I have an LG 42PC5D television. The Seven Network recently revamped their channels and introduced "7mate" to their offerings.
The issue I was experiencing was that while the picture was perfect, there was no audio.
After some basic troubleshooting with the unit in question as well as the other televisions in the house that showed a picture and produced audio for 7mate, I started to wonder if something was wrong with the LG.
It turns out that the Seven Network and LG were aware of the problem.
The fix is to perform a firmware upgrade on the television via a USB thumbdrive. The LG Frequently Asked Questions page will provide some helpful information.
The upgrade process itself is quite simple.
In Summary:
Create a folder on the USB thumbdrive called LG_DTV
Download the correct firmware for your television from the page above
Turn the TV off
Plug the USB thumbdrive into the SVC port on the TV (mine was on the left near the A/V 2 connections)
Turn the TV on and wait for the upgrade screen to appear
Using the remote control, select START
When the firmware has been successfully upgraded, the TV will reboot itself, problem solved.
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