Entertainment Center: TVs, Stereos, VCRs and DVDs - Magnetized TV Screen
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10-01-00, 11:42 PM
I turned on my 10 yr old 27" Sony XBR this morning. The 4 corners of the screen had odd colors. Seems the red color disappeared, and replaced with different shades of green. Is this a magnetized problem, similar to Fannie's, posted 2000-09-09?
For "degausing" tool, are there other household electrical appliance that I can use other than the soldering gun suggested.
I do have a speaker (big Cerwin-Vega) about 2 feet from the TV. It has been there for 6 months without this current problem. Could the speaker be the culprit?
For "degausing" tool, are there other household electrical appliance that I can use other than the soldering gun suggested.
I do have a speaker (big Cerwin-Vega) about 2 feet from the TV. It has been there for 6 months without this current problem. Could the speaker be the culprit?
10-02-00, 07:08 AM
Good Morning, pike:
Yes, it appears that something has destroyed the purity (the ability of the picture tube to reproduce a pure color).
The television set has a degaussing (demagnetizing)circuit built into the electronics. The basic element of the circuit is a field coil of wire around the picture tube screen. It is located on the interior of your set. When the set is energized, the coil is activated briefly to remove any stray magnetism from the screen.
Sometimes the amount of magnetism encountered is too much for the circuit. This happens usually when someone shuts off a vacuum cleaner directly in front of the set. The collapsing magnetic field around the cleaner's motor does terrible things to a color TV screen.
But, since this situation shows all four corners of the picture, I would be inclined to believe that the plastic locking strap on the deflection yoke (on the neck of the picture tube) has broken and the yoke has "slid back" from gravity or weight. In this case, you have to take the back off the set to verify this problem. The yoke has to be positioned correctly on the neck of the picture tube in order for the set to have decent purity (see above).
The second possibility is that the degaussing circuit is not shutting off as it should. If the switching circuit has failed, the coil may stay on all the time and create the same indication you are seeing.
In either case, the problem is not an expensive fix. If the SONY had a good picture and operated well, it is worth the time to fix it. ;)
Smokey
Yes, it appears that something has destroyed the purity (the ability of the picture tube to reproduce a pure color).
The television set has a degaussing (demagnetizing)circuit built into the electronics. The basic element of the circuit is a field coil of wire around the picture tube screen. It is located on the interior of your set. When the set is energized, the coil is activated briefly to remove any stray magnetism from the screen.
Sometimes the amount of magnetism encountered is too much for the circuit. This happens usually when someone shuts off a vacuum cleaner directly in front of the set. The collapsing magnetic field around the cleaner's motor does terrible things to a color TV screen.
But, since this situation shows all four corners of the picture, I would be inclined to believe that the plastic locking strap on the deflection yoke (on the neck of the picture tube) has broken and the yoke has "slid back" from gravity or weight. In this case, you have to take the back off the set to verify this problem. The yoke has to be positioned correctly on the neck of the picture tube in order for the set to have decent purity (see above).
The second possibility is that the degaussing circuit is not shutting off as it should. If the switching circuit has failed, the coil may stay on all the time and create the same indication you are seeing.
In either case, the problem is not an expensive fix. If the SONY had a good picture and operated well, it is worth the time to fix it. ;)
Smokey