HiTech
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Jul 31, 2007, 8:12 PM
Post #27 of 33
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Re: [KripTed] Toshiba TV Problem, someone help
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Some more information on the subject for you to read.
http://www.repairfaq.org/.../tvfaq/tvdegacrt.htm
http://www.repairfaq.org/sam/crtfaq.htm Poor TV Screen Purity
Poor purity might cause either poor white tone consistency across the screen or it may only be noticeable on totally red, green or blue screens where different coloured blotches appear in certain parts of the screen. Poor white tone consistency in particular seems to be a fairly common problem on large screen Toshiba CRT TV's. To minimise outside magnetic influences which can make the problem worse, always keep sources of magnetic fields like un-magnetically screened HiFi speakers and the like away from your TV by at least 1.5 metres. ONLY Magnetically screened speakers like the ones Toshiba supply as part of the surround sound system, may be placed directly under the TV screen on a cabinet shelf on on top of the TV. Even abiding by these rules, screen blotches on all-white screens can often be a problem on large widescreen TV's and Toshiba seems to be aware of the issue. Various people have told me that Toshiba says such problems are "normal" and "to be expected". To minimise this problem YOU CAN HELP by always keeping the contrast setting of the TV below 70 and brightness preferably below 60. This improves the picture enormously too in terms of improving picture detail. Screen corner blotches are corrected using small stick on 'bow tie' magnets on the tube back. Toshiba should be able to supply purity correction magnets such as these to a professional service engineer to try to correct any serious screen corner white tone consistency problems you may have. The 'bow tie' purity magnet is moved around the screen back with the TV switched on until the white tone consistency is optimised in the affected area, then the magnet is stuck on the tube. A serious risk of electric shock or death is always present when working on TV's with the cover removed. Do not attempt such adjustments yourself. Leave this to a professional qualified TV engineer! ***
*** http://www.stevelarkins.freeuk.com/tvtools.htm
Purity error  
Degaussing coil
Purity
A lack of purity manifests itself by colours that are not the same from one side or corner of the picture to another. It shouldn't have to be checked more than once a month, unless stray magnetic forces have accidentally come near the monitor. Turn off the green and blue beams, leaving only the red. Turn the contrast control to minimum and increase the brightness until a medium bright red raster appears. Look for a uniform colour. If you find a problem, use the degausser switch on the monitor. If you still don't have good results, be certain that no stray magnetic fields are near the monitor, e.g., an audio speaker. The internal degaussing system usually works fine, unless the cabinet itself has become magnetized. If you must use a degaussing coil, here's how. Remove your watch and other magnetically sensitive jewellery and adornments (finger rings, earrings, and other body piercings will probably be okay). Hold the coil about an inch away from the picture tube and/or cabinet. Move the coil in a slow circular motion parallel to the monitor for about 3 to 5 seconds. Back away about 6 feet and turn off the coil while it is perpendicular to the picture tube.
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