Unidentified SMD Component
This board is in pretty bad shape.  There are two obvious failures, and these tend to ripple downstream and cause other problems:



It looks to me that these are for power regulation.  The corroded part may be the same as the orange tantalum capacitor next to it.  If so, they could be input and output caps to a voltage regulator.  And the 6-pin (destoyed) IC could be that regulator.

I think it's time to replace it!