I always do this.
Yep, I learned that a long time ago when I use to have to send mainframe stuff to IBM for repair. Then I learned how to repair it all myself, and saved the company scads and scads of money.
I always do this.
Glad to hear that you identified a solution!
Personally, I don't like the "by source" setting as a resolution handshake occurs between the STB and the TV each time the channel is changed. This slows down the channel changes and extends the black screen time as the TV changes the input resolution.
Originally I had somewhat low expectations with a name brand like, "Linkbox". :-/ But as far as I can tell, it's made in Korea and I'm all for trying anything not made in China! If the receiver had a cooler name like SatTracker, or Star Scan or even North Star, it might sell better.
It depends very much on the FEC ratio of the particular broadcast you are watching. I've seen perfect c-band reception on 99W on a 1 meter dish, when QUALITY showed as 0 (zero)! Even without a pll lnb.