Periphery of screen changes tint

The TCON board or the LCD panel is Faulty , Can confirm by replacing TCON board.
If you wish to get some details; visit the site linked here. Pull up older posts. http://electro-medical.blogspot.com/

according to your observation we called abnormal picture & common mode choke coils are defective l3000,whech are near to LVDS connecter there are 3 coils & must change all coils after replacing these coils your set will ok

This may help you...you can also get an owners manual free on line.


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Using Automatic Picture Settings
Your TV has Three automatic picture settings ("Dynamic", "Standard", "Movie") that are preset at the factory.
You can activate either Dynamic, Standard, Movie by making a selection from the menu.
1. Press the MENU button to display the menu.
Press the ENTER button, to select "Picture".
2. Press the ENTER button to select "Mode".
Press the ??² or ??¼ buttons to select the "Dynamic", "Standard", "Movie" picture
setting. Press the ENTER button.
?³ Choose Dynamic to increase the clarity and sharpness of the picture.
?³ Choose Standard for the standard factory settings.
?³ Choose Movie for a natural Image without picture enhancements.
3. Press the ??² or ??¼ buttons to select "Contrast", "Brightness", "Sharpness",
"Color", or "Tint(G/R)", then press the ENTER button.
4. Press the ??? or ??? buttons to decrease or increase the value of a particular item.
For example, if you select "Contrast", pressing the ??? button increases it.
Press the ENTER button.
Press the EXIT button to exit.
• When you make changes to Contrast, Brightness, Sharpness, Color, Tint(G/R)
the OSD will be adjusted accordingly.
• When in PC mode, Tint, Sharpness, and Color are not available.
Press the P.MODE button on the remote control repeatedly to select the desired
picture mode.
Picture Control
Move Enter Return
Mode : Dynamic ???
Contrast 1 00
Brightness 50
Sharpness 85
Color 55
Tint G 50 R 50
Balck light 1 00
??¼More
TV Picture
Move Enter Return
Mode : Dynamic
Contrast 1 00
Brightness 50
Sharpness 85
Color 55
Tint G 50 R 50
Balck light 1 0
??¼More
TV Picture
Dynamic
Standard
Movie
Move Enter Return
Mode : Dynamic ???
Contrast 1 00
Brightness 50
Sharpness 85
Color 55
Tint G 50 R 50
Balck light 1 0
??¼More
TV Picture
50
??² Con trast ??¼
Move Adjust Return
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Adjusting the Color Tone
You can change the color of the entire screen according to your preference.
1. Press the MENU button to display the menu.
Press the ENTER button to select "Picture".
2. Press the ??² or ??¼ button to select "Color Tone", then press the ENT ER button.
3. Press the ??² or ??¼ button to select "Cool2", "Cool1", "Normal", "Warm1",
or "Warm2".
Press the ENTER button.
When the picture mode is set to Dynamic or Standard, Warm1 and Warm2
cannot be selected. Movie mode is only available.
Move Enter Return
??²More
Color Tone : Cool2 ???
Detailed settings ???
Size : 16 : 9 ???
Digital NR : Low ???
Active Color : On ???
DNle : On ???
Reset : OK ???
TV Picture
Move Enter Return
??²More
Color Tone : Cool2
Detailed settings
Size : 16 : 9
Digital NR : Low
Active Color : On
DNle : On
Reset : OK
TV Picture
Cool2
Cool1
Normal
Warm1
Warm2
Activating Backlight
You can adjust the screen brightness by adjusting the LCD backlight brightness. (0~10)
1. Press the MENU button to display the menu.
Press the ENTER button to select "Picture".
2. Press the ??² or ??¼ button to select "Backlight", then press the ENTER button.
3. Press the ??? or ??? button to decrease or increase the valueof the backlight
brightness.
Press the ENTER button.
Press the EXIT button to exit.
Move Enter Return
Mode : Dynamic ???
Contrast 1 00
Brightness 50
Sharpness 85
Color 55
Tint G 50 R 50
Balcklight 1 0
??¼More
TV Picture
5
??² Balcklight
??¼
Move Adjust Return
Move Enter Return
??²More
Color Tone : Cool2
Detailed settings
Size : 16 : 9
Digital NR : Low
Active Color : On
DNle : Off
Reset : OK
TV Picture
OK
Cancel
Resetting the Picture Settings to the Factory Defaults
1. Press the ??² or ??¼ button to select "Reset", then press the ENTER button.
Press the ??² or ??¼ button to select "Cancel" or "OK" then press the ENTER button.
Press the EXIT button to exit.
Each mode can be reset.

The light engine is going bad. Not related to lamp. Contact Sony. They have been replacing some of these.

I think I have a solution involving far less effort. Have you tuned your picture settings? Out of the box, the settings are ok and the presets will do the trick for most. But if you're like myself, you want the best picture possible. Here are my settings:

Picture menu:
Aspect ratio: Just Size
Energy Saving: Off
Picture Mode: Expert 2
Backlight: 35
Contrast: 90
Brightness: 54
H Sharpness: 40
V Sharpness: 42
Color: 50
Tint: 0

--Expert control menu
Dynamic contrast: Off
Noise reduction: Off
Gamma: Medium
Black level: Low
Real Cinema: On [grayed out]
Color Standard: HD [grayed out]
Color Gamut: Standard
Edge Enhancer: Off
xvYCC: Auto [grayed out]
OPC: Off
Expert Pattern: Off[grayed out]
Color Filter: Off

White balance: Warm
Method: 10 point IRE
Pattern: Outer
IRE: [see below]
Luminance: 137

-- 10 point IRE calibration
IRE: [Red, Green, Blue results, respectively, for each IRE point]
100 [-8, 1, -40]
90 [-13, -5, -40]
80 [-20, -12, -40]
70 [-17, -14, -33]
60 [-17, -12, -31]
50 [-17, -13, -26]
40 [-13, -12, -19]
30 [-6, -4, -8]
20 [-6, -4, -10]
10 [2, 3, -1]

Color management system
Red color: 2
Red tint: 0
Green color: -1
Green tint: -7
Blue color: 2
Blue tint: 7
Yellow color: 0
Yellow tint: 1
Cyan color: 0
Cyan tint: 0
Magenta color: 0
Magenta tint: -2

These are taken from CNET.com

sounds like a magnetic field near your screen

Try adjusting the brightness on the monitor

there is a convergence problem inside the set you will need a good tech.

1) In customer menu, adjust all video controls to center,then
increase "picture" to 3/4
2)Locate focus/screen adjust block above chassis...adjust
RGB screen controls for best mixture = B/W tracking..
Check with customer color level at minimum..should look gray.
If you turn screen controls up too much,you will see faint
re-trace lines in picture.....once B/W looks good,put color level
back to middle...................................................T.

Repair Kit for Hitachi convergence Chassis DP-14G
KIT10 Includes 2 pcs STK392-150 , 1 each of the following 1W axial lead fusible resistors:
http://www.eserviceinfo.com/
http://www.digitalhome.ca/forum/search.php
http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html