Power will not turn on. remote and tv power switch will not activate tv. this is the second time this has happened in 2 days. tried several outlets and another power cord. nothing helps. the room power is ok. the tv has always been on a good surge protector. LG 42lh40 LCD is 2.5 yrs old.

Unhook the 2 flat ribbon cables going to the panel boards, power the set on and see if the backlights stay on, also if you're on the correct input you should have sound, this would point to a bad panel and make the set non repairable, the samsung sets, from 55 to 75 inch with NU as the 2nd set of letters in the model had a lot o of panel issues. If you want to go a step farther, hook one ribbon cable up at a time and you should see half a picture on one of the connections

this is very common. it is the power supply going bad. it should run at 130 volts dc. but it is now running much lower that this. just enought for the tv to come on. but not enough to power all the circuits right.

First understand that you need a little patience with this remote, it's a little slow, it may take a few seconds in between pushing buttons for it to react to your TV.

1)
-Turn on TV manually first.

we're going to try and get the remote paired to your particular tv

2)
-Facing RCA universal remote towards TV, press and hold both the POWER and TV buttons on the remote at the same time.. until the RCA universal remote POWER button lights up and is constantly on.

-Then press the PLAY button on RCA universal remote

(POWER button on remote should be blinking after pressing PLAY -- what the remote is doing is trying to program your TV with a list of codes. if your TV does not automatically shut off after a minute, press the PLAY button again. your TV should shut off. wait a few seconds before trying to press PLAY button again if you need to try again.)

3)
Assuming remote turned off TV. Now let's try to get the remote to turn on your TV

On the remote at top right is a REVERSE button, press that. You should see the POWER button on the remote blink once in response to you doing that.

Watch for the power on light on your TV.. your TV may take a few seconds to power on..

Wait a couple seconds. if your TV has not turned back on, press the REVERSE button again. the POWER button should blink once again in response

If your TV did not turn on. You may have to repeat pushing the REVERSE button waiting a couple seconds for the remote to try turning on your TV. For some people this can take several times, if not a dozen times. Just be sure to be patient and wait a couple seconds in between pressing the REVERSE button again. (what the RCA universal remote is doing is going through a list of codes trying to find the right model to pair to)

4)
Assuming the remote finally turned on your TV.. We are almost done. We programmed the remote to turn off the TV and turn on the TV. now we want to press the STOP button on the RCA universal remote to lock in those codes into the remote. After pressing the STOP button the light on the remote POWER button should turn off.

5)
We are done. You should be able to change the channels and raise and lower the volume of your TV.
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Sounds like a loose contact at its main power regulator board. Contact any service technician. Gopakumar Gopalan Google

there is a power service kit available but this must be fitted by a service engineer and is available from www.tvs-services.com

i heard same popping sound and my power button flashed red and will not turn back on.?

not worth buying a remote, you can use an rf converter or what i did was use an old DirecTV remote as i have several. on DTV remote, set selector switch located at top of remote all the way to the right to tv. Then hold down the select and mute button at the same time until the green light blinks 2 times, then enter one of these codes until the power button turns on the tv. Codes are as follows
10236 10463 11463 10179 11911
11929. Also verify that the tv input button does activate the aux channel. I knew these old remotes would come in handy some day.

Good Day, egear00;
Did you try the DMD board? Other wise I'm still looking for solution.
big IRISH.

You have bad solder joints on the circuit board. Check the horz driver transformer, solder these connections. Resolder the connections on the vertical IC. Resolder the connections in the main power supply.