Hello, I'm TV Tech1 and I'll be working with you to identify and help you resolve your problem.
It's kind of a challenge to get BOTH on the same input. And I think that's where you might be.
This is what I tell my customers.
First, most TV sets will receive Freeview using the Aerial connection.
Second...you need a FreeSat box, so why not use one of the Video connections for that, and just switch between TV input and FreeSat input.
That's the way it should be, and to be honest...I don't think your problem is a TUNING issue....it may be your Freesat is dead.
No channels at all on Freesat?
OR....are you attempting to scan both Freeview and Freesat channels into a FreeSat box?
If you're attempting to use External on your TV...you're telling me you have a Freesat on external, and get Freeview on the TV source.
Sorry, I'm not trying to confuse you, I'm assuming your TV and Freesat was working fine, and somehow you lost Freesat signals and you're trying to get them back.
This isn't a new setup situation, correct?