Question about Televison & Video
It sounds that the 'Degaussing" posistor have damaged. It will look somewhat like this.
Posted on Oct 17, 2013
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Posted on Jan 02, 2017
Convergence amp ic bad
Or send to ptscorp.com
Posted on Feb 11, 2008
SOURCE: CRT TV vert section
Vertical linearity is more of a DCV bias issue rather than feedback or AC coupling. Hence it would be more apt to suspect resistors rather than capacitors. Of course, it is also possible that the large IC that drives the Vertical output maybe at fault (least likely) but often would have trimpots for adjustment. Most current designs do away with trimpots and rely on self correcting (feedback loop) which is simply a resistor in the 100k range. In certain instances, it could be a thermistor or resistor or diode limiter attached to the yoke itself.
Best would be to use a service manual or at the very least a schematic diagram with voltage readings and compare actual on PCB against schematic.
If you could post back the make & model or preferably the chassis number of the TV, might be able to comment back known common vertical issues.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on Jun 06, 2008
ok well "tube" tellys as they are called use an electro magnet to keep the picture stable and colours correct its called gaussing now if you have a speaker or something magnetic nearby it will stuff up the colors but only normally producing colors like purple,green, or white
if you have colors across the screen (that aren't caused by magnetic force) then you need to take it to a repairer or decide wether or not to buy a new one this issue can turn out to be quite hard to fix and can be expensive the different colored electron guns may be burning or burnt out causing pale color or it could be as simple as a power transistor in the H.V supply has shorted out..and causing power issues to the tube.
hope this helps,ben
Posted on Aug 13, 2009
SOURCE: colour problems on TV
I think what you have here is a degaussing problem causing purity errors on colours. When you switch your TV on there is a coil around the rear of the tube which is connected to a posistor and this is to get rid of any residual magnetism.
It sounds like the circuit is not working correctly possibly caused by a faulty posistor. Another reason could be that you may be using the set by putting it in standby all the time - the degauss does not work as it should by doing this - the best way is to switch it off properly after use and on again by the switch on the TV itself.
If the problem does not go away, then you'll have to get a service engineer to sort it.
I wish you well with your problem (:-)
Posted on Sep 25, 2009
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