Got sound no picture

Check the inter connection wire. Try with an other AV cable.

Wrong category

I believe there may be another setting, it has to do with auto contrast which can make the TV seems to have high contrast ratio but sometime it does not work right, espically on the scene with dark sky with stars, someitme it will will reduce the brightness to make black real black and you can loger see the stars in the scene. I forget the name of this setting, it may be in the user manual. Do you see that in TV HD mode in other movies with a lot of dark scenes?

this is power section problem

check the uhp lamp

just check the problem area
first go to sound setting by click on sond icon on task bar and set the speaker on.
if not get possitive result then chech sond by using head phone make sure sound drivers working properly or not if not then reinstall the sound driver

red, white plugs are for left and right audio..... yellow is video, your tv may not have a video plug, just speaker plugs 

try to fine tune your tv using the remote control, or, if you had knowleged in electronics adjust the sound IF transformer using a wood stick or plastic don't use a metal in adjusting the IF

first thing is sound as welas vidio both are distreb are only sound? make once auto tune are chick your sond system was right ex; bg -dk -i

try this
sounds like the teletext module's

http://forum.eserviceinfo.com/viewtopic.php?p=4626