Question about Televison & Video
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Posted on Jan 02, 2017
Shrinking picture is a voltage regulation problem in the switch mode power supply, Possibly a cap used in the feedback circuit. Or an over current condition on the B+. This is a very tech intense repair because there is no magic bullet. If it is shrinking on bright scenes then you can bet it is a regulation problem, bright scenes draw more current from the power supply causing this effect. I would not suspect the horiz output because the regulation for this circuit usually comes from the main switch mode power supply. One diagnostic is to monitor the B+ going to the horizontal output and see if it fluctuates. If so you can bet it is a cap or optical coupler in the switch mode circuit.
Posted on Oct 10, 2009
SOURCE: shrinking picture
All symptoms indicate a problem in the vertical circuit,the first thing to look for will be loose conection on the vertical output IC,sometimes this IC goes bad completly and it needs to be replaced.If you are familiar with soldering electronics you can take care of it but if you are not too familiar you can play it safe and take it to a servicer ,it will be a lot less expensive than if they come to your house.Let Us know how it goes or if you need more information.
Posted on Oct 26, 2006
It May be due to one of several things. You could have some bad filter capacitors that are allowing electrical "noise" to disrupt the video, or there could be a bad solder connection or crack in the circuit board allowing a ground to "float", or there could be a problem in the Degaussing circuit, although that would be my last guess. I don't recall ever having that particular problem with any sets in my shop.
Posted on Dec 16, 2006
Hi you have lose solder in yor vertical section have a tech resolder it or that problem will cost you .hope you have already have it remedied.
Posted on Mar 23, 2007
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