I know that to enter diagnostic mode with the Cisco/SA digital cable boxes to hold down Select and Exit. But once in those screens, what are the key metrics to look at and what should they be?
Once in a while I get a frozen picture, so I then have to press channel up or down, and then return to the previously frozen channel, which will then be working (happens on Sprout, where we spend most of our TV watching time
). But otherwise, TV is good 98% of the time.
In the diagnostic screens, QAM SNR on the two channels of the DVR hover in the 34-36 range, with no errors that I can see, even during/after a "freeze" event.
What I found interesting today is that I was moving furniture around, and I disconnected the cable line from the back of the SA Digital DVR box before unplugging power, and the Sprout show continued to play for 5-7 seconds after I unplugged it... and then it froze the picture on the screen just as it would do during a weird freezing event. Interesting..