Convert Sony TDM-IP1 Digital Media Port iPod Dock to RCA

I am converting the Sony TDM-IP1 Digital Media Port iPod Dock to RCA. This post was a good start to find and understand the pinout.
https://www.diyaudio.com/community/threads/sony-dmp-to-line-in.183135/

I connected:
  • AGND(L) and LGND(R) together and to the RCA GND
  • L to Left channel
  • R to R channel
  • VBUS to 5V source
  • PGND to the GND source

In the above configuration iPod starts to charge, great news. But no music. I have to disconnect the power (5V) so the music starts to play.
So I have one or another. Not sure what I am doing wrong.
Any ideas?
 

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