When I turned it on the blue seems to be real bright and there is a yellow highlights.

if it has a lamp it is not a plasma but a dlp set--burns? sounds to me like a issue with a damaged light engine which the lamp provides light for the picture to.

Televisions covered: all Projection with yellow picture, but not Projection TVs with a yellowish tint surrounding objects in a nearly normal picture.

Yellow = red + green
normal picture = red + blue + green (RGB). See illustration.



Fig. 1 Additive color mixing in an RGB monitor, or RGB Projection TV.

The circuitry powering your blue output, or the blue light engine itself is starting to fail.

Operating Theory:

The lamp module shines a bright light into the optical unit; there are a series of lens and baffles, and at the top of the light engine, a lens puts the picture into a mirror which is reflected onto the screen; All video and color is processed thru the light engine. Blue most commonly fails first, leaving a yellow picture.

its most likely the Blue CRT drive board which is causing the issue since the set would not power up if the Blue CRT itself were bad, so the drive board is the most likliest. You can get the blue CRT drive board from www.tvrepairworld.com

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.

Here is what to do to confirm what problem is, go to black and white program and make sure color adjustment is turned all the way down to zero.

What you are looking for is what color is the screen?


If it a primary a yellow looking screen (all or most) you have bad Glycol in most likely the blue tube. These sets have a sealed area with a sealed area with Glycol (it is like antifreeze and meant to keep the face of the the three picture tubes cool).

What can happen (usually the blue) is it becomes contaminated with bacteria====note, if blue tube is contaminated you will have yellow screen (red and green=yellow.0

The real easy way to confirm if this is the case is with the back removed and access to the three large lens on top of the tubes look into each lens, if the blue one has no picture and looks like a floodlight, but the red and green have a picture, YOU HAVE FOUND OUT YOUR PROBLEM.

I can tell you if this is the case I can tell you what is involved, this most likely is not a do it yourself repair but i can tell you what is needed.

SD TECH

Hi

First check whether all the cables from your dishnetwork are fine and connected firmly.If yes then you'll need to pull off the front of the tv, behind the speaker grill there would be a panel. Remove the panel and check for a black box hanging over there. It has 6 controls on it, 3 are marked as focus and 3 as screen. You'll need to adjust the screen. If you turn these too high you can damage a tube. so we are doing real small adjustments. Turn the color off on the tv and adjust the red, blue & green controls up till you get a fine picture. Also adjust the focus until you get a clear picture.

And, if it doesn't resolve your issue then it is an intermittant blue picture tube, a bad blue driver transistor on the CRT board, a bad connection on the blue crt board, or a problem in the RGB coming from the video jungle IC. A set this age, most likely will run you about 300 to 500 bucks to have this problem fixed, unless it is the picture tube.

Please do accept this solution and revert for further assistance.

Thanks
Rylee

Picture Menu
Picture Mode: Expert1
*Backlight: 16
*Contrast: 83
*Brightness: 53
Sharpness: 50
*Color: 55
*Tint: 0
Expert Control

• Fresh Contrast: Off
• Noise Reduction: Medium
• Gamma: Medium
• Black Level: Low
• Real Cinema: On
• TruMotion: Low
• Color Standard: HD (N/A w/HDMI)
• White Balance: Warm
• **Method: 10-Point IRE
  • 10 IRE
    • **Red: 1
    • **Green: 2
    • **Blue: -16
  • 20 IRE
    • **Red: -6
    • **Green: 0
    • **Blue: -7
  • 30 IRE
    • **Red: -5
    • **Green: 0
    • **Blue: -4
  • 40 IRE
    • **Red: -8
    • **Green: 0
    • **Blue: -4
  • 50 IRE
    • **Red: -4
    • **Green: 4
    • **Blue: -4
  • 60 IRE
    • **Red: -6
    • **Green: 6
    • **Blue: -5
  • 70 IRE
    • **Red: -8
    • **Green: 3
    • **Blue: -10
  • 80 IRE
    • **Red: -8
    • **Green: 7
    • **Blue: -16
  • 90 IRE
    • **Red: -9
    • **Green: 5
    • **Blue: -18
  • 100 IRE
    • **Red: -10
    • **Green: 4
    • **Blue: -9

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

Colorimetre HCFR software
AVC HD 709 calibration disk
Spyder2 colorimeter (I know most prefer the Eye-One meters, but the Spyder2 was available from my job at no cost)

Here are the settings:

PS3 Blu-Ray player

Output Format (HDMI): Y Pb/Cb Pr/Cr (important!!! NOT RGB output)
BD 1080p 24hz Output (HDMI): On (this TV can reproduce video at 48hz for accurate 2:2 pulldown)
Y Pb/Cb Pr/Cr Super White (HDMI): On (not sure if this matters)

42LG50 Settings

Aspect Ratio: Set By Program (Personal Preference)
Picture Mode: Expert 1
Backlight: 50 (Personal Preference)
Contrast: 54
Brightness: 54
Sharpness: 40 (Personal Preference)
Color: 50
Tint: 0

Fresh Contrast: Off
Noise Reduction: Off
Gamma: Medium
Black Level: Low
Real Cinema: On

White Balance: Warm
Method: 10 Point IRE

10 (-3,8,-16)
20 (15,24,-21)
30 (20,36,-22)
40 (3,19,-40)
50 (8,34,-41)
60 (10,50,-20)
70 (-5,50,-8)
80 (-16,50,18
90 (-14,50,30)
100 (-22,38,21)

Red Color: -3
Red Tint: 0
Green Color: 10
Green Tint: 0
Blue Color: 14
Blue Tint: 0
Yellow Color: 0
Yellow Tint: 1
Cyan Color: -11
Cyan Tint: 0
Magenta Color: 0
Magenta Tint: -2

Take time to get used to the settings, you may think the screen looks dull at first. The truth is most people have way too much contrast on their TVs.
These settings will also work for Cable or Dish hookups, in which case you may change the Noise Reduction option to Medium to reduce signal noise.

OR....

2POINT IRE

Backlight: 65
Contrast: 55
Brightness: 45
Sharpness: 50
Color: 45
Tint: 0

Fresh Contrast: Off
Noise Reduction: Off
Gamma: Medium
Black Level: Low
Real Cinema: On

White Balance: Warm
Method: 2 Point

Red Color: 3
Red Tint: 0
Green Color: 9
Green Tint: 2
Blue Color: -1
Blue Tint: 0
Yellow Color: 6
Yellow Tint: 5
Cyan Color: -1
Cyan Tint: 1
Magenta Color: 2
Magenta Tint: -1

The problem seems to be in the part of the process of taking picture when the camera scans the scene for brightness, to correct exposure. Bright regions turn greeny blue when taken. Low light images are usually unaffected. The problem can be testes by waving a dark object in front of the camera just before shooting. This implies that the good image result (if over exposed) is not a faulty CCD. It seems that the camera has trouble determining the colour balance or white brightness and tries to compensate by post processing.

I will look for a further solution.

There is no yellow tube my freind, only a red, blue, and a green one. If its too bright, have you tried to turn down the black level yet or brightmess, and also the contrast. On these sets you don't need to have the brightness up way high, as the contrast does this. If, when you turn down the brightness, and the picture looks dull, you may need to clean off the mirrors, and or the lens for the picture tubes. If that does not help, there could be a problem in the screen drive circuit or the high voltage block. Good Luck Ps Please do not forget to rate this thread.