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Registered Member #3271
Joined: Mon Oct 04 2010, 02:29AM
Location: Canada
Posts: 159
Nicko wrote ...
Trinitrons have an extremely thin shodow mask - the wires support that.
If they get a sufficient shock, the mask can distort - its happened to me in the past.
At that point, the tube is a lost cause. You might just be lucky, but I'd be surprised.
if Ash is lucky he migth be able to glue small correction magnets as shown above and correct for that. SONY had a kit available to further correct corner purity in the field. At the time these tubes were expensive and also labour intensive to replace. So a lot of us would replace them as a last resort. Otherwise I am affraid you are correct.
I have seen that twice. Once it was a kid that played with a very srong magnet and not only magnetised the mask but distorted it so no amount of degaussing worked. The second was a dropped TV. It broke the casing and distorted a corner CRT mounting bolt holdoff. I am surprised the CRT did not blow up. I worked on the set with safety googles. But the mask had visibly moved in an assymetric fashion in the corner so a magnet correction was out.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
richnormand wrote ...
Ok. Included are two photos of the back of a 32" Sony Trinitron.
You can see near the neck the round magnet being held by a double sided tape against the back of the CRT. There is another one hidden by the electrostatic/blast shield where the yellow circle is. You need a small flashlight to see it.
Second photo is the other side. Same configuration.
The bottom half did have a magnet near each corner and one other in the middle. None near the neck.
The pattern is slightly different for each set or model. The sticky tape is old and it is easy to pry the magnet off (which leave an indication the its location) or the tape off the glass. The ones under the shield would get caught inside it.
Also note the yoke being help in place with one clamp and four rubber wedges that are also glued to the back of the CRT. It could be off position too.
If you do not find any of these loose (degaus coil is not an issue) I would follow the SONY purity adjustment procedure (usually involve pure red screen and pulling the yoke and repositioning it. Resist the temtation of messing around with the convergence adjustments.
Hope thats helps.
This one doesn't appear to have an electro-static/blast shield fitted. The set has a 'Made in Spain' label on it.
I did notice three of the correction magnets that you describe/indicate, two on one side and one on the other. I did look, but could find no trace of marking where others may have been attached, nor any sign of any loose ones.
richnormand wrote ...
Nicko wrote ...
Trinitrons have an extremely thin shodow mask - the wires support that.
If they get a sufficient shock, the mask can distort - its happened to me in the past.
At that point, the tube is a lost cause. You might just be lucky, but I'd be surprised.
if Ash is lucky he migth be able to glue small correction magnets as shown above and correct for that. SONY had a kit available to further correct corner purity in the field. At the time these tubes were expensive and also labour intensive to replace. So a lot of us would replace them as a last resort. Otherwise I am affraid you are correct.
I have seen that twice. Once it was a kid that played with a very srong magnet and not only magnetised the mask but distorted it so no amount of degaussing worked. The second was a dropped TV. It broke the casing and distorted a corner CRT mounting bolt holdoff. I am surprised the CRT did not blow up. I worked on the set with safety googles. But the mask had visibly moved in an assymetric fashion in the corner so a magnet correction was out.
Good luck Ash.....
The TV was being carried 'screen down' at the time it was dropped. One corner hit the ground from a height of several inches. The other three corners were still being supported. It just 'slipped' through the fingers of the person holding that corner.
Maybe I should open it up again and search harder for any 'missing' magnets, but I'm planning on buying some neodymium magnets when I go into town on Friday, if Maplins has any in stock.
Registered Member #3271
Joined: Mon Oct 04 2010, 02:29AM
Location: Canada
Posts: 159
Be a bit careful about the strength of the magnets you get. Particularly if glued on the back of the tube. The ones shown are pretty mild compaired to neodynium magnets. You may have to mount them several inches away. On the other had if the defect is large that may well be what will be needed.
Also. nothing loose on the yoke (small magnets top and bottom on it sometimes)? How about the four purity rings, right beside the yoke input, on the CRT neck. They usually have white paint on them to lock them in place. Should be obvious if the paint is broken or loose..
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Wierd colours on my TV?
