Hi --I haven't posted on this topic for a while, but did have the same problem with the HDMI A/V adaptor that many others describe.
There are some very good replies worth reading. Best guess - not all HDMI is created equal, both in terms of the TV sets themselves & the HDMI cables. So a problem with standardization apparently.
Although I resisted it for quite a while, I finally broke down & bought and Apple TV unit for $99.00 It solved the problem and as noted in several of the previous posts, also does a lot of other cool things. So on balance, I'm happy with the purchase.
Hope that helps. The "HDMI wizards", with their upgrades, updates & different versions, certainly aren't!
Good luck, Greg LaGana
I have my iPad connected to the Apple 30-pin AV adapter where I plugged in my hdmi cable. I can see my iPad screen on my TV fine. The problem is that only Netflix takes up the whole TV screen. If I want to watch YouTube videos or Internet TV, the image does not expand as with Netflix.
My wife has an Acer tablet which, when plugged into the TV through an hdmi cable, does fill up the TV screen at any time.
I spoke to Apple Support and they told me that currently the Apple devices (iPad and iPhone) will not do what the other tablet does.
I will probably return the adapter to the Apple store.