Using a piece of wire or a pin or a small paper clip, you can test each pin. You are trying to touch each pin to its surrounding solder connection.

Be careful not to bridge any pins to each other.

Pause on each pin and see if the sound starts playing when you probe each one.

You may need to probe more than one pin at the same time. Look for pins that have a visibly poor solder joint.

Identify one or more badly soldered pins.

Turn off your machine before proceeding.