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Hi: You may have a problem with the inverters in the unit, they are responsible for lighting up the back panel. Check or have checked the power supply voltage to the inverters, should be around 18-24 volts DC. Also leaky capacitors on the power supply will cause this issue as well as leaky or puffy capacitors on the inverter.
Your set contains three projection tubes (picture tubes) the typical life of these are about half that of a regular picture tube television, around 20,000 hours of operation.
As those tubes age the light emission from them slowly starts to decline. Other symptoms include colors being off slightly or a greenish screen. The symptom you are experiencing is called "contrast loss". That means the difference between bright and dark features in your picture tend to get closer together. This loss of resolution (also the picture might start to get fuzzier then it used to be) is a function of your projection unit wearing out. Since it costs nearly as much to replace a set of tubes (all three must be replaced at the same time) as to replace your set. I would suggest taking your time, read reviews and look for a new set.
Have you tried changing the screen color mode,you can select Daytime for a light background or Nightime for a dark background,or Auto to automatically switch between the two.Touch Tools,Settings,Display.
You should be able to adjust LCD contrast when phone is idle, just use the up/down arrow button to adjust it (don't go off-hook). If you have background music set, the above procedure will adjust the music volume instead. You can turn Background music on and off by pressing <Feature>,2,6 when your phone is idle. Alternatively, you may press <Speaker> 6,0,2 and then use the UP/Down arrow key to adjust LCD contrast.
Picture Mode: Expert1
Fresh Contrast: Off
Noise Reduction: Medium
Black Level: Low
Real Cinema: On
Color Standard: HD (N/A w/HDMI)
White Balance: Warm
**Method: 10-Point IRE
Color Management System
Red Color: 0
Red Tint: 0
Green Color: 0
Green Tint: -15
Blue Color: 0
Blue Tint: 11
Yellow Color: 15
Yellow Tint: 2
Cyan Color: -15
Cyan Tint: 0
Magenta Color: 0
Magenta Tint: -1
lg70 nice tv excellent processor just to bad there is no intensity control on color management oh well still better than what the three s are pushing block out the hype lg will be number 1 in a few years haters are starting to come around and well leds coming,
p.s. i dont work for lg just tired of losers bashing stuff because they dont own it. im isf certified those settings are right on the money straighter than a ruler