I have a 18 year old Toshiba (don't know it's history as it's at least 2nd hand TV for me), that I noticed has a permanent colored spot at the bottom left corner, similar to what happens when you pass a powerful magnet by the tube. But there are no magnets (the speakers are far enough away) near the TV. Under the TV is a couple pieces of electronic like a Wii and a reciever and DVD player, but nothing that's not supposed to be by a TV. Any idea what this my be and if there is a solution to this?
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Re: TV shows colored spot at the bottom left corner
The degaussing circuit has failed. Usually this circuit kicks in either when you turn the set on or off. This clears up any magnetic interference on the CRT. Toshiba sets usually have a 3 legged thermistor that controls this. I suspect that this part is defective. The parts cost for this is under $10. Check around for a servicer that can replace it for you.
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This is typically referred to as a color purity problem and can be caused by two main things. The first cause can be stray magnetic fields which can 'magnetize' the TV screen either by something magnetic begint oo close to the screen or having turned the direction of the TV while it is turned on. If this is a purity issue caused by magnetic fields, it can usually be cirrected by powering off the TV for about 1/2 hour and turning it back on. All tube TVs have build in 'degaussing' circuits to cure just this issue.
If this doesn't fix it the other cause is a shifted shadow mask inside the picture tube itself and cannot be corrected.
The most common cause is, shadowmask inside of the CRT is magnetized. It sounds by your description that the TV's internal degausser for the CRT is not working. This is serviceable by a service tech.
Most of the time the cause of a failed degausser is the thermoresistor. This is a common type of failure.
Another cause that can show the fault you are seeing is if the shadowmask in the CRT is defective. Sometimes the mask is damaged when the set is being moved, and is accidently banged against something. The CRT is sensitive to this type of treatement.
If the mask inside of the CRT is defvective, the only fix is a new CRT.
Sorry but you're going to have to be a bit more specific than that.. What kind of Tv is it, what model number, is it the original remote, do you have an otherwise good pic and sound, do functions (vol, ch, power) on the Tv work???
well i think this is caused by a magnetic field created by your speaker. is the speaker the same location for that color burn (lower left corner)? the only way to get rid of that is to remove your speaker or changed it. for all i know speakers used in tv's are magnetically shielded to prevent distortion in the CRT, because their location is usually near the crt. good luck!