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Re: Sony KV-27S42 27" TV Problem
You are 100% correct, you will need a degaussing coil to take care of this problem. The instructions on how to use it will be included with the degaussing coil.
I hope this helps,
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proceed with this steps and fix it. God bless you Instructions
Turn on your Sony Trinitron television.
Flip the power switch on your degausser.
Maneuver the degausser's coil so that it is a few inches
away from the face of the screen. Draw the center of the degausser coil
around the entire perimeter of the screen, and then return the degausser
to the middle of the screen.
Slowly back away from the Trintron's screen. This serves to
decrease the degausser's impact on the CRT's magnetic field to zero.
Continue backing away until you are about five feet away from the screen
Flip the power switch on your degausser to turn it off. The
CRT's magnetic field should return to its normal state and the picture
quality of your Sony Trinitron should improve.
It must be connected with the color circuit of your tv, a board connected to back end of the tube. Could be dust, cob web or carbon deposit shorting a transistor. Popping noise if loud enough can be attributed to high voltage circuit fault and picture tube.
The most common cause is, shadowmask inside of the CRT is magnetized. It sounds by your description that the TV's internal degausser for the CRT is not working. This is serviceable by a service tech.
Most of the time the cause of a failed degausser is the thermoresistor. This is a common type of failure.
Another cause that can show the fault you are seeing is if the shadowmask in the CRT is defective. Sometimes the mask is damaged when the set is being moved, and is accidently banged against something. The CRT is sensitive to this type of treatement.
If the mask inside of the CRT is defvective, the only fix is a new CRT.
Is good that you hit it and it reacts,very likely you have loose conections in different places but for the distorted picture you need to check the horizontal driver transformer and flyback after that is corrected you need to check the complete chassis for loose conections.Take your time.Good luck.