If the speaker is working fine and the terminal contact pads seems okay but still there is no sounds output over it. You may then proceed to check certain components on the Samsung S5282 PCB board that where the speaker is being connected. This solution below shows the components and connection line paths of the speaker which is useful in troubleshooting or repair.
Samsung S5282 Ringer, Buzzer or Hands Free Not Working Problem Solution
Locate all the highlighted components on the solution above, this components is where the speaker is being connected. You may check all protection diode then replace if found damaged.
If all the components above seems all okay, trace each connection line paths then mend to reconnect it back if found opened or cut.