Computer stopped charging battery. Computer continued to work untill battery discharged.Power into unit is fine (19 Volt) POSITIVE SIDE only travels to item marked EC-51 first electronic chip on Mother Board and stops traveling at that point. Negative side travels to on/off switch and is complete. My question is what is that item (EC-51) a fuse or a diode or neither? What can I replace it with? Can I jump it out? If I connect Battery to Mother Board which is on workbench it powers up fine but won't power up on power supply. Power Supply is good.