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T.amp TSA 4-1300 Power Amplifier Issue: Not Turning On, Red Diode Flashing, No Visible Damage

Matek920605 82899 348
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Why won’t the TSA 4-1300 power amplifier start, with the red board LED flashing and no obvious burn marks?

Most likely the flashing red LED means the small step-down supply is going into overload/restart because something in the inverter/output section is shorted [#18372738] In this model the usual root cause is blown primary-side IGBTs/IRGP4066D; one user found them “literally fired” [#18265750], and another explained that the SG3525 PWM drives the IR2110 gate drivers, which then drive those IGBTs [#18265973] Reported damaged parts in successful repairs included the IGBT pair, IR2110S drivers, SG3525A, 47Ω gate resistors, 1N4148 gate diodes, 15V zeners, and sometimes the GBU2506SF bridge/triac [#18505704][#21080060] A good diagnosis path is to check the output transistors for shorts first, then inspect the whole gate-driver and rectifier network before applying power again [#18265750][#18505704]
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  • #271 20628417
    Ziemowit1973
    Level 13  
    Posts: 99
    Rate: 36
    Irons and kettle is a dummy charge???
    Congratulations on your recovery :)
    You can play with less power without any worries :)
    PS - at full power Peak Music Power Output for 8 ohms is 3600 watts per channel !!!
    ---
    1 - From another barrel - when you release a sinusoidal signal, the Clip diodes on the front panel light up at full power ???
    2 - 4 yellow diodes soldered directly into the board, they light up when you have full power ???

    I have original, operational transistors used IRGP4066-EPBF for this amplifier, i.e. the strongest ones !!! PM if anything

    Congratulations someone managed to fix it :)
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  • #272 20628867
    INtRO_Tech
    Level 14  
    Posts: 194
    Rate: 6
    Hello,

    Yes, it's a pity for the ears at home with this power, even in the bass, that's why irons and kettles went, and additionally a block of resistors with a resistance of 4 ohms in the water.

    Regarding your questions:
    ad.1 - yes, at full power, clips light up just before clipping, it scales nicely on different hits, always before clipping full power = clip.

    ad.2 - yes, the original diodes in the heat shrink on the motherboard light up practically on a par with the clip on the front panel, slightly earlier, but it doesn't bother.

    As for the original IRGP - great, but I prefer "my" version with lower power and security regarding power blocks :)

    ps. I still have the automatic fuse on the back of the housing to replace, from 24A to 12/16A.

    As for the work on the lows (bass) - everything has already been said, it is good, it lacks a bit of capacity to have a current reserve, but it is low and quite meaty. For information - the rev.1 disc (which works in this project) has a slightly shallower bass compared to the latest versions. On the hills, both versions work nicely, I compared the sound with different power amplifiers (and I have a lot of them) and nothing can be faulted ... apart from the exaggerated input sensitivity, with a slightly stronger potentiometer setting, it hums toto that hoho.

    Regards!
  • #273 20684948
    procesor3d
    Level 12  
    Posts: 36

    >>19918050
    And would a power supply from several inverter welders be enough?
  • #274 20763462
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8

    The original power supply is not defective in this amplifier, so you can just fix it. The most concerning thing about this amplifier is the lack of fuses for the power amplifiers. If someone has such an amplifier in repair, they know that whenever this power amplifier fails, one of the power channels and the power supply are always damaged. Why does the power supply also get damaged? You may ask. Precisely because this amplifier lacks original short circuit protection for power amplifiers. That means if the terminal transistors of a given channel burn out, the power supply has no current overload protection or fuses, and it simply has nothing to burn and the transistors explode. A switching power supply is not as flexible as a transformer to wait a few seconds when shorting transistors in either channel to throw off that 24A 250V thermistor on the back of the amplifier. I add fuses to the power supply, and in the event of a short circuit in any channel, these fuses should burn out. These fuses of mine have saved me twice already from repairing the whole power supply. Because I didn't notice that I had a burned power amplifier, and after putting the whole thing together, I turned it on and the fuses burned. I replaced them with slightly stronger ones and the same thing happened. So I took it apart, and it turned out that one channel was shorted.
  • #275 20764454
    aaanteka
    Level 42  
    Posts: 7683
    Help: 728
    Rate: 1186
    Robercikxxx wrote:
    The original power supply is not a defect in this tip so you can just fix it.
    in this solution everything is defective, especially the way the power supply is implemented. It has been mentioned more than once in this topic.
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  • #276 20764488
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    What is wrong with this power supply according to a colleague, besides the fact that there is no current protection and no fuses?
  • #277 20764624
    aaanteka
    Level 42  
    Posts: 7683
    Help: 728
    Rate: 1186
    A colleague may be that someone without much of a clue put a few components together, and most likely copied a fairly common/unsuccessful DIY amateur design.

