Hello, Can you post the make and model number please? It could be just lubrication or the fan blade could be touching some frost.
Samsung side by side RS 60 JJSM
Thank you for the model number. The tinkling noise would be coming from the fan inside the fridge. If you would remove the lower drawers, you can access the evaporator coil by removing the inside back wall. This would exposed the fan motor as well as the evaporator coil You would see if ice has accumulated and has reached the fan blade that would make the noise. If it is ice, just thaw it and observe again for a few days. If the problem comes back, replace the sensor in the fridge evaporator. If there is no ice near the blade of the fan motor, lubricate the fan motor bushings. This could be making the noise.