Dust does not cause a crackling sound in DVD players. You either have a bad connection between the player and the amplifier/receiver, a bad preamp out circuit board in the DVD player, or a bad input circuit board in the amplifier/receiver. You can figure out which one is the culprit if you have another amplifier/receiver system to test with. If the problem moves with the amplifier/receiver, then it's the DVD player. If it does not, then it's the amplifier/receiver.
Answers & Comments
Dust does not cause a crackling sound in DVD players. You either have a bad connection between the player and the amplifier/receiver, a bad preamp out circuit board in the DVD player, or a bad input circuit board in the amplifier/receiver.
You can figure out which one is the culprit if you have another amplifier/receiver system to test with. If the problem moves with the amplifier/receiver, then it's the DVD player. If it does not, then it's the amplifier/receiver.