Issue with audio jack/audio driver

Vostro 5490, Issue with audio jack driver

After purchasing PC and had a factory installed audio driver and everything was OK, then I decided to run an updates, which included also drivers, and after installing Realtek High Definition Audio Driver (6.0.8984.1, A02), one audio channel went dead, while other and mic are still working OK. Checked with other headsets and loudspeakers - it is still the same issue with one channel - irrespectively of 3 or 4 part connector. Can anybody suggest a solution to the issue?
Thanks a million in advance
John

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