My 990 has started to have issues with locking onto the surround format. When it has this problem, the two main speakers have no sound, but the others do. If I cycle through the formats, the problem is fixed and sounds the way it should.

Thoughts?
Suggestions?

I haven't run into that problem. Is it happening with all sources?

Yes, and I even tried new cables.

I have run into an issue with discs with both Dolby Digital and DTS. The 990 will absolutely not allow me to choose DTS decoding. I've checked and my DVD player has DTS switched on. Grrrrrrr....

Huh? No DTS? It shouldn't be a case of "choosing" DTS, since the 990 should automatically detect it and kick in the DTS decoding. There's the classic question - do you have the player's DTS output set to bitstream (which has finally started becoming standard) or PCM? - but I read your post to say that you've already checked that. The other classic question - have you picked DTS from the disc's menu? - I suspect you've also addressed.

I came across this problem a few times that 990 did not switch to the right decoding, after I had chosen the analog, stereo by-pass, on cd listening the night before. I hit DVD on the remote, 990 shows the right signal path to DVD with default digital decoding format (i.e. DTS), but no sound from any speaker at all. I had to either flip to other source (say vcr or CD)then flip back to DVD, then sounds came back.
It is not a real big problem, but would share with you all.

Kwok

I have a similar problem where the two main speakers occasionally get no sound. I've noticed this happening primarily when I switch from a DD source to a DTS source or vice versa. I fix the problem by switching to a new source and then back to the original source.

Seems like there are at least a few units that have this issue. Hopefully someone is looking at fixing this, and I hope it's a software issue.

I've never actually lost the sound altogether, but I have had it randomly change my system presets and/or attempt to play back 2-channel stereo sources in PLII mode.

Cheers,

Yea, mine does that by default. 2-channel is sent to PLII Movie by default based I guess on the settings that I chose in setup.

This issue is where not all the speakers get sound and you need to switch format to get the mains to come back online again.