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This may be a main board issue if the green spot moves. This is repairable. This may be a panel issue if it does not move and it is present on the panasonic splash screen and if it affects the osd menu.
If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
Its a convergence problem. You may want to check the site www.tvrepairkits.com. Every thing they said every description was right on. The best money I ever spent and the confidence you get from doing it yourself, Its a great feeling of achievement not to forget the live messenger support is instantaneous, friendly and informative if you need to fix your tv go to tvrepairkits.com I fixed a philips 60 inch tv in 45 minutes, The convergecne chips were bad thanks a million. You guys saved me 250.00 bucks. I'll be recommending you to everyone I know!
ok so what you need to do is have your tv degaussed...its basicly a strong electric magnet rubbed in fron of ur tv screen..you can buy a degauss for 30 us...or its cheaper to just take it to a tv repair...also some new computer monitors have a degauss setting..put the screens facing each other and hit the degauss funcion on the monitor..do it several times or till u see results.....enjoy
Some Hitachis have developed bad connections on the convergence output IC's (locations IK04 and IK05) You could try and resolder the IC's but if you are in it that far you are best to replace both. The generic part number is STK392-110
Here is what I was able to find out about your problem from sony:
This issue is usually caused by some type of nearby magnetic interference, such as unshielded stereo speakers placed too close to the TV. These spots can be small or large and will normally be red, green or blue, but sometimes appear purple or pink. They normally occur on the sides or corners of the screen, but can also appear in the middle. To resolve this issue, move any stereo speakers or other electronic devices away from the TV; a minimum of 2-3 feet is recommended. If the situation is not remedied immediately, unplug the power cord of the TV from the electrical outlet for 20-30 minutes; repeat this process one more time if the issue is not resolved the first time.
If the issue is still unresolved, service may be required. The Sony® eService Web site at http://eservice.sony.com/ can assist you in obtaining service from a Sony Service Center or locating a Sony Authorized Servicer in your area.
Hope this is helpful:)
IN your statement says tv is second hand and also you tried degausser method also. The problem is permanent magnetic field affected your tv set. So the best recovery is fix one button magnet in the affected area.
You most likely have a burn in on the surface of one of the picture tubes. What you need to do to confirm this, would be to take off the front screen, and with the set turned on, look directly into each one of the lenses, and see if you see a mark on the green or the blue tube. if this is the case, and I am pretty sure it is, the picture tube will need to be replaced, but this set is not a young thing, as the green faint lines is most likely a bad capacitor in the screen drive circuit. If the picture tube is indeed burned on the surface, most likely be better off buying a new TV set. Good Luck
Unplug the set overnight and plug back in and turn the set on . If the spot goes away alittle then do this again. Up to three days > if that dosent fix the problem then you have a problem in the deguissing coil curcuit. Probably a cod joint on the thermister or a bad relay , a bad coil . Not a big deal repair. Good luck