Thinkpad T440 : Speakers not working only headphones

Hi,
I am facing a problem with a Thinkpad T440, there is no sound! it is looking like the speakers are not working, but when i plug in the headphones the sound come through the headphones.
I upgraded the drivers, tried to reinstall the OS but unfortunately nothing helps.
Thus, i disassembled the laptop and tried to figure out where the problem is? i find out that the speakers are working! I tried other speakers and the same thing happening > no sound
I tried to plug/unplug the headphones jack connector many times but without success
the headphone jack is apparently good at first sight!
Did anyone face the same issue that i am having?
Thanks in advance for help
Solved!
Go to Solution.

Thank you for your reply, I appreciate your help I tried this but it didn't help me
But I fixed my problem, I was increasing/decreasing the volume from the tool bar it wasn't working! I but I could see the waves when I put some music playing and no sound nothing was coming.
So I tried to deactivate the volume from F1. After that I increased the volume from the toolbar and hopefully it was working! so i figure out that the F1 and the sound card wasn't really syncing.
Thank you for your time and help

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