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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.
You must have used a charger that has too much voltage and current delivery. You overloaded the power supply circuits and what you heard blowing up was a capacitor. This is a repairable problem. You must open up the dvd player and see how much damage was done. You can try to replace a few parts that will appear damaged and get a correct voltage adaptor and see if it works. Most likely though you have damaged the player beyond repair. Sorry to give you the bad news. If it is that damaged you should just buy a new dvd player. The cost of the repair and findign the parts will be a lot more expensive than buying a new player. I hope this information help you with your problem.
Borrow or get a cheap volt meter to see if the power supply is working. Insert one probe on the inside, and one on the outside to see what is going on inside the power supply/charger. Does the power supply hum or get warm? If not, it was probably made pre-broken at the factory in china. Either that or it's power lead has a break, it's power output jack or where it connects to the main board on your portable DVD player. -Pro Hack
The protect message indicates that a problem was deteceted inside the machine. normally this means that the output amp has a problem. Please post the model number of the receiver or amplifier and I'll post additional details. Also, this problem is currently listed under DVD players. I believe that this should be under receivers. If you can, please move this discussion to the correct category.