I've not seen or heard of such.

 

I have, but they're active boxes (take power) and the last I saw of one of these on Amazon, it was going for in excess of $200.

And that was for 3-wire component RCA (analog-signal HD) - not single-cable composite SD TV.

EDIT - just found this - much cheaper than before -

http://www.amazon.com/HDMI-Composite-S-Video-Converter-3RCA/dp/B0047PDBP0

You'll still need to get an MHL->HDMI adapter.

And don't trust the HDMI->component cables.

 

Give these a shot.

~ $40
HDMI -> RCA (Component)
For only $34.93 each when QTY 50+ purchased - HDMI to Component (YPbPr) & R/L Stereo Audio Converter | HDMI to Component (YPbPr) / VGA Converters

~ $10
Micro USB to HDMI MHL Adapter - Black
For only $8.82 each when QTY 50+ purchased - Micro USB to HDMI MHL Adapter - Black | MHL Adapters

Honestly though, wouldn't it just be better to watch your video on the 720p GNex?

 

After the Micro USB to HDMI of course

5-foot HDMI to VGA/ 3 RCA Cable | Overstock.com

I have NO IDEA at all if it will work but the price sure is right compared to the alternatives.

 

It can't work. HDMI/MHL is a digital signal. RCA (composite video) is analog. It is impossible for a cable to convert that signal. Just putting the right plugs on both ends of the wire doesn't mean the signal will pass.

You need an active box, like EarlyMon posted, because something actually has to be actively converting the signal from digital to analog.

 

Solved.... not a fake cable. use app from play store Mira-wire follow setup instructions. Make sure u use pin adaptor