I bought my 42LH40 here in Toronto a few weeks ago and am very happy with it. No dead pixels, great picture, and very configurable through the menus.
I thought I would share a couple of settings tweaks that greatly enhance the set for me.
1) I use the digital tuner and get about 10 HD channels with a set-top antenna, they look awesome. However I was getting lots of dropouts in picture and sound, even on channels where the reception is fairly strong. I checked the service menus and there's a tuner option setting which I changed from "Enhanced Ghost" to "Default". Now there are almost no dropouts, and the ones that occur are very minor. I'm not sure why my TV's tuner option was not set to "Default" from the factory. There is another option called "Enhanced Phase", so if you have similar dropout problems try all three.
To get to the required menu: Hold the "Menu" button on the remote and on the TV down together for several seconds until a password prompt appears. Enter the password, normally 0000. Then navigate to the "System" page, "Tuner Option" parameter. Left/right cursor to change settings, then press the back button to exit. Do NOT change any other settings as it is possible to kill your TV this way. If you do so by accident, immediately put back the original value. Write everything down if you need to. The Tuner Option setting is perfectly safe to change though.
2) Out of the box it can play MP3s and JPEG still images via USB, but you can enable USB DivX + Matroska (MKV) movie playback, including full HD 1080p movies from a memory stick or hard drive. This one is better known around the web, see "Instructions on how to activate USB port on your LG TV from Maksim Zubov" on this page:
http : // www. avforums. com /forums/lg-owners-forum/1012225-usb-port-new-lg-lcd-lh-series-25.html
Be careful if you decide to change firmware versions especially if you live in North America, most of the info and firmware files available apply to European LG models.
Note that I did not have to fiddle with software versions, I just got directly into the right menu by pressing the Enter button on the remote and the TV at the same time until a service menu comes up (same password, 0000). This is a different menu than in (1) above. Do not change any other settings - see warnings in (1) above.
Your success with any of this *will* depend on the firmware version your TV has. I have version 4.05.00. Also these tricks may apply to many other LG models.
Ok for balance I'll mention one complaint I have with the TV: It often takes a long or variable time to respond to buttons when navigating menus or changing channels. Minor issue though, I guess the Linux CPU in there is a bit sluggish sometimes. Also I connect through component video so do not suffer from the much lamented HDMI lip sync issue, or even know if it affects my set.