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

Hello
I am the owner of the T.amp tsa 4-1300 power amplifier
The problem is that the tip won't turn on. After unscrewing the housing and measuring the voltage to the switching power supply, I noticed that the red diode mounted next to the capacitors was flashing. I will add that the fuse is intact. You can not see any burnt elements, the capacitors are whole .. I did not dismantle any further, because maybe some of you know the subject and do not want to unscrew the entire amplifier. I need help what could have ended in this ending here.
Regards

Added after 6 [hours] 15 [minutes]:

Attached I will provide a link to a movie with an identical T.amp, where there is the same problem, to show what I mean exactly.
https://www.youtube.com/watch?v=-p8wrjf3Rd0

I pulled out the entire motherboard, the IRGP 4066D transistors literally fired

Do you have a diagram or service manual for it?
I have not seen on the internet.

Only Service Manual, I looked for the schematic everywhere and did not find it

Unfortunately, it is a User Manual, i.e. a user manual, not a service manual.
Maybe someone has. Because not having it on the table and not having a pattern means reading coffee grounds.

Exactly, I looked at the entire board carefully, only these transistors are damaged, the capacitors are complete, all paths are ok. The power amplifiers on each of the 4 channels are also functional. I can send photos of the whole album if I can

Added after 8 [minutes]:


In the evening I will send more detailed ones

Added after 30 [minutes]:

photos before removing the heatsink with IRGP transistors removed

Added after 4 [minutes]:

removed heat sink and transistors that are in the same row as the damaged IRGP are mounted on the same heat sink
[img-2]

Added after 10 [minutes]:

additionally, photos in the attachment

What made these transistors fire?

that is, as if some resistor refused to obey .. only by the eye you can not see any resistor that would be connected to them, only what is this MKKP82 capacitor

Added after 22 [minutes]:

I personally suspect a transormator .. there is only a problem because there is no serial number on this current one .. I see transistors for 600V

Due to damage. And where this damage has occurred, it would have to be checked. It is possible that the transistor itself was not fully functional, it is possible that for some reason it was overloaded, or ... overheated.

Added after 1 [minutes]:

Matek920605 wrote:

I personally suspect a transormator.

TRANSFORMER - like the captain of the ship; comes down last.

Transistor data

there is no integrated circuit in the area, just more transistors behind them, but this is shown in the picture. they are marked: GBJ3006SF, 2506SF, 2x APT60D060BG

Added after 2 [minutes]:

https://www.youtube.com/watch?v=Le80PIi-yMs
in this video the guy pretty much shows exactly what's inside.

just something like that

cool, I think my eyesight is poor Thanks for your help, I order parts and start replacing, I only have a question about these transistors, it's hard to find identical to the 739P designation. Can something else be used? E.G. 725p

I also looked at ALI .. there for 10 50 PLN, but I do not know whether to risk it

Added after 2 [hours] 51 [minutes]:

There are 2 types of these transistors? I found IRGP 4066D and IRGP 4066D-EPBF.

Hello,

I have this amplifier with an identical fault.

Replacing the IRGP4066D and IR2110S will not do anything, I already had very expensive fireworks after replacing them, the taste turned on fully, the condoms started charging and after 3 seconds the main converter was turned on with a bang IGBT (but the voltage was correct because the green LEDs on all channels lit up).

The problem is that there are a lot of SMD elements around the IGBTs and they are of unknown value, eg capacitors, LEDs labeled EF8, etc. Maybe one of these elements may also be damaged, but the selection without knowing the value is omitted.

In my free time, which will come one day, I am going to replace the SG3525, and again the IR2110S and take the waveforms off with an oscilloscope, maybe they will tell something.

This converter is not very difficult, it is a full bridge system, but without knowing the SMD value, it is a bit of a lottery.

Thomann is playing a fool with the schematic.

Regards

Hello,

When writing back quickly - it seems to me that the system works like this - you turn it on, the main capacitors are charged for 3 seconds and the converter is turned on via the triac.

The behavior was exactly like this:
- Power ON,
- The diode on the motherboard was on, the capacitors are charging,
- After 3 sec. start of the converter, lighting of green LEDs on the front,
- millisecond and IGBT crash.

I probably have a problem on the primary side in SMD components, maybe some blanking resistors, gate control diodes ... I measured everything and found a few problems, but as I wrote above - this applies to SMD diodes, e.g. with the EF8 marking ... Resistors are not a problem .

On the secondary side, I have everything OK, before the repair of the converter in channel 2, there were two shorted transistors in the positive and negative branches, they are replaced. All short circuits and problems have been removed, even for this purpose I soldered out a hit.

Regards

Hello, in my case, I measured everything again calmly, it turns out that 1 channel is completely burnt, all 10 power transistors are punctured. As for these EF8 diodes, with the ir2110s systems, one is also damaged, because there is a transition on both sides, and I noticed that next to this diode, the ir2110s system has a slight bulge .. the rest of these LEDs on the entire board or there is no transition A mostly shows values similar

Hello,

First remove the IR2110 chip and then measure, these systems are damaged, they get short circuits. EF8 diodes are also present in the gretz bridge for low voltage on the secondary side, there you can also measure.

I can't find this diode in any SMD decoder, unfortunately.

I do not have this amplifier in front of me now, but rather fast diodes will be for the IGBT.

There are not many elements in this converter, but cramped values ... here it is lame.

One could try to substitute some other converters for the test, but the parameters are unknown.

The same situation with the power amplifier - put symmetrical voltages on the secondary side (there are 4 of them in total) as it plays, the problem is that someone would have to measure these voltages from an efficient amplifier.

Added after 3 [minutes]:

It was not without reason that the German forum considered this amplifier a bomb, including no current limitations for the converter, opinions are divided - one guns, and others the converter breaks with a bang, most often right after the warranty.

It was measured after removing the IR2110S.
Today, after work, I start desoldering the transistors from the burnt channel and measure the rest of the things

the entire board has been checked for damaged diodes with the designation EF8 and transistors (because IR2100S, IRGP is known ) on the whole board, diodes marked EF8 - damaged 3 pieces (the rest showed only one way about 500 OHM. Power transistors marked: NJW0302GC - damaged pieces 10 (one whole channel, transistors punctured). On the line of damaged power transistors there were also 2 pieces of damaged transistors (mosfets) GP105N15M - damaged 2 pieces. I found another damaged "transistor", I had no pleasure, with the designation KB15038B, which was located next to the damaged power transistors. I have not checked the capacitors yet, only for damage that are visible without measurements
attached photos of the elements


Added after 5 [minutes]:

photos in better quality

in the attachment there is a measured diode marked EF8 with a tester