New issue with DTVPAL / TR-40 they lose audio on some stations. I've had these up and running for years without this issue.
Sometime in late 2012, I lost just the audio on one station only. All of the other stations had audio.
Tinkering with it in Setup/Audio Setup, I changed the Audio Language setting to Alternative and selected Done.
The audio immediately returned. This particular station does not have any sub-channels.
I then changed the audio setting back to the default Primary setting.
Sometime later the same thing happened with the same station.
Sometime later the same thing happened with a different station.
This station has sub-channels and the sub-channels had audio while the main channel did not.
Again, all of the other stations in town had audio.
Using the procedure above that cured the problem before, did not cure the problem on this station.
The only thing that fixed the problem was setting the box to factory defaults and doing the installation procedure.
My neighbor had the same issue with is converter box, so the issue was not isolated to my unit.
What I started doing is not leaving the unit tuned to either of these stations when it is shut off and the issue hasn't occurred since.
The affected stations are the Milwaukee stations 6 and 58.
My firmware is what I believe is the latest available, F105 and the unit is a TR-40.
Disclaimer: I don't endorse any particular brand. Purchasing electronics is a compromise.
Brand selection may not be a main consideration.