Below is an amazon review. i'm going to try this when i get home.. IF i can do it with my comcast box.
Found this review on Amazon:
They state the same issues with a possible fix:
I have had one problem that keeps me from giving it a 5 star rating, although it may have nothing to do with the set per se. I have had several instances of audio being out of synch with video, sometimes as bad as a dubbed Japanese Kung Fu movie. At times when changing channels we lost audio completely. It has happened when using an HDMI input, but never when using a component input. I have used 3 different HDMI cables (5 yrs old, new but cheap, new as supplied by Verizon on my bedroom HD Sony) and all had the problem. I chatted with helpful reps at AquosAdvantage (register there and get a 3 month warranty extension) who worked with me at length to turn off video processing functions to see if problem cleared. Then I worked to turn on functions (like motion control, auto contrast, etc.) one at a time. I went 5 days with no problem, then had 3 episodes yesterday, generally as a news network was coming out of a local commercial to the national news feed. Never had this problem with the same STB and my older Toshiba 720p set (which I hated.) No resolution yet. Easy to clear but annoying.
UPDATE: Nothing seemed to clear this audio problem so I called the AquosAdvantage support line. The rep (Brian?) was very knowledgeable and said they had seen this before. It is an issue with the HDMI setup on our Verizon STB. The audio needs to be set to LPCM. I called Verizon and spent three futile hours with tech help who had no idea how to access the hidden setup menu in our Motorola QIP7232 (supplied by them!) I Googled the problem and found you just need to press three keys in sequence - power (on the STB), Select/OK, then Menu (both on the remote.) The setup screen popped up, I changed audio to LPCM, and now everything seems to work fine. 60 seconds to fix, after hours on the phone. I changed my review from 4 stars to 5 since there was never anything wrong with the set. Other HDTV brands, and other cable providers, have this same issue.