How to repair Yongnuo YN568EXII (TTL not working)

So. A typical issue with YN flashlights, where suddenly TTL does not work and flashlight only flashes using 100% power (even if the setting is set to lower power output).
Of course, TTL (ETTL) does not work, because flashlights (to use TTL) are sending a low power flash to measure how much light will bounce back to the unit (the bounced light measurement). As the unit is not able to send a low power flash, only a full-power one (1/1), it does not charge itself quickly enough to flash with the desired power [that is the simplest explanation why TTL stops working).
This Yongnuo YN568 EXII has served me well for several years and I don't regret buying it but had this feeling that it can be repaired.
I have opened the flashlight, found the part number, replaced it, which fixed the unit. Sadly due to the low quality of the part or my poor soldering skills, this worked only for a day. Attempting to repair it again ended up with me slightly damaging the PCB board. Ended up with the flashlight not working but at least I have tried
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[@lauryca03]

I've used it for 1500 photos until now and it's working fine. Thank you again! I can't believe that's it's working.

[@edmunek]

I am glad I was able to help 😊 around $40 saved 😊

[@jaym5938]

It's an IGBT problem, not a TTL problem. Thanks for the video

[@lauryca03]

I'll try tomorow. Thanks for the tip.

[@lauryca03]

It works. Thank you!

[@rogerclotsfotografia3939]

thanks mate i have the same problem, good to know its easy to solve

[@edmunek]

hope yours will work fine. in the end I just bought another two flashlights

[@treaddie1974]

Is there a particular place to obtain the semiconductor required

[@user-gr1rd8ds3p]

Can you put link for part in comments. Thanks

[@rolandlegaspi8878]

May flash full power but doesn't wor the flash of light

[@rogerclotsfotografia3939]

so, after i fixed, it happened same as you, after 1 shoot, burned again

[@edmunek]

😕 at this point (as you may know) I have given up

[@Marko-od7eb]

So what is the part number ?

[@edmunek]

if you would watch the video, you wouldn't ask this question 😅😅😂

[@Marko-od7eb]

​@@edmunek I did but there is so many RJP4301's. What is the IGBT model ? Is it TIG056BF or is it TO-220FN ?

[@edmunek]

@@Marko-od7eb I was ordering TO-220FN. but it did not matter as they used to work for 5 minutes, sometimes a day, once was working for a week and had to be replaced again....

[@Marko-od7eb]

@@edmunek Thank you for your answer.