Intermittent sound issue

Hi,
Hope someone can help with this issue I'm having. It seems to be an intermittent issue but has started to happen more often recently.
Originally around a few months ago I would turn on all my devices (TV, AV Receiver and YouView Box) and I would not get any sound (I do get picture). By just switching channels, the sound would then be heard. I presumed it was a problem with the HDMI connections and it didnt happen all the time so not such an issue.
More recently (in the last 4 weeks) switching channels no longer returns the sound. I need to switch the you view box off and then back on to get sound. Again not such a big issue as although it was happening more often it was a simple work around.
However in the last few days the problem has gotten worse. Now instead of the no sound occurring when I switch everything on, the sound is turning off when I change channels and also when I'm just watching a channel. Again the fix is to just switch the you view box off and back on but because its happening at least once when I switch on and then at least once when I'm watching tv I'm actually starting to get a bit annoyed.
Could this be my setup or equipment or a problem with the youview box?
My you view software is; manufacturer 18.3.0, component 2.5.6, platform 1017 and ISP 90.
The you view is connected to a Onkyo TX-SR390 and then onto a LG 50PK590. All done vie HDMI.
Thanks
Rob

Hi Jamie et al,
From the reports above, it appears there is an intermittent compatibility issue between the YouView Humax box and Onkyo A/V receivers. I'm not aware of any issues with other A/V receivers but it is not clear which of the devices is at fault.
There are two simple workarounds:
1. Set HDMI Audio Format to Stereo (no good if you want surround sound from HD channels and Video on Demand).
2. Use an S/PDIF optical cable as Onkyo advised.
Option 2 is the best option - you just need a suitable optical (TOSlink) cable - available from the BT Shop or many high street shops for a few pounds (or eBay).
On the YouView STB be sure to set S/PDIF Audio Format to Surround (in Settings - TV Signal & Quality).
On the Onkyo receiver you should find a digital input screen that lets you assign the appropriate optical input to be associate with a particular HDMI input. See page 46 of the Onkyo TX-NR525 manual to assign the Optical audio input to your YouView source - this should override the HDMI audio.
http://www.intl.onkyo.com/downloads/manuals/pdf/tx-nr525_manual_e.pdf
Note there is no loss of quality doing this with a YouView box - you will still get 5.1 Dolby Digital audio from programmes that have surround sound (e.g. some HD films, sport and drama on Freeview and Extra TV channels as well as Video on Demand).
(Note BluRay players can take advantage of the extra bandwidth available on HDMI to output Dolby True HD 7.1 etc which is not available over S/PDIF but I'm not aware of any Set Top Boxes that offer 7.1 audio).
I'll see if we can reproduce this and raise it as an issue if we can - thanks for providing the feedback from Onkyo.
Please let us know if this solves your problem or if you need any help.
BT TV Expert
I am a BT Employee and an expert on TV queries. I am here to give advice primarily on the BT Vision+ box. Go Here for more info.
If my post has been helpful, please click on the Ratings star on the left-hand side of the post.

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