My speaker on my iPod is not working

Hello, let me start off with some of the history of the iPod. When I bought it the screen was shattered so I replaced it, it worked 100% then. A few months later I accidently closed my car door on the iPod. I bought the broken parts ( they were the digitizer, back cover and power/ volume flex cable) and fixed it but the speaker was not responsive so I bought a new one but it still did not work. I'm not sure why but that's the only thing that's wrong. What do you guys suggest trying?

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