I have TWC from Batavia NY and have had issues with sound drop outs and video pixelation on one of two TV's. The one with issues is connected via HDMI to an 8240HDC. The other is connected via component video to a 4240HDC. I had wanted to compare the two TV's signal qualities from the diagnostics menu (because some HD stations also go out on the 4240). I recently received a TWC firmware upgrade for both boxes. Unfortunately, when I got into each box's diagnostic mode (for both boxes: press and hold "select" until mail symbol flashes, then press Channel-), I found the signal level information was no longer displayed. Twenty three pages, but most was virtually insignificant info.
Does anyone know of another diagnostic sub-menu I might be able to access or has detailed signal info been removed from diagnostics?
Try holding the power button on the remote, once the power led on the front panel starts blinking release the button and press again to go to another diag screen. this is true on the DVR but unsure of the other model.