This is a common problem for the 5-8 years old LG LCD TV, the problem is a defective main board, due to the new part dried out sources, the only way to do is to re-flow the soldering on the main board yourself by using your kitchen oven, this is the procedure:
Re-Flow Soldering Procedure for LG Main Board
1.Pre-heat your kitchen oven to 385 degree (No more than 400 degree);
2.Put the main board on a card board (like a pizza box board) in the oven;
3.Heat it for 10 minutes (No more than 10 minutes);
4.Turn the oven off & leave the door open, at this moment, do not touch or move the board until it colds down to the room temperature.
5.Install the board in the TV & try it out.
SOURCE: Unable to display HDMI Input
Okay so you have the HDMI cables from both the DVD and the Cable box plugged into the reveiver?
SOURCE: LG 42'' TV has no sound but great picture. How do I get the sound?
You shouldn't need anything plugged into the accessory jacks to get local sound from your set.
Go through the main setup menu and check audio settings; they may be set to turn off the internal speakers to send the sound to a home theatre that you apparently don't have.
Most sets have that as a selection and supply L-R audio for an external system and mute the internal speakers.
FYI: The three connectors you mention are coded as follows:
Red - right channel audio
White - left channel audio
Yellow - composite video (contains synchronization signals and video)
These may be input connectors (for external VCR/DVD decks) so check your owner's guide to verify.
SOURCE: LG 47LC7DF Green Light Blinks 16 Times - No Picture or Sound
The lights indicate what the issue is. Kind of like your check engine light in your car tells you something is wrong with the engine.
SOURCE: DVI warnings when you connect HDMI cables
TV IS IN DEMO MODE GO IN OPTIONS MENU OF VIDEO AND TURN OFF. READ OWNERS MANUAL PAGE 80,81,82
SOURCE: LG RU-42PX11 42 plasma TV has black bar
it seems to be a bad connection somewhere but I disconnected the ribbon cable and got a verticle line of snow instead of a blank line. the line is about 34 mm wide and starts 285 mm from the left edge starts on the Blue and goes to the Red pixels. so if they are 1mm wide that would be 34 bands of color.
I would sure like to figure out the solution to this one or I got a TV I need to throw away cause the o'lady is gonna bust my balls if I can't fix this!
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