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LG 55LM660T - 2D Performance and Input Lag

John Archer

By John Archer



  • Recommended by TR
LG 55LM660T


Our Score:


3D crosstalk

As noted in our recent review of the the passive 3D Finlux 42F7010 TV, suggestions that passive 3D is automatically immune to crosstalk’s double ghosting problem are just plain wrong. However, the LG 55LM660T really does keep crosstalk levels very low indeed - so long, at least, as you make sure you a) turn off all of the TV’s noise reduction processing, and b) don’t watch from a vertical viewing angle of more than 13 degrees. For both of these scenarios result in crosstalk rising from almost non-existent to excessive.

Take these simple precautions, though, and the bottom line is that 3D on the 55LM660T looks immersive, colourful, crisp, and bright - and as such is something you’ll likely be drawn back to watching again and again.

2D picture quality

Of course, though, even the most ardent of 3D fans will only end up watching 3D for a relatively small amount of their total viewing time. So, it’s great to discover that the LG 55LM660T is also a fine 2D performer.

Contrast is pretty extreme, for instance, as deep black levels manage to share the same frame as rich colours and punchy whites. What’s more, unlike last year’s 55in LG models, this mostly impressive contrast performance is achieved without the image suffering too heavily from backlight inconsistencies. There are small slivers of extra brightness down the extreme edges of the screen, but these can be controlled pretty well via some careful calibration of the set’s backlight and contrast settings.

LG 55LM660T

HD 2D pictures, meanwhile, look exceptionally sharp and detailed too for much of the time, while colours combine high vibrancy levels with the sort of tonal subtlety that shows right away that the picture processing engine in the 55LM660T is a pretty superior effort.

That such punchy, rich and satisfying pictures are coming from an edge LED TV with such a tiny bezel merely underscores the sheer drama and enjoyment of the 55LM660T 2D experience.

The 55LM660T is not a perfect picture performer, though. For starters, once the screen has been calibrated to deliver the best black level response and least backlight inconsistency, dark parts of the picture look slightly hollow, as the screen struggles to cling on to all the low-light detailing and dark colour information that helps dark scenes look as deep as bright ones.

It’s noticeable during both HD and especially standard definition viewing, too, that moving objects judder a touch and therefore lose a little resolution as they pass across the screen. Camera pans are also affected. But while this is something we’ll be hoping LG’s higher-level new TVs will fix, it’s no worse on the 55LM660T than we would expect of any mid-range TV.

Input lag

There is one area, though, where the LG 55LM660T does perform worse than most rivals: input lag. We’ve found the past few generations of LG TVs to suffer unusually long delays between source images arriving to the TVs’ inputs and then appearing on screen. And the 55LM660T continues this theme, taking in the region of 100ms to show pictures - even if you use the provided ‘game’ preset. This compares poorly with the 30-40ms experienced with most TVs, and has the potential to reduce the performance of console or PC gamers.

LG 55LM660T

Wrapping up our analysis of the 55LM660T’s performance with its audio, we find a solid enough effort - maybe a slightly better than solid effort by the standards of other ultra-thin TVs. The set struggles to sound open and detailed when the going gets tough, instead sounding rather thin and overloaded. But things seldom actually sound harsh, and there’s slightly more bass information around than might have been expected given how little room the onboard speakers have to work with.


The LG 55LM660T represents a great and ambitious start to LG’s 2012 TV range. As well as being stunningly attractive, and delivering features galore and some great interface innovations, it takes passive 3D to the next level while simultaneously delivering one of the best 2D pictures we’ve yet seen - from not just an LG TV, but any mid-range TV period.

Overall Score


Scores In Detail

  • 2D Quality 9
  • 3D Quality 9
  • Design 10
  • Features 9
  • Sound Quality 7
  • Value 7


April 10, 2012, 3:49 pm

Is there a specific game mode that reduces the input lag at all?


April 10, 2012, 7:21 pm

@ Badgerio. Yes there is a mode, no it doesn't reduce lag. It says so in the review in the Input Lag section -

''And the 55LM660T continues this theme, taking in the region of 100ms to show pictures - even if you use the provided 'game' preset.''


May 6, 2012, 9:11 pm

A fantastic television by the looks of things. I can't wait for the release of the LG OLED TV.


June 11, 2012, 2:00 pm

Craig, I can't wait either. I've been thinking about their OLED TV almost every day.


July 3, 2012, 1:49 pm

I think LG TVs are a good fit especially for family use. Like you said, this model comes with 4 glasses and each extra pair costs only £5~10 which is remarkably cheaper compared to active 3D glasses. I also like its design. And LG knew how to utilize the design to enhance their picture quality.


July 11, 2012, 7:34 am

I totatlly fell in love with the design, when I saw it online. However, after seeing in it in person and actually watching the quality images of the TV, I knew it had to be in my living room. Now I am proud owner of it and now it brings the family closer when having movie nights. The kids love the 3D and since the glasses are affordable we bought spare ones.


July 11, 2012, 7:39 am

This thing looks like a painting on the wall. Not only is the design absolutely elegant, but the quality on this TV beast is spectacular. The girlfriend and I rarely go to the theatres when we have all picture perfect and sound quality at home now.


July 18, 2012, 1:37 pm

The LW series were alright but the LM series are amazing. The cinema 3d development brings true 3d to polarized glasses. The design has to be a key point. The bezel is minimized and stylish stand make quite a statement. Motion resolution is spoken to be limited but I haven't faced any kind of issues so far. The price of LM670T is also worth the quality. The rival TV Panasonic TX-L47ET50 is unparalleled price wise.


July 18, 2012, 1:45 pm

The flicker free 3d tv is one of the best experiences. The comfort zone viewing far outweighs any shuttle glasses. There is less stress in to the eyes and it is sensational blur free. The great feature that I really am pleased is the 2d to 3d conversion. I get to watch any channels 3d. Having some friends over for dual play is off the hook. It allows you to view full screen. Some loss of detail in darker areas is shown on the picture but overall since the black level is deep and rich, it is able to be covered. The quality of a smart TV is all shown on this set.


July 18, 2012, 2:03 pm

I love the LM660T. It has great watchable passive 3d. The 2d HD picture is also an outstanding feature. The bezel-free design makes it outstanding, and it has one of the best smart tv system. Smart system provide comprehensive online feature for variety of enjoyable experience. There are some negative in 3d line structure but it is not something that can be pointed out daily. I would buy this right away if possible.

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