Any idea if it is edge lit or back lit?

When you connect your source file via USB, what programme do you use to view the video?

TVs normally can't send out 5.1 audio when the source is through HDMI.
Only when the source is the TV itself then it can send out 5.1 audio. Also, most of the time only DD not DTS.

If you have AVR and external device, you can connect the external device direct to the AVR, you don't need to connect to TV.

The Cnet article I linked earlier mentions that DTS never gets passed-through in their testing. They tested with HDMI input to the TV and optical out.

http://www.cnet.com/news/20-tvs-tested-whi...to-a-sound-bar/

If you're looking for a TV that can pass a true 5.1 signal, then based on our results you'd be smart to stick to Sony, Toshiba, and Vizio models. Regardless of cost, all of the televisions from these three manufacturers that we examined were able to pass-through Dolby Digital 5.1 signals via their optical output.

A few things stood our from our testing. One is that DTS signals were downconverted to stereo PCM by every TV. So even in the best case scenario, TVs will downconvert surround sound to stereo for movies that only include a DTS soundtrack.

That's the thing, TVs seem able to do DTS with the tuner, built-in apps & USB but not external HDMI.
So many years has passed and support for such basic things are still problematic and improvements seem very incremental.

This is why we need AVRs and separate boxes to get things done but the costs can add-up very quickly. 
I was previously very happy with my setup since I can get everything connected to my AVR and do what they are supposed to do. Now, I have to use the TV apps for 4K video and simple things like ARC and DTS don't work. We are not even talking about HD audio or Atmos/DTS X. Audio support has always been dodgy and it continues to be so, just to find a box that supports HD audio pass-through is a pain as there are only a few that are able to do this and they are all buggy with some major weaknesses.

AC Ryan is old already. Those Realtek/Sigma chip devices were good for playing video and audio passthrough but the software has aged and there is no more support. If you go for Android, like the newer Himedias they come with their set of issues as well and most importantly no Netflix HD. Those streaming boxes like Roku can't handle most local files and also don't do HD audio passthrough. There is no perfect solution within reasonable cost and power consumption (rules out HTPCs). Everything is a compromise and will probably continue to be so for the foreseeable future.

Just to add, just because your Himedias can passthrough HD audio you shouldn't consider it as normal. Most android boxes including the famed Minix X8 don't completely support DD TrueHD and DTS HDMA passthrough. The Himedias are the exception rather than the norm. And the Himedia's have very little global support coz most of the info available are in Chinese and it is also not complete. Check out Iboum.com and you will see what I mean. So many boxes and there are still so many shortcomings.

Btw what video format can the UE630X read? I tried BDISO 40+GB file it could not detect.

Aiyoo.. that's the sad part no wonder it could not detect some files. Thanks for your suggestion.

Which android box are you using now and how happy are you with it?

You r welcome.. Seems like only a decent HTPC can improve your current setup.. So you essentially answered your question.. 

Yeah.. Keeping up is a pain... That's why I've begun saving & refused to trade up to a 4K TV just yet... IMO, an ideal setup includes a lovely 70" 4K Smart TV + regular Android OS apps support or Android TV + access to regular android apps, a custom HTPC (hardware upgradeable), a decent NAS system & router to boot. The icing on the cake being Google's 1Gbps gigabit Internet + TV service..

At the moment I'm using 2.4.. Will try out 5.0, thanks for your suggestions.

* found the problem. I used an old 10/100 switch to add more ports and plugged in the ethernet cable from the tv to the switch, restricting it's bandwidth. Looks like that needs to be upgraded. I unplugged the cable and connected it direct to the router and voila no more stuttering.

I still can get 5.1 but not dts ma, mainly due to limitation of the optical cable.

Where to find eco 1 setting?

When I click tv setup there are 3 categories
1) picture
2) audio
3) general

But no control under these 3 settings. Could it be your options are different?

I already have an avr which support DTS MA and truehd, the limiting factor is the TV doesn't support those formats, and I haven't seen one that does. Best way to get those support now is add an Android box which does.

Very rarely do they bother about sound since TV speakers don't cut it anyway. I think the only way they'll all budge, is if it's made an international standard/requirement that all TVs (@ least Mid-range & above) be able to play and passthrough (HDMI) the latest codecs onto a supporting AVR/HT. That just might do it...