Had a similar problem with my Apple TV and 40" Toshiba.
The normal sound on the TV is poor (no audio out port on it either). Solution ............
Purchased the LG HT321 ...................
Now Apple TV connected via HDMI and the Audio is channelled via the Optical Audio to the LG DVD player. Need to select Au Op as the sound source.
Sound from the TV to the surround system, this required audio to be channelled via a SCART cable. Again TV-Sound needs to be selected.
The DVD unit is also connected to the TV via the HDMI (should there be a DVD rented)!
What a setup 😉
No need for a HI-FI and boy the sound is great 🙂