I've found a burned chip (due to DC power overload) inside the sound card Roland UA-25EX. This is a picture of the part:
Can someone give me a hint? I'm not an expert, I want only to find the spare part.
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That is probably a switching power supply chip. That is a guess because of the inductor right next to it that is connected to one of the pins. Something that handles power is also more likely to be blown out with obvious damage as this chip.
Unfortunately, "88TI" is likely to be a package code as apposed to a true part number. On physically small packages, there isn't room for the full part number. Instead, manufacturers put a short code there that is unique accross their product line. Sometimes these package codes are listed in the datasheet, but rarely is there a reverse reference that gives you the part number from the short code. If you can guess the part, then you might get lucky if the datasheet shows the short code and it happens to match your chip.
Basically, this board is now junk. Toss it and move on. If the power supply went, there is likely other damage somewhere else. A short somewhere else could have blown up the power supply chip, or the power supply chip passing the full input voltage to the rest of the parts could have caused all kinds of damage. There is a reasonable chance that just replacing the one obviously blown chip won't fix the card.
From the nearby inductor (L35), electrolytic capacitor (bottom center), possible power transistor (lower left), possible power resistor (R248), I'd guess this is a switching voltage regulator controller chip. Perhaps you put too high a voltage at its input and fried it?