It seems to be a problem of magnetic field (magnets, loudspeaker... nearby)

In those old TV there was a demagnetizing bobin for demagnetizing the
screen.
It was generally fed with mains through a PTC and a PTN or two PTC.
after some minutes, this circuit is off.

I suppose you get a prblem with this system (Bobin open-circuit ? ).

This bobin is generally in a plstic tube which is rectangular formed and
placed near the edge of the CRT (take care of the VHV, THT in French).

After some minutes, the CRT is demagnetized even if this bobin doesn't
work ; this is due to te electrons sweeping, but it is "a long time" for
the viewer.

You should check the wiring of this bobin

Sometimes the PTC(s) and/or PTN (in a plastic "box" with 3 pins) are
cracked because of their age. you should look for the common pin and
then check each resistor.

Heating this part should increase one and decrease the other or increase
both of them.

Send me a message with your E-mail, I will send you the classic system.



Ivan Vegvary a écritÂ*:
Model LN52A650A1FX2A
A section on the lower right side becomes blurry and ghosty. Intermittent on startup and goes away in about 5-7 minutes.
Know something about electronics, old tube guy, and have equipment.
Any suggestions would be greatly appreciated.