The IC outlined in red is probably a voltage regulator. But exactly what type it is hard to determine from the photo.
First off, try and see if you can identify any numbers and markings on the case of that IC. Sometimes the conformal coating makes seeing the numbers somewhat difficult. So try looking at it under strong light from several different angles. Sometimes I find taking photos (with the flash off, and with the flash on) sometimes shows the markings and numbers on the IC. If you can get some photos, post them up.
If you can’t make out any identifying markings on the IC, the next approach to determining what the IC might be is to make some assumptions and some measurements. If it is a voltage regulator, the large tab (at the top of the photo) is likely to be the ground. Using a multimeter (and with the dash powered up) carefully measure the voltages on the other five pins - but be very careful not to short out any of the pins while doing the measurement. I can’t stress the last bit enough - one slip may cause irreparable damage elsewhere in the circuitry.
For example, the following diagram is the pinout of a PPAK voltage regulator (but it might not be the same as the one on your board). By doing the voltage measurements, you’ll be able to see if the voltage measurements align with the pinout from the data sheet I’ve randomly picked from the web.
The other very useful thing to measure is the voltage of the ‘Vout’ pin. I’d hazard to guess that it’ll be 5V but it might be 3.3V (or something else).
Also, just to put out some alternative suggestions… capacitors, especially electrolytic capacitors, are probably a more likely failure point. So if it’s a guessing game, maybe try replacing the two capacitors first? They are the ‘can’ shaped devices near (what we are guessing is) the regulator.
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