Dell :: Inspiron 15205 Sound From Intergrated Sound Chip

I have a Dell Inspiron 1520 with 8600GT. I wanted to buy a 5.1 speaker set but it would be of no use as 1520 does not have 3 audio jacks while the 1525 and XPS 1530 has 5.1 output.

I was just wondering, if it was possible to somehow get an extra audio jack outside the laptop by checking if a header pin for a third audio jack exists on the motherboard since the audio chip is HD audio and motherboard design would be similar to 1525 and XPS 1530

I lot of people have openend up their systems and taken a look at the audio circuitry to fix the static noise coming from the headphone jacks. Did anyone notice if a third audio jack could be soldered to the motherboard to get 5.1 audio.