I had the D7 apart tonight to see what IC chips I could find. Note the elusive RTL 2832 looks like this: The little chip to the right of the antenna connection that looks to have 8 pins per side. While the case was apart on my D7, I could not identify one of the chips. It had 10 pins on each side, so it's not an RTL2832U. It was marked Silead GSL1680. With a websearch for Silead, I identified it as the D7's touchscreen driver chip. Better luck next time. I would have taken a picture of the innards of the D7, but Mrs Gunbunny has the camera tonight. There really isn't much to see in there, most of the board is shielded, and I'm not taking that apart. It seems I'm going to have to contact DigiLand and ask them what they have in the tablet.