Need help to identify burned smd component

[Alex_ulli]

In addition to the capacitor problem, replacing the STL56N3LLH5 burned mosfets will be a complicated undertaking if you don't have the right equipment (hot plate, hot air/IR desolder) as they have a large pad underneath them soldered to the PCB.
All the close-packed components further complicate the task, you will need to isolate the part you are replacing with Kapton tape to prevent other nearby components from flying off.
Anyway, at least, the device is turned on now!

I've noticed that too, but thank you for mentioning it. While I'm waiting for the MOSFETs to ship, I'm checking Facebook marketplace to buy a used soldering station with hot air. I've already ordered solder paste with a melting point of 138°C (do you think it's suitable for this job?) https://www.amazon.com/dp/B0BLSKZ6W1?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1.

It's been a while since I was into this stuff, and technology and soldering equipment have advanced a lot, so thank you again for all the advice, I really appreciate it!

[Alex_ulli]

So,

I desoldered the capacitor that was previously heating up and checked it with an ohmmeter—everything looked good. I reinstalled it and then desoldered those burnt MOSFETs (which wasn't easy, by the way).

After reassembling everything, it worked! However, I noticed that both circuits for the main motors are heating up slightly, the current might be too high by design. Not sure how long it’ll keep working, but we'll see. I have some spares ready for replacement if needed.

As for the power input circuit, I left a 20V MOSFET in place because it's working fine and isn't heating up, so I decided not to touch it for now.

Thank you for your help!