I need some expert help...we've owned a 55LM7600 since August...no issues. Today the sound suddenly stopped working...just out of no where. We are just using the normal TV speakers, don't have a sound bar or anything else hooked up. Sound doesn't work on any of the components - Directv, Xbox, Blu-Ray. Talk about frustrating...2 days before christmas & 3 kids home from school! We need sound on our TV. Called LG...they are sending a tech out but not until the 27th. Is there anything we could do before then? To be honest the LG lady wasn't very helpful and didn't seem to know what she was talking about.