Well, I think you have the same problem I had. I can almost bet you it was one of your capacitors that you replace by the audio chip. I am not the best at soldering, so I probably shouldn't have done the "repair" myself. Since near the Audio IC was the hardest to replace (4 capacitors in a tight space), i managed to burn at solder pad. It had lifted off of the board enough, but I didn't notice it. It took me a few weeks to notice, because every time the audio UNMUTED, I would get a pop that I swear I did not hear before.
I looked into the audio IC and how it uses capacitors to prevent popping on mute/unmute. Using a multimeter, i found out it was one of those capacitors (don't remember which one, I know it was one of the two that are right next to the Audio IC pins.
So I removed one of it's legs, and it really only went a short distance to an audio IC pin. So I just moved the leg, soldered on the leg to the Audio IC Pin leg, and BINGO, no more popping.
If you didn't have the audio pops before the replacement, but have them now, I would put my money on that being the problem. Check those 4 capacitors near the Audio IC, test each pad (put one end on the solder pad for the capacitor and the other on where the trace on the board goes to from that pad, which is usually an Audio IC pin). Maybe your problem isn't as bad as mine. Maybe you just have a bad solder job on one of the capacitors rather than a burned off solder pad.
Good Luck! Happy Thanksgiving in advance!