SONY AVR audio delay

When I turn on my system the TV and Fios box are instantly on, the sound takes about 10 seconds but it is in snyc with the picture.  The delay, I've discovered is the TV switching from internal speakers to the external ones.  The TV and AVR are both set to use the external spkrs.  However when I turn the TV off it reverts to  the internal ones until it is turned on next.
I haven't found a work-around for this issue.

Now that I understand what's going on I can correct my error above.
I still have the delay but it's the SONY AVR that is creating it.  All the electronics are sync'ed via HDMI and SONY control. The difficulty is that it's the AVR power draw takes a bit before the AMP itself actually powers on. And then it automatically switches to the external speakers, a delay of 10-12 seconds.
Coincidentally my stereo tech was here today and rewired the two front towers via the crawl space, putting each tower in the corners of the room, and then re-calibrated.   Made a tremendous difference in the sound - what's the word- immersion.
He told me there is nothing to be done about the delay -the workaround is to turn the AVR on first.  Leaving it on forever is not an option SONY allows.

I'm glad you got that sorted out. I know how irritating sound delays can be.