The first thing I would try is to unplug the TV for about 90 seconds and then see if the TV responds better. The next thing I would do is change out the batteries in the remote and see if perhaps your batteries were going out.
I do see on LG's website that they have a firmware update for that model. If the simpler fixes don't work, you may need to download and install those updates. Here is that site:
http://www.lg.com/us/support-product/lg-42LE5400
Try going in the settings and reset the tv. If that doesn't work contact the mfg.
SOURCE: My LG-37" Flat-Panel LCD HDTV-37LC7D turns on automatically
The main board needs to be replaced.
SOURCE: LG 42LC7D TV does not want to chg channels after 5 min of use
There are some inductors that are out of spec. LG's original SB said to replace some of these with a jumper, but it only lasted a couple months.
You need to have the Total Main Assy replaced.
SOURCE: frozen picture on LG LCD 37"
Try One of your working TVS and connect it to your cable outlet of the TV that is having problems. If that TV Does not work then there may be a degraded fitting or the Leg coming of the splitter to that outlet could have a Low Signal Problem
Next Take the First TV that was not working properly and put it on the cable outlet of one of the TVs that is working properly and if the TV set works on that Channel then you know it is not your TV that it must be the cable
SOURCE: 3 year old 42in LG LCD TV scrren went blank
You will either have a fault with the inverter board which drives the backlights or a faulty backlight in the screen. If the problem is a backlight then a replacement screen is the only cure. One or the other is breaking down after it has been opn for a certain period of time, have an engineer call out & check with a tester if it is a screen problem.
SOURCE: No picture or response - LG LCD TV
Hi, I have the exact same problem. I was wondering if you could tell me how you fixed it? Mine is only 2 hours old from the box
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