After approx 20 minutes once TV is switched on, the screen distorts with a pin cushion effect - the sides of the picture curve inwards. If the set is left on, the apex of the curves become staggered and the picture that remains, reflects this distortion across the screen. Can you please advise the probable causes and possible cures. I'm an end user with an electronics background presently unable to locate a repair manual.
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You're talking about the pin cushion distortion; I presume. If this is the case, there is a separate circuit to adjust pin cushion distortion. Contact any service technician to rectify this problem. This is a skilled work. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Pin cushion distortion. Contact any service technician. Your TV need a through check up. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Check its "Pin-cushion" section circuit for the fault. An IC is used there to control the pin cushion distortion. If this IC has got faulty, this type of fault can occur. This is actually a skilled work. If you are not ahndy, seek any technicians' support.
Its pin cushion distortion circut had some trouble with it. There is an Ic and one transistor wich controls the pincushion effect. In most cased the trasistor that fitted on a heat sink, will have loose soldering at its terminals. this transistor will heat up during working, and repeated heating an cooling will make solder terminal loose contacted and it is normal fault. locate this transistor, very near to the LOT, resolder its solder terminals by applying a little more solder. It is best to resolder most of the surrounding solder terminals of high watt resistors, without making any solder bridge in between the solder points. If these does not helps you, replace both the IC [an eight solder terminal one, small IC] and the pin out transsistor described earlier at the same time. this will solve your TVs problem. OK.
do you happen to have any speakers of any size within about 3 feet in any direction of the tv??
move them if so,
I have large speakers about 5 feet from my tv at home and i still get some distortion once in a while with red and dark green streaks.