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After searching for an hour or so I finally came across this answer that worked for the L40A105A To answer your question; First you must set your tv`s input to TV Then open your menu and go to setup and open it You will see "auto setup" open it and you will see "e-pop demo" turn it off .
You can buy a vga to hdmi cable from monoprice.com Although this will only do video. VGA is video only, HDMI supports audio and video. You could, in conjuction get a 3.5 headphone jack to RCA or composite on the same site for sound. Both cables are pretty cheap.
Do a factory reset to this set. Refer its user manual for details. Just unplug the TV from AC mains wall socket, and re-plug it after 10 minutes or so. This must make your TV a hard reset. Do this first. If it do not help you, make a factory reset. The user manual will have all details about how to do this.
it sounds like one of your buffer boards are going bad. these are the boards that help put the picture on the screen. there are 2 boards an upper and a lower board. if you remove one and turn the tv on you will get half a screen. see then if you get the lines. please leave rating after you check.
Before you buy anything try checking the AUDIO Settings in the Menu of Each Device (Mostly TV) and see if they are set to PCM or BITSTREAM.
HDMI is mostly set to PCM while Optical is generally Bitstream.
The TV may be set to the opposite of what it needs to be.
I would try to get PCM to work first cause it is Better, If not then set what you can to Bitstream and it should pass.
Also check in TV Menu for SOUND OUT or AUDIO OUT or SPEAKERS.
Some TV's have a problem passing Audio through when they are already Outputting them to it's own Speakers!
I Hope this Helps out!