i would say an inductor
and the Richtek Tech RT9284A-20GJ6E seems a good candidate, check the pinout vs the pcb and surrounding parts
for the chip i've seen smps controller in these packages
if the coil get hot it means you have some short on the supply line or a bigger current consumption
not being rude, but the pcb is messy / greasy etc ... did you try to unsolder things