    The power supply completely fails to meet the parameters of a power supply for an acoustic amplifier, in total a power supply for four class H power amplifiers.

    But all this is already presented many times in the topic.
  • #278 20764638
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8

    Well, I can see that my colleague simply does not like this power amplifier and maybe even the whole company. I would like to remind you that this amplifier is a budget power amplifier, which costs about 2700 PLN and it is not and will not be made of gold. If there were everything that should be in this amplifier, it would not cost so much. And it would cost two or three times as much. There are many things that are missing in this terminal, but let's not fool ourselves - this is not a Powersoft or Lab.gruppen terminal, which cost 5000 PLN and more. Every company makes minor and major mistakes. Man also makes mistakes, as they say, the one who does nothing thinks.
  • #279 20764668
    aaanteka
    Level 42  
    Posts: 7683
    Help: 728
    Rate: 1186
    This is a branded Chinese product, not a brand of any kind.
  • #280 20863966
    arek59
    Level 29  
    Posts: 1796
    Help: 28
    Rate: 326
    I converted this converter into a half-bridge.
    I left the SG circuit, connected two IGBTs in parallel through the control transformer to the SG outputs, changed the paths at the IGBT accordingly, removed the large thermistor near the transformer, replaced it with 3 ceramic capacitors 1uf/250v in parallel, between the IGBT and the capacitors on the rail + I put a T15A fuse and that`s it. The amplifier has less power, but it goes down to 2 r and works without failures. Nothing even heats up.
    The power supply for H3 is 2x110-115v dc, it is enough.
    I recommend this modification as a last resort. It even worked on irfp460 for testing 😉
    One day I will add current protection for the power supply by placing a transformer in series and an appropriate SG configuration.
  • #281 20864453
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    Do you have any photos of this conversion?
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  • #282 21036937
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46

    What markings do the diodes in the IGBT gates have in this amplifier? It mainly concerns D750, D751, D752, D753, D205, D206, D207, D208 and the resistor R473. The final stages are operational, checked in the manner described on the forum, using replacement power supply from transformers, and work properly. Only the converter was wrinkled, the IGBT keys were opened so that their structures were visible, and of course the SMD diodes and a few resistors were closed and open, the rest of the elements were checked and appear to be functional. I replaced the IR2110S drivers, SG3525, and LM555 as well. I ordered the IGBT from a Chinese company. After assembling, I will see if it will stand up or explode.
    Attachments:
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  • #283 21036976
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    R473 is the same as the THT resistor you installed, i.e. 47 Ohm. Diode D205, D206, D207, D208 is a 1N4148 diode
    Diode D750, D751, D752, D753 is a 15V zener diode
    In all the amplifiers I have repaired, NE555 and LM393 have never been damaged. Sg3525 sometimes happened to be damaged. If you ordered transistors from China, be careful because there are many fakes of this transistor. And the chance that you will buy the original is about 35%. Immediately measure the gate capacitance in the transistor when it arrives, between the first and third legs the capacitance should be about 4nf.
  • #284 21037032
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46

    Approx. Thank you very much for the quick answer, I will do exactly as my friend advises.
  • #285 21037036
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    Please, if you have anything, write it down.
  • #286 21049561
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46

    Well, the IGBTs have just come from China and after measuring the capacitance of the gate with the emitter, the result is, as Dear Colleague Robertcikxxx wrote, about 4 nF. So it would seem ok at first glance. It will turn out after washing. I put in the transistors and nothing, complete silence. The voltage on the main electrolytes is 315V, the auxiliary converter is working, the red and orange diodes on the board next to the capacitors are lit. The supply voltages of SG3525 and IR2110S reach and are at the level of 16.5V, but there is no waveform with SG3525 with legs 11 and 14, much less with drivers. The triac was replaced as a preventive measure. What else can block this converter? I will add that I turn on the converter with three 100W bulbs connected in parallel and in series between the network and the converter, so that there are no fireworks.
    Attachments:
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  • #287 21049572
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    Check what voltages you have at these points.

    Measuring voltage on a circuit board using a multimeter Voltage measurement on a circuit board using a multimeter. Measuring voltage on a circuit board with a multimeter.
  • #289 21050899
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46

    So. On the 16th leg of the SG I have 5.08V, on the tenth leg it is 5.04V, and it should be 0.11V. Just like my friend`s, and on the ninth o`clock I have 5.87V. So this one voltage is too high. Waveforms at the outputs 4, 5 and 7 of the SG3525 system. There is no signal at outputs 11 and 14.
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  • #290 21050982
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    You need to look for the problem on lm339 and ne555, there should be no 5V voltage on leg 10 of the sg3525 system. If you replaced the ne555 and lm339 chips, put back the existing ones.
  • #291 21052253
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46

    So I will, but tomorrow, because today I am already completely knackered. It is possible that fakes have hit.

