LG LM670 (47LM670T) 3D LED LCD TV Review
Will it be third time lucky for the Koreans?
The 47LM670 sits in a sector of the market where LG seems to thrive, just above the middle. In terms of a feature set it lacks little from the higher end sets, with just a reduced backlight modulation frequency and dual core processing of any real note. Of course it’s one of LG’s Cinema 3D TVs and packs in all the Smart TV options we’ve come to expect, as well as the Magic Motion Remote Control to make their use more intuitive. There’s also a very fancy design, Freeview HD and built-in WI-FI to throw in to the list of enticements. Will it be third time lucky for LG? Read on to find out.
Design and Connections
Also in the box is LGs redesigned Magic Motion Remote Control, that now features a very nifty little scroll wheel for zipping through the Home page. The design is extremely simple with just 9 buttons on the face including vol/channel up and down, Standby, 3D, Home and Back. We’re certainly not sold on it as a replacement for a conventional controller for ‘traditional’ TV activities, i.e. just watching the thing, but we’re converts when it comes to the Smart functions.
The LG LM670T has quite a number of Picture Modes – Intelligent sensor, Vivid, Standard, Cinema, Game, isf Expert1, isf Expert2 – with the isf and Cinema modes unsurprisingly providing the most accurate pictures out of the box. All the standard Backlight, Contrast, Brightness and Colour controls are present plus both vertical and horizontal Sharpness controls that we left at default in the Expert modes.
Note: We had to download a Software update for the Tru Motion controls to become apparent in the menus, so if your LM670 isn’t showing them you will need to update over the network or via USB from a file on the LG support website.
Referring to the CIE Chart and, again, overall it’s a good result for the LG 47LM670T but once more it’s problems with red that are causing the issues; it’s considerably off hue to the extent its visibly orange and as a result magenta is being pulled away with it, meaning it’s too purple. We do have a 6-Axis Colour Management System but the red problem may be out of scope for the panel.
As we suspected it wasn’t possible to fix all the errors with red, which points to a limitation of the panel and it remained on the orange side despite our best attempts to pull it away whilst maintaining respectable levels of saturation and luminance. In all other respects the CMS had worked well and the large hue and luminance errors in magenta were able to be corrected but owing to the large amount of red energy in that secondary, we weren’t able to fully saturate. It’s a very good result here for the LM670 but we’d ask LG to get the red pixel right next time.
The LG 47LM670T appears to have inherited most of the good habits displayed by the LM860 and LM960 that went before it but there are certainly some issues with elements of the picture processing. In fact, the LM670 actually flies through most of the standard set of testing and scaled standard definition extremely crisply, picked up on nearly every film cadence thrown at it and deniterlaced video content in both SD and HD signals extremely well but certain patterns did highlight issues they’re not really intended to show.
The Jaggies test on both the Spears and Munsil and HQV discs displayed a lot of artefacting on the moving bar when the signal was set at 50Hz, which bore out our experiences with watching fast paced sports from a 1080i50 broadcast source. With real world content that would manifest as black trails and ghosting artefacts. We’re used to seeing these kind of effects when motion interpolation engines are used but the Tru Motion settings had been left off for these tests. Interestingly, switching the signal to 60Hz instantly cleaned up the artefacting and points to issues with the 50Hz processing. LG, themselves, think the trailing issues are as a result of some problems with the overdrive technology implemented, which is kind of ironic given overdrive is intended to improve panel response and thus motion clarity.
It didn’t stop there, unfortunately, and there were also issues with 1080p24 playback, i.e. most Blu-rays. The LM670 had real issues with the Wedge Pattern test on the Spears and Munsil disc with the 24p cadence, not something we observed with the LM860V that was recently here for testing. The pattern is made up of two wedges made up of alternating fine black and white lines that move around the screen. The lines are supposed to stay stable as they move but the 670 displayed very noticeable ghosting, flicker and trailing. Obviously the test is torturous and very high contrast – bright white against black – but it does indicate there would be issues with real world content too. Popping in a selection of Blu-rays with a lot of dark scenes and we found the manifestation of trailing in a couple of night time firefight scenes from the HBO Pacific Blu-ray Box set where objects moving across the blackened skies would visibly ‘feather’. Again, forcing the Blu-ray player in to 60Hz output cleared up the problems but we’re not keen on the telecine judder it induces. We don’t want to highlight this as too large an issue, it’s not going to be visible on the vast majority of scenes but it is there. In fact we found the problems at 50Hz more severe given they weren’t restricted to extremely high contrast situations.
Before we updated it to the latest software version, the 47LM670 we were testing had a very respectable lag of around 45milliseconds to controller input. Unfortunately, post 03.03.31 software update, that time increased to nearer 68milliseconds, putting it at the higher end of the TVs we’ve tested with the new LagTest device. Hopefully a software upgrade can reverse the process. Note, results are the same with HDMI input labelled as PC or Game.
We averaged the LG 47LM670 to be drawing just 58W in calibrated 2D mode and 75W in default standard 3D mode.
Picture Quality – 2D
What the LG LM670 does do well is colour, slight orange tint to reds excepted, and the calibrated picture packed plenty of believability in to skin tones and land and skyscapes. Despite the lack of oomph from the black levels, images had plenty of stand-out quality thanks to the flat gamma response and we genuinely enjoyed viewing some material. The motion issues with 50Hz material mentioned on the test results page could intrude on to faster paced action and the Tru-Motion settings did nothing but add a soap opera effect over the top of the trailing. Similarly the 24p problem is likely to distract from time to time but we don’t want to overblow it and it’s not something owners will constantly be plagued by. Still, these are things that LG needs to address as there are plenty of TVs out there that don’t show these problems.
