I bought one of these a few weeks ago.
It worked on one of my old receivers but not on my much newer TV and DVD.
I phoned the helpline in the manual and the number is no longer in use or is a bogus number.
As Lidl tends to have discontinued/overstocks, I suspect it the remote an old unit, and I am guessing that the unit does not recognise codes for various manufacturers new products. I also tried the learn function, but it would only work with some individual codes.
I am going to take it back for a refund
John, April 2009