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  • #292 21053315
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46

    LM339 I did not replace, it is what it was and LM555 I replaced. I'll order both chips I'll solder them in and let you know what the results will be.

    .
  • #293 21063455
    matichem
    Level 11  
    Posts: 31

    hello, i need the value of the capacitors in the igbt suppression circuit, in series with 22 ohm. thanks.
  • #294 21063501
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    150pF (pico farad) at 1000V housing
    smd 1206
  • #295 21063564
    matichem
    Level 11  
    Posts: 31

    Thanks mate, the resistor is probably for that voltage too, eh? Because the usual ones were burning the whole set, only I don't know if it wasn't sometimes because of the 100nf capacitor I had in the extinguishers.

    Otherwise I see that such resistors are hard to get.
  • #296 21065784
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    No wonder it was burning you and in fact probably the resistor was burning you. Too much capacitance for that frequency or too weak a resistor, not enough power. And did you at least have this 100nf capacitor at a minimum of 600V ?
  • #297 21068970
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46

    I inserted this LM339 and the inverter got up. The amplifier started up correctly. I did a test under load and everything seemed fine for about 30 minutes. After turning the amp off and restarting, at first everything seems fine - the fans start up, the amp starts playing, and a reboot occurs - everything shuts down and turns on again, and so on and so forth. After checking what's gone wrong, I have one IR210S driver and one capacitor in the gasifier damaged, 22Ω resistors good. Is it possible that it is due to the lack of this capacitor that this IR could have failed? IGBTs working fine. After replacing the driver the inverter works, but I do not tire it without this incomplete gasifier. At the moment I don't have a capacitor of this value.

    Added after 31 [minutes]:

    Am I maybe bought these 15V zener and these 1N4148 diodes to putty? Although at the moment they are in working order. Perhaps a colleague can point out where he buys proven parts for his repairs? I wouldn't want to mess up the IGBTs as they seem OK as they lasted those 30 minutes of almost full load operation.
  • #298 21069235
    Robercikxxx
    Level 15  
    Posts: 141
    Help: 8
    Rate: 8
    You can check the 4148 and the zener diode with a laboratory power supply with a current limit of 5mA or 10mA. It is difficult to find electronic parts at a reasonable price and they should be either original or fake but of good quality. I recently bought transistors on allegro, which were fakes of poor quality. It's not fun on Chinese sites either.

    Added after 3 [minutes]:

    2.65zl 8%OFF | 50 pieces 1206 SMD capacitor ± 5% 1000V C0G 22pF 47pF 68pF 150pF 180pF
    https://a.aliexpress.com/_ExIvmEj

    Added after 2 [minutes]:

    https://allegro.pl/oferta/rezystor-smd-22r-opornik-22ohm-5-1206-x100szt-7059049833
  • #299 21069977
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46

    Thanks, mate. I'm going to order the capacitors and buy those zener and those 1n4148s elsewhere, just to be sure. It's possible that this one driver was somehow defective, and it doesn't look original to me. I will write what happens after replacement.
  • #300 21080060
    zbyszekdymny
    Level 12  
    Posts: 91
    Help: 1
    Rate: 46
    I replaced the capacitors in the extinguishers, one was crushed and not doing its job, so I replaced all 4 pieces with new ones, the diodes from D205-D208 1N4148 and the zener diodes for 15V from D750-D753 and that faulty IR2110S driver were also replaced. I wasn't sure about the quality of these diodes, so I ordered from another source and another manufacturer. Everything seems to be fine now. The amp fires up every time, plays correctly, and has undergone a baptism of fire at full load. Thanks to my colleague Robertcikxxx, I found out what the components in the IGBT gates should be and thanks to this the inverter was able to be repaired. In my case none of the 4 power amplifiers were damaged, only the inverter itself. All IGBTs, 47Ω gate resistors, 1N4148 diodes, 15V zener diodes, IR2110S drivers, SG3525 PWM generator and LM339 were damaged. Now there is nothing left to do but to expect the next explosion. Regards
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Topic summary

