Cant get any AC3 sound out from U1

I cant get any sound from movie with AC3 files to get out from the U1. Actually my U1 is connect by HDMI and SPDIF directly on my TV, I have tried in the settings with Auto / PCM / HDMI / SPDIF, but nothing I dont have sound playing. Sound works OK with non AC3 files.
My receiver is in repair so for the moment I need to have the DD AC3 sound on my TV, but I cant get them.
My TV is a Sony Bravia from 2012.