30-pin Connector Adapter DIY Problem
I already own a standard MHL adapter cable with micro-USB plug and HDMI output, which works for various devices such as the Samsung Galaxy Note, S2, HTC Sensation, Flyer, etc. This is a good investment because the adapter is a standard one.
I don't want to buy another MHL adapter with proprietary 30-pin plug for my new Galaxy Tab. The 30-pin version MHL for tab is unreasonably much more expensive and I can't find a third party substitute at this moment.
Thus I am trying to make a connector adapter so that I can use my existing MHL adapter. Unfortunately, following the pinout diagram shown above, I was unable to make it work. I am sure that I connected the MHL_DP, MHL_DM correctly. The problem probably lies on the MHL_ID. I have tried connecting the MHL_ID to ground but it didn't work. I wonder if anyone can give me some hints? Should I add some resistors? Where can I find more information?
The attached picture shows my DIY design (not working at this moment)