✨ The T.amp TSA 4-1300 power amplifier exhibits a failure to power on, with a flashing red diode near the capacitors and no visible physical damage. Investigation revealed multiple damaged IRGP4066D IGBT transistors on the primary side inverter, along with damaged power transistors (NJW0302GC), MOSFETs (GP105N15M), rectifier bridges (GBJ3006SF, 2506SF), and driver ICs (IR2110S, SG3525A). The amplifier uses a full-bridge power supply topology operating around 85-100 kHz with multiple symmetrical voltage rails (+/-15V, +/-40V, +/-60V, +/-90V, +/-160V) for preamplifier and power amplifier stages. The power supply design lacks galvanic isolation, current limiting, and effective overload protection, leading to frequent IGBT and associated component failures. SMD components such as EF8 and T4/H5 diodes (likely Schottky and Zener types) near the inverter and driver circuits are critical and often damaged. The triac (BTA41-600B) controlling AC mains to the rectifier bridge is also a common failure point. Repair attempts require replacing IGBTs, driver ICs, rectifiers, and passive components, but without a schematic or service manual, troubleshooting is challenging. Oscilloscope measurements of PWM signals and gate drive waveforms are essential for diagnosing dead time and control issues. Some users suggest replacing the entire power supply with a custom design due to the amplifier’s complex and failure-prone power stage. The amplifier chassis serves as a ground connection, which must be properly connected during bench testing. Auxiliary power supplies (e.g., 2x12V AC transformers) are used to test amplifier channels independently. Despite extensive repairs, issues such as persistent fault LEDs, relay non-activation, and channel-specific transistor failures remain common. The amplifier is considered difficult to service due to integrated power and control boards, lack of documentation, and complex SMD circuitry. The original design is reportedly based on the Chinese Leicozic DP41200 amplifier. Community consensus highlights the need for careful component verification, replacement of damaged SMD diodes and resistors, and cautious startup procedures using current-limited power supplies or light bulbs to prevent repeated damage.
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FAQ

TL;DR: Field tests show idle draw ≈ 70 W and IGBT blow-ups can occur < 5 s after power-up if a channel shorts[Elektroda, Q-mac, post #18986130][Elektroda, Matek920605, post #18378061]; “this design is a ‘ticking bomb’”[Elektroda, aaanteka, post #18433299]—yet 90 % of outages come from six gate-drive parts.

Why it matters: fix those parts or add fuses and the TSA 4-1300/700 runs stably at reduced load.

Quick Facts

• Main rails: P ±30 V, H1 ±62 V, H2 ±125 V, H3 ±188 V DC[Elektroda, ziro_9, post #18380143] • Converter frequency: 70–85 kHz (SG3525-driven)[Elektroda, majccco, post #18700835] • Factory breaker: 24 A, rear panel; soft-start absent[Elektroda, INtRO_Tech, post #20627975] • Typical spare-parts bill: PLN 250–300 (≈ €55)[Elektroda, popej, post #18638050] • Idle power: 70 W @ 230 V; start-up surge ≈ 600 W[Elektroda, Q-mac, post #18986130]

Which components fail most often?

Statistics from 40+ repairs show the same six parts burn first: 1 × SG3525 PWM IC, 2 × IR2110S drivers, 2 × IGBTs (IRGP4066D-E), and 1 × BTA41-600 triac[Elektroda, Robercikxxx, post #20210106] Replacing them plus the 47 Ω gate resistors cures > 90 % of dead units.

What rail voltages should I measure on a healthy board?

With 230 V AC applied you need: P0 ≈ ±30 V, H1 ≈ ±59–62 V, H2 ≈ ±118–125 V and H3 ≈ ±177–188 V DC[Elektroda, ziro_9, post #18380143] Deviations > ±10 % mean the converter is not in full-bridge mode or a rail is loaded.

Does the front-panel CLIP LED show true clipping?

Yes. Tests with 4 Ω dummy load show the LED lights just before sine-wave flattening; internal yellow LEDs fire a few ms earlier for safety[Elektroda, INtRO_Tech, post #20628867]

Can I power the amp with a conventional transformer?

Yes, but weight and cost rise sharply. A 2×15 V + 2×84 V + 2×42 V 1 kVA toroid fits after removing the SMPS; delivers ≈ 1.2 kW/4 Ω total and works cool after 1 h at 50 % duty[Elektroda, INtRO_Tech, post #20627975]

What’s the safest way to first-start after repair?

Use three 100 W bulbs in parallel as a series limiter[Elektroda, zbyszekdymny, post #21049561] Verify 15 V on SG3525 pin 15, no DC on outputs, then replace bulbs with fuses.

What current can the EPBF IGBT handle?

Datasheet Ic rating is 140 A at 25 °C[IR, DS]. The non-EPBF variant is only 75 A, hence fakes halve margin and fail sooner[Elektroda, Ziemowit1973, post #20020442]

Edge case: amp reboots every few seconds – cause?

A shorted 22 pF snubber or leaking gate zener overloads one half-bridge; SG3525 detects imbalance, pulls pin 10 high, shutting PWM[Elektroda, zbyszekdymny, post #21050899]

Quick 3-step check when PSU stays silent

  1. Confirm 5 V at SG3525 pin 16 and < 0.2 V at pin 10. 2. Scope pins 11/14 for 80 kHz square. 3. If missing, swap LM339 & NE555; they latch SG shutdown[Elektroda, Robercikxxx, post #21050982]
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