Quote:
|
Originally Posted by Rickertsen2
Some monitors(especially those made by Sony) ...array of VERY thin phosphor coated wires rather than a plate thing for the apeture grill. If you can see 2-4 VERY VERY thin horizontal lines acroos your screen then your screen uses wires. (the horizontal lines are support wires). Anyway, I put the magnet right up to the screen and bent/tangled/stretched the wires. There are now lots of little thin vertical line across the screen. The reason i mentioned X-rays is that since there are now gaps in the grid, it seems like electrons hittign the side of the gaps in the grid would emit X-rays at anglis in front of the screen. (i know its probably harmless amounts)
|
James,
I work with a man who worked at Sony for many years and this is his opinion...
The high resolution Trinitron tube has a very fine shadow mask to match the small phosphor stripes on the front of the tube. The electrons from the three color guns pass through the slots in the shadow mask at different angles to energize the three color phosphors printed on the inside of the faceplate. The shadow mask is so fine that changes in temperature were affecting the beam landing so Sony introduced a support structure that compensated for the temperature and supported the very fine mask. Those are the two fine black lines you see running horizontally at about a third and two thirds of the screen height. The metal parts of the picture tube are affected by magnetic fields like speaker magnets and the earth's magnetic field. There is a degaussing coil built around the picture tube that generates a moving and variable intesity field, at turn on, that is supposed to erase the magnetic field taken on by the metal parts. What we feel has taken place is the magnet you applied has generated such a strong field, the degaussing coil cannot overcome it. There are coils that are used by service people that can erase this field. What we think is occuring is that the magnetic field on the shadow mask is causing the electrons to strike the black stripes between the color phosphors on the faceplate of the tube and that is what is causing the black vertical strips. If you look close, you should see the there is faint color at the very edges of the black lines. If this is the case, you need to see if you can borrow one of the service deguassing coils or take it to a TV shop and let them try to deguass it.