AppleTV 3rd - Update 5.2 (6025): No Audio through Airplay

Hi folks,

An acquainted of mine just updated his ATV to 5.2 (6025) and after that, no audio will play through Airplay.

ATV 3rd.

Samsung TV/ Display.

Performed troubleshooting:

1 - Restart/ Restore of ATV Software;

2 - Disabled Dolby Audio from ATV Settings;

3 - Put ATV to sleep, so it would be like a "SMC in a Mac"';

4 - Tried to research for downgrade links, which later on I discarded as a possibility (because I tested on a lab the Airplay with the same software 5.2 (6025) and it worked just fine. The only difference was the Display brand (LG in this case).

5 - At this point, the only thing I can think about is: HDMI is working for video (mirroring works properly with Macbook). I thought the HDMI might not be carrying audio signals.

Any clues or workarounds?

At the meantime I will suggest him a new HDMI cable.

Thanks.