Whitey I am running my LC-45 without the box currently. The AVC box fritzed (again) about two weeks ago.
Here's how I got around it.
HTPC and PS3 through Monoprice HDMI switcher, HDMI in and out. Out using HDMI adapter to DVI connection on Sharp proprietary cable to LC-45 (I can verify that Monoprice HDMI x DVI cable works as well).
HTPC environment is Vista Media Center.
Dish Network feed to VMC through Hava Titanium Wifi HD on LAN.
VMC Netflix on demand.
VMC Hulu using TunerFree MCE (nice free program but I donated due to benefit).
Five standalone TV sites outside of VMC; TV Shack, etc.
I channel audio through an old Onkyo 7.1 component receiver.
It's OK. Not perfect by a long shot. The VMC remote handles all the HTPC functions and is close to seamless with Dish.
One upside to all this is I have gotten warm and fuzzy with VMC. No longer a sideshow in my setup, regardless of my future setup it will be front and center.
Among the cons are:
Everything on Dish is downconverted by Hava and then upconverted by the Nvidia card built into the HTPC MB. PQ suffers on live tv. Acceptable, but that's the best I can give it. Otherwise PQ is great. Recorded TV like Hulu, BD on PS3, stored video from my home server, games from home server all display a great picture although I can't stretch SD in some programs.
I may yet get a tuner card and retire the Hava, but I am expecting delivery of the AVC DC/DC card today and I will try to get the AVC back online first.
Since the monitor is 1080 native it requires an upconversion or passthrough at that resolution. Some PS3 games do not play since the PS3 does not upconvert digital game signals and many titles are 720 or 480.
I do not know about OTA or cable but with Dish I had to move the signal into the HTPC to get a picture, hence the Hava.
As noted, audio is only available through a separate scheme. The onboard speakers are doorstops without the AVC. I suppose one could run cabling or if you have the Sharp cable there should be an adapter but it's not on my radar.
The AVC offered switching between inputs, adjustment of PQ as well as a litany of incidental tweaks. That's all gone.
So, considering todays prices on LCD TV's around this size in the 1k price range and lower, spending a lot on workarounds is kind of tilting at windmills. I had the Hava and PC already so my fix was not a commitment of big money.
The LC-45 is a great supersized monitor, and with a 100$ tuner card or a Hava or Slingbox and some fiddling it can be part of a fair system coupled to a PC.
Sales pitch follows. If you aren't in the market for an AVC for this monitor don't bother reading...
I have a spare AVC from my last goround with this problem. It is insured, no longer works, and I intend to return it and recoup the 300 smackers that I paid for it. However I am willing to part with it for that price to whoever can use it since I imagine that SquareDeal will just junk it which is kind of a pity. It does not work as it sits, but I will in the next day or two have it and the new DC/DC card in the same place.
I'm willing to pop the cover and plug the card into it to see if it cures the snafu. If I get both AVC's to fire up the monitor with the new card in place that would pretty well indicate that a new DC/DC card ($150) added to the 300$ AVC would give a monitor owner the whole package, that is if you have the proprietary cable that ties the two together.
As I say, I'll have the new card today if UPS tracking is not a lie and will know something in a day or two. I'll post the results.