Tesla 13.7 body sculpt repair problem, need help with finding the thyristor marking.

[loko]

Hello everyone.
I have a device that is used to shape the human body muscels and burns fat. Works on the principle of electromagnetic impulses. One thyristor in side is shorted which has only this unknown mark on it ( QC230301 ). I can't find any information about it anywhere on the Internet. I tried to replace that thyristor with one of 1.6kv 800A and after 5min. of work he has burned out again, which means that he is probably weak. There is no schematic diagram on the internet, but that didn't suprise me because all the transistors and chips that are on the boards have their markings polished to protect against copying or unauthorized servicing... The device has two compartments that are separated from each other. It works so that the control panel sends a certain voltage to big caps. That voltage I cannot measure because as soon as it turns on it detects an error. This large capacitors store energy that is controlled by two thyristors at the output electrodes. The capacitors also have no marking except for the date of manufacture. Those thyristors are not very cheap, so I don't really feel like trying them without knowing exactly which one would be ok.
Any help is welcome.

[eccerr0r]

I do not want such device touching me even if it promises me that I'll be able to dead lift 1000 pounds in a day... WTF. Keep. It. Away. From. Me.

What are you actually seeing? The SCR is overheating or just shorting out? I'd probably think that the drive circuit that controls the gate is at fault if it's dying without overheating.

[loko]

Jep! One bad looking machine!
This SCR that i install was not overheated just get's shorted after 5 min. of work.

That thyristor of mine that I installed lasted only 5 minutes of operation and after that it is short-circuited. The device is about 2 years old, the warranty has just expired, but even under the warranty, one thyristor that is on the left in the picture has already been replaced, but it does not have any markings either. that one is still ok. Both the left and right sides are controlled from one board, and on it I compared the two outputs that go to the gate of the thyristor and all the measurements are identical. My current problem is that according to the marking of the original thyristor that is in the picture, I cannot find any information about how strong it is, and there are many of the same ones that look identical physically, only with different strengths...

[eccerr0r]

Size of the device mainly relates to maximum current passed as the device needs to dissipate more than a watt per ampere passed - you probably are not getting a "stronger" SCR that fits in the same space, maybe only higher voltage -- voltage rating is not as significant to size. Is it connected directly to mains and controlling mains voltage? Then it would be just need to survive mains voltage? Without additional information I can only think your gate drive is likely killing it (or perhaps kickback if the controlled item is inductive? But that's what the giant diodes are for?) or the ones that broke were fakes...

What is it powering? giant transformer? Superconducting electromagnet?

Are you sure there's nothing else printed on the SCR?