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Re: Yellowish-green area in picture
Its your bulb anyways its just old and needs replacement. As stated by Hitachi's FAQ on the problem your having. call a technician for a new bulb. and have him clean the bulbs and mirror and your fine. since its a hitachi the color guns can only become misaligned if you drop it 10 stories (not really, but just about).
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Hi, this sounds like your TV needs De-Gaussing, the screen has become magnetised and the electrons being fired at the screen are being diverted or scattered and mixed to the area's that are magnetised creating the odd colours, what you need is a de-gaussing coil, you can wave this in a pattern to de-magnetise the screen thus allowing the electrons to flow properly to the screen, it may also be the PTC on the tv's PCB near the mains input, if this is faulty the tv's own degaussing coil may not operate properly, you local TV technician maybe able to help with this as the part is specific to the TV, they maybe able to degauss it too for a small fee.
Here's a better expaliation ---> CLICK HERE <---- it shows a circular pattern here but there are many kinds of pattern magnetism can create but the colours are nearly always the same just in different places witn different strengths.
This is case of colored patches due to magnetic field,check and remove any magnetic thing close to the set, if the same problem is seen than switch off the set by main ON/OFF and switch on after about half hour,if still the problem remains than replace PTC used for de-gaussing,connected with de-gaussing coil mounted around the picture tube i.e electrically removes magnetic field every time TV is switched on.
If you have green patching or anyother colour patching on the screen, your TV may need de-gaussing. The problem is caused when a magnetic field comes close to the TV. A simple solution can often be achieved with a fridge magnet, by moving it over the green patch and pulling it away in certain directions may solve the problem. A TV tech will have a de-gaussing coil which can solve the problem in a matter of minutes.
It could very well be a De-gauss fault, this is caused by magenetic build up. The solution is to try & gat access to a de-gauss coil, you do not have to remove the back of the TV to fix this. If this has no effect then the positor inside the TV at the power supply stage could be at fault or there is the possibility the shadowmask part of the tube is at fault which would result in a replacement tube.
HI... I t sound like the De-gauss circuit has failed. De-gauss demagnetizes the TV tube so you dont get what youre seeing. It could be something as simple as a solder joint on one of the parts in that circuit. I fixed my Panasonic that way
There is an automatic de-gaussing circuit within the TV and it's likely to be the culprit. When the set is first turned on (before you even see a picture) this circuit is active and as it warms up, a thermistor opens up and stops the circuit from operating. It does this because as it heats up it's resistance rises and the circuit stops the current flowing through the de-gaussing coil. Over time from the heat/cool cycle, the connections to the circuit board fail. Simply re-soldering the thermistor is probabaly all that's needed.
Discoloration of this sort is caused by magnetism. All CRT TVs (like yours) have a de-gaussing coil around the picture tube that de-magnetizes the screen (more specifically the shadow mask) every time you turn it on. It is likely that the circuit that controls this coil is at fault. There is probably a cold solder joint where it connects to the main circuit board.
The other scenario is that someone (small child generally) has run a magnetic object very near to the screen, magnetizing the shadow mask (inside the picture tube) and causing a rainbow effect. This is less likely if the rainbow effect is a nice even circular shape. Generally if it's been magnetized by a magnet as described the discolored areas will appear blotchy.
In short, if you have some electronics skills, get in there with your soldering iron and touch up the connections to the de-gaussing coil. If not, find someone who does.
your problem is simple
it is called colour patch.
it is basically due to change in direction or you must have shifted or tilted.
it might be due to magnetic effect like spkr,telephone near by it.just remove from that location.
put of the set for 15 minutes &put it on .problem will get clear.
ask tv tech. to degauss it by dega.coil.it hardly 1 second job.