TV Trouble: Toshiba Flatscreen CRT (Brazilian model: Linha Face)
I recently purchased a 29" Toshiba CRT Flatscreen TV and I noticed that on bright white scenes with high contrast, after 10-20 seconds, small areas of blue or yellow begin to replace what was once white. Then, when I change the channel, the areas that turned blue or yellow from the previous channel remain to affect the other stations for a few more seconds, almost like round blobs, that slowly disappear with time. I have already replaced the Toshiba twice, and each new TV gives me the same problem, particularly when I view a Closed circuit TV channel (the security channel for my building), which is black and white. The black and white picture eventually develops yellow and blue areas (that were once white in contrast)... similar to when someone puts a magnet near the screen. when changing the channel, and then returning a 3 minutes later, these are gone, but they will re-develop if the TV is left on the channel. Any ideas?
Re: TV Trouble: Toshiba Flatscreen CRT (Brazilian model:...
I suggest if you buy it few months ago that item is under warranty you to call the toshiba service and try to have changed with another one or get free service - delfo
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Check and replace damaged component/s at its main power regulator [SMPS] section circuit. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/
This TV is CRT driven and when the brightness is a issue you would need to diagnose the Blue CRT and or the Fly back transformer.
Many times the transformer is not providing enough power to that CRT witch can cause this to happen.
Without the TV in front of me it would be difficult to pin point.
Also you would want to consider if the TV is out of Focus thus causing this blue tint, Here is a on line part store that can help you in purchasing the parts for the tv if your interested in Do It Yourself repair.
In these cases you should be able to see a
picture by shining a bright light right next to the screen front. Do not put the light there for very long or you will end up
with a permanent bright spot burt onto the screen. I have discovered that applying light pressure with a 3/8" thick rubber or
plastic shim corrects a panel driver board/card solder problem with these TVs. (Removing
the back is required, try light pressure against the card while wearing rubber gloves and tv is then powered on.)
If this is a CRT-based TV and it's been played most of the time, you may have a bad picture tube, especially if strong red colors bleed to the right. CRT's dim with use, unlike LCD or plasma. But it could also be trouble in the video circuits - none of this falls into the DIY category, unfortunately. High voltage involved, unless you're comfortable around it and want to try turning up the screen controls inside the TV. If you do, let me know - but "no response at all" from the external adjustments points to a more serious problem.
sounds like its stuck in another mode. Do you have the original remote to sdee if you can switch off the display section or the closed caption?? good Luck
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