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this is commonly known as a frame colapse and could have two possable causes (1) no 28volts comming from the l.o.p.t.x or in english the line output transformer ,to the frame output i/c ,usualy caused by an inline fuse blowing this looks like a very small transistor but with only two legs or (2)the frame output i/c has packed up
This is a problem with the vertical circuit that is usually a defective vertical IC. This part costs $10-$20 and is easily replaced. Sometimes there are capacitors in the same circuit that need to be replaced as well.
THI IS THE INTERNAL CIRCUTRY FAULT BEST YOU
call the service person and dont try to open it other than in side of TV SET HAVING Hazard of electrical shock be handle most care fully .
and check video board and all.
this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!
sound like the screen control on the flyback is set just a little too high. the flyback has the red wire attached to the tube. the flyback has 2 small adjustable controls. if you look close enough 1 is marked focus & on is screen. turn the screen slightly to the left & look at your picture. the screen is like a master brightness & if it's up too high you will see what is called retrace lines.