum is a system of gratuitous mutual assistance in solving problems and if you are dismissive of writing your post and do not follow the above tips, then the answers to it will be appropriate, if anyone wants to answer at all. Also note that no one should answer instantly or within a day, say, no need to write after 2 hours “That no one can help”, etc. In this case, the topic will be deleted immediately.
You should make every effort to find a breakdown on your own before you get stuck and decide to go to the forum. If you outline the whole process of finding a breakdown in your topic, then the chance of getting help from a highly qualified specialist will be very great.

If you decide to take your broken equipment to the nearest workshop, but do not know where, then perhaps our online cartographic service will help you: workshops on the map (on the left, press all buttons except “Workshops”). You can leave and view user reviews for workshops.

For repairmen and workshops: you can add your services to the map. Find your object on the map from the satellite and click on it with the left mouse button. In the field “Object type:” do not forget to change to “Equipment repair”. Adding is absolutely free! All objects are checked and moderated.A discussion of the service is here.

DIY car amplifier repair

You are a condom. capacitor. and not a condenser. what a bitch do you say in a fagot?

Excuse me, but you are the "condom", Sergei. On what basis are you insulting a person for such a trifle? If you do not like it, do not listen to or watch this video. What is the problem? Vyebony is absolutely useless here. Learn to talk normally with people, without insults. Perhaps he will pull for constructive criticism. To whom it is convenient, he pronounces it. The main thing is that this moment does not change the essence of the video, not a drop. Just blowing a camel out of shit out of the blue, by God.

output transistors are ancient like mammoth shit. analogue of our KT819GM-KT818GM.

Precisely noticed, only - KT825 - KT827

Well done. Try further and you will succeed. Put my thumbs up

How to detach transistors from the case? they stuck to me. Is there any way to rip them off?

Heat the case itself with a soldering iron. Transistor. Do not fry too much, or you will overheat.

the transistors on the tip36c output stage burn out. burns out one. change it. the other is on, it plays quietly, you turn up the volume a little and burns out again. monoblock, transistors are connected in parallel 4pcs tip36c and on the other side 4pcs tip35c. what is the problem ? one of the four tip36c constantly burns out, you change it, the VCL turns on, but it is necessary to connect the sub and turn up the volume a little again, some one burns out. with another amplifier, the sub works fine

Video (click to play).

Dmitry Barsukov check the resistances, there are large transistors next to them.

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