Thanks for clarifying things for me. I suspected the Sharps had some issues with the STB from the Uverse forums, but I wasn't sure if that was a valid blanket statment for all their makes, or if only certain users based on their particular setup.
1) In regards to your question, I have tried keeping the STB on while I turn the TV off. The results vary. If I turn the TV back on right away (within a few seconds), then all is well. If I turn the TV off (with STB still on) and walk away for say 1/2 hour or even a few days, then one of 2 things happens on the screen
a) The screen is blank and shows flashes between 480i and 1080i - like it's searching for a signal
b) The actual TV signal comes through for a split second, then an error message flashes on for another split second (too fast to read) then blank, repeat sequence...
2) I have tried plugging into all HDMI ports. I started with 4 and have moved through the ports up to 7, which it currently resides.
3) Yup. Aquos link is disabled along with some auto poweroff features
4) Firmware. This I haven't tried but will do so tonight or in the next day or so. I was hesitant to do the update as I could only find the firmware upgrade on the Sharp USA site and not Canadian site, but I don't think there's a difference or shouldn't void the warranty (I hope).
5) Component cables. I'm pretty sure this will be my solution until this issue is resolve (or if it will be resolved...). I didn't have my component cables handy over the weekend so I dug up some old RCA cables and connected both (short 2 to 3 ft run). The picture looked decent and I was able to turn both systems off and on without a hitch after leaving it overnight.
Someone in another forum mentioned keeping the HDMI plugged in and should solve the handshake problem simply by having the components plugged in. This didn't work for me as STB was not responsive and both component and HDMI input ended up having issues getting a picture on screen.
At this point, my only working solution is having the component cables plugged in. This makes sense, as during my troubleshooting phase, I unplugged the HDMI cable from the back of the STB and turned off both TV and box for a few days. I came back and turned the STB on using the remote with no issues whatsoever. However, I had major grief trying to get a picture after plugging the HDMI port back into the STB. It might have been my sequence while turning things on and plugged in? Anyways, the final fix was to reboot the STB again - not too practical.
I'll try the firmware update soon and see if that helps with the HDMI link. Thanks Dr Dave.
I'm all ears (as I'm sure many others are) if anyone hears of any new updates with this handshake issue.