Why does the sound crackle when I use the bluetooth connection?

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AC Question

I recently replaced the charging port on my samsung galaxy s4. It was a success even though I am not techy! I also replaced the back gray covering thing. I did not replace the speaker section. Now, when i try to listen to music with my bluetooth headphones, the sound is crackly; the sound goes in and out and is unlistenable. Using the headphone jack for music works fine. I have checked three different bluetooth enabled listening devices and the music produced by all three is crackly and in and out.
This was not an issue before I replaced the above parts. Obviously, I did something, but what and how do i fix it? Thanks for any insight!