It’s a shame about the niggles as generally screen uniformity was pretty good and the prospect of crippling dirty screen effect - our biggest fear going in to the review process – was largely unrealised. We could see the panel array under fast panning on very light sections of the picture but that could be said of just about every LED TV out there. As can be expected with an IPS panel, viewing angles are very generous especially in terms of the colours maintaining fidelity but expect some contrast to be lost when viewed from the sides. Whilst the filter was very good, the LM670 doesn’t handle reflections particularly well. It’s a difficult call for manufacturers who seem to face the choice between allowing the screens to reflect clearly or employ some kind of diffusion that spreads the reflections around and doesn’t give their form clear definition. LG have chosen the second approach with the result that daytime viewing in the recent sunny weather has been nigh on impossible without drawing the curtains. Reflections are certainly indistinguishable as individual objects but that’s at the expense of taking the actual on-screen images with them in a blurry haze.
Picture Quality – 3D
- Lots and lots of well presented features
- Very nice calibrated colour reproduction
- Excellent viewing angles
- 3D is fabulous
- Some very good video processing
- Magic Motion remote control
- Motion artefacting/trailing in 50Hz content
- Problems with high contrast scenes with Blu-ray
- Mediocre dynamic range and shadow detail
- Input lag still too high
- Some panel banding/dirty screen effect
LG LM670 (47LM670T) 3D LED LCD TV Review
It’s a shame we’ve had to devote so much page space to a few issues that come along with the LG 47LM670T as, but for a couple of problems that can really hamper the immersion, it’s actually quite a capable mid-range TV. The problems in question are seemingly panel driving related and we would be hopeful that LG can investigate and act accordingly in releasing a software update to address both the motion trailing issues with 50Hz content and the occasional inability to deal with high contrast material at 1080p24, i.e. most Blu-ray discs, in similar fashion. We would certainly consider the former problem the most intrusive for day to day use but that doesn’t mean the latter can be disregarded, particularly for big movie watchers. Most of the rest of the package was very impressive; an accurate colour palette with even toning, excellent video processing, comparatively good screen uniformity and an excellent range of Smart TV features - all wrapped up in the best GUI we’ve seen to date - will mean the LM670 will certainly find favour with some but, ultimately, we feel that LG needs to address the two highlighted issues, in particular, to meet the needs of the videophile shopping in this market sector.
We found the winged stand found in the higher-end LG LM960 and LM860 didn’t really tickle our fancy but the ‘Ribbon’ of the LM670T is clever bit of design that gives it a very convincing floating look, an idea that seems to be very in vogue with TV designers this year. We liked both the standard remote and the magic motion remote controller, although the latter is best saved for Smart TV duties, of which there are legion. The ‘Card’ system employed on the Home Page makes zipping through the myriad activities a breeze and one can go from browsing the web to streaming 3D content in the time it takes to rotate the scroll wheel on the ‘magic’ controller. You can stream your media files from your home network through the built in Wi-Fi, make recordings from the internal tuner to a USB connected hard drive and even connect your mobile device via apps for iOS and Android. If all that is not enough, the owner can communicate via Twitter or Facebook or, more personally, via video chat through the Skype app.
It’s a little unfortunate that the 20 point white balance controls seemed only effective for the built in calibration patterns but we were still able to extract nigh-on reference greyscale and gamma results. The same can be said for the colour calibration that would have hit reference status but for the panels seemingly inherent orangey reds. Bar the aforementioned panel driving problems, the video processing of the LG LM670 was nothing short of excellent with superb cadence detection, keen deinterlacing and sharp scaling. The software update that enabled the Tru-Motion controls to appear in the menu brought about an unwelcome increase to input lag, for whatever reason, and we wished they’d never bothered as we never could find a happy place with LG’s interpolation engine. The numbers for energy consumption were a darn sight more impressive, however.
The LG 47LM670T is a frustrating little beast. With so much to offer, it’s a shame it lets itself down on what should be fairly routine tasks. In terms of price to performance, we feel the 670 offers a better alternative than either the LM860 or LM960 that went before but it doesn’t quite do enough to gain a badge. If LG can fix the two big issues, we’d happily reconsider.
Contrast/Dynamic Range/Black Level6
2D Picture Quality7
3D Picture Quality9
Ease Of Use8
Value for Money5
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Display LED Backlight Type Edge Display Format 1080p Full HD Screen Size 47 In Resolution 1920 x 1080 Pixels 1080p24 Support Yes 3D Technology Passive Refresh Rate 400 Hz Aspect Ratio 16:9 Viewing Angle 176 Image Enhancement Engine Triple XD Engine
3D Accessories Passive Glasses
Dual View Gaming Yes PVR Features HDD Recording
External PVR Ready
Smart TV Yes Smart TV Features WiDi
Video on Demand Access
File Formats MPEG4
Speakers Stereo Speaker Output 20 Watts Supported Sound Formats Dolby Digital
DSP Sound Features
Energy Efficiency Class A+ Power Consumption 63 Power Consumption (Standby) 0.3 Release Year 2012 Warranty Yes Width (With Stand) 1063 mm Height (With Stand) 700 mm Depth (With Stand) 263 mm Weight 15.3 Kg Width (Without Stand) 1063 mm Height (Without Stand) 627 mm Depth (Without Stand) 33.4 mm
HDMI Type HDMI with ARC
HDMI Inputs 4 Scart Connections 1 Component Inputs 1 Composite Inputs 1 VGA Inputs 1 USB Ports 2 Common Interface Slot Yes Ethernet Port Yes Digital Audio Out Yes Headphone Socket Yes
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