This a copy and paste of a PM I sent to one of the community managers, hope it helps
You posted here https://forums.roku.com/viewtopic.php?f ... 35#p628935
a while ago to PM if troubleshooting didn't help with lip-sync/audio that many people are having with the built in Roku TV.
TV Model: Sharp LC-65Q73+
Roku Tv: 7233X
Sony STR-DE975 via Optical
I been having this problem since the day I open the box which was around Christmas (purchased on Black Friday). Noticed it right away by having both the TV sound and Sony playing sound at the same time and a very noticeable echo happens. Currently I have the TV hooked to my Sony Receiver via SPDIF since it's an older receiver. I had a slightly newer but cheaper Pioneer initially feeding it sound but gave that to friend. Both lack HDMI BOTH
have the same issues. Using the TV built in Network apps the audio appears to ok Hulu, Netflix, Amazon etc except for maybe Youtube which is hit or miss but I blame that some of source material themselves. Things go awry when plugging a USB drive (used several) or any HDMI device. Doesn't matter what is it, have dozen of cords. Tried my PS4, 2 Android Boxes, and an old HD-DVD player all have the same problem. Audio is generally delayed by around 200ms for Dolby codecs with slight variations but as others have mentioned these TV have a huge problem processing anything encoded DTS related, especially when trying to pass-though some of the more advance codecs. Huge lag spikes often in seconds happen. I been having to use an android box to watch most movies but since the delay is variable it's not really a fix. I have tried everything possible from reboots, re-installs, menu options, all kinds of different set-up to try to rectify the problem on my end. I feel like I'm pretty technical since I repair computers for a living and this is driving me nuts. I had a smaller 4k TV before this that ran the Opera OS. One feature it had was lip-sych and audio delay options. Why can't this be implemented in Roku? It would be a temporary fix but it would be something and at least acknowledge the problem. Any help would be great as there's so many other people frustrated with this problem.