I believe that is the case. I have recently fixed my iPhone 4 power button because it didn't work any longer. After doing that, I realise that my vibrator doesn't work therefore I ordered a new vibrator. Later I discover that the headphone jack doesn't work as well. I had to make a refund and then purchase the audio flex cable.
The headphone jack, the volume buttons and the vibrator is all connected with a flex cable. You would need to change that in order for the headphone jack and vibrator to work again. That's how I fixed my iPhone 4.
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