Yamaha Receivers Hdmi No Audio Blu-Ray Movie Won't Play Audio Through My Yamaha Receiver. Can You Help?

Blu-Ray movie won't play audio through my Yamaha receiver. Can you help? - yamaha receivers hdmi no audio

I have a Yamaha HTR-5230 (receiver) and LG Blu-ray. I use a fiber optic cable to connect the sound to my receiver. My receiver is too old to have HDMI or I use it. I go through my players' elementary. The other options are: PCM stereo, multi-channel PCM, DTS recoding. The receiver automatically detects the audio signal and accepts the Dolby Digital. Here's the secret: In the pre - First comes the sound from the speakers (for surround sound) is different from the TV speakers and it sounds great. When the movie starts to play, but the tone is lost somewhere and it comes with nothing. This problem is not always present, play all discs. Some Blu-ray without problems, but I just bought Terminator Salvation and I have no sound! Great Blu-ray drive, it looks good, but not so well through the TV speakers only. I am the Blu-ray firmware update, but can not understand why the extracts to replicate the sound and the film, please. Someone knows the problem? for any help