Headphone jack distortion even after replacement

Hello, I've bought this secondhand iPhone 4S and since day one it had the distortion problem when plugging in the headphones, so I went on ebay and ordered a replacement flex cable. I replaced the cable, turned the phone on and it still has the same issue, speakers work perfectly but headphones don't, where could be the problem?

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Comments:

is there corrosion on volume fpc? inspect that area carefully

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the fpc is clean, don't see any visual damage

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