Sound is lost when switching from SD to HD

[Deesai]

I have this issue where I lose sound when I switch channels from SD to HD. I have Vizio VL420M. The issue is fixed temporarily when, either, I reset the HD STB or turn off TV and STB when on a HD channel. When I re-start the STB and TV, the sound comes back. Its been a week since installation but issue is not going away. According to Verizon it is a known issue in my neigbourhood so they won't give me new STB or send a technician.

Do you think I have a faulty STB? Or I need to change some setting on the TV. I am connecting the STB to TV via HDMI cable.

[lasagna · Accepted solution]

Read this ... in particular, my instructions (written under the name "ravioli" during a time when I was temporarily unable to login to my account) on changing the audio settings on the STB.  This could be an HDMI handshake issue with it sensing the encoding technique it should be using for audio.

http://forums.verizon.com/t5/FiOS-TV-Technical-Assistance/No-sound-on-HD-Channels/m-p/212632#M20815

[Deesai]

Thanks a lot..It worked...I still can't believe that Verizon tech just brushed me aside as problem that could not be fixed. I was about to cancel the FIOS.

Thanks again.