What are QL2 and IP2? I'm guessing one is a transistor? Use the diode check and resistance functions of your multimeter to see if any two pins are shorted. A short would be 0-ohms in resistance mode, 0V in diode check mode.
Total guess, but if these are semiconductor parts getting hot, it's possible the parts themselves aren't bad. Shorted semiconductors often blow up, releasing their magic smoke, and then blow the fuse. If they get hot without blowing up and the fuse doesn't blow, there is usually some other component failure causing them to not fully switch on and off. The excess resistance of just partially switching makes them get hot. After enough time, they could go into thermal runaway and short/blow up/smoke. It's not unusual for bad caps to cause transistors to overheat/fry. Check to see if any of the electrolytics are leaky or swollen on top.
Total guess, but if these are semiconductor parts getting hot, it's possible the parts themselves aren't bad. Shorted semiconductors often blow up, releasing their magic smoke, and then blow the fuse. If they get hot without blowing up and the fuse doesn't blow, there is usually some other component failure causing them to not fully switch on and off. The excess resistance of just partially switching makes them get hot. After enough time, they could go into thermal runaway and short/blow up/smoke. It's not unusual for bad caps to cause transistors to overheat/fry. Check to see if any of the electrolytics are leaky or swollen on top.