My picture started to go bad around the edges. lines and real graine. Now it has started to turn its self off and then 10 sec. latter back on while we are watching it. When i turn it off it sounds like it powers down but the green light on the top comes back on.
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now only visible in a thin horizontal line.
first of all you reduce brightness to monimum.
it just to protect your tv from crt demage.
your problem is in horizontal output section as you have mentioned that week or so ago the right and left bottom edges of the picture began to move in like a sideways triangle filled with black so this sympton is due to hor. section problem.
your flyback transformer or horizontal output might be defective.
but remember check for power supply is ok from
hope this will help.
When the colors are off around the edges on a regular picture tube TV, it usually means that the degaussing thermistor's solder joints have cracked loose. Another possible cause is that a strong magnet, such as in a stereo speaker, was brought very close to the picture tube and has magnetized the tube. Resoldering the solder joints on the degaussing thermistor and demagnetizing the picture tube should put the color back to normal.
If you mean that you get a black box, with a little of the picture visible around the edges, then your closed captions are on and set to TEXT. This puts a black box on the screen about 10 seconds after changing the channel. Go into the menu and turn off the closed captions and the picture will be back to normal.
Well you did start out good, thats cool, now we have to define focus, Is ir blurry around the edges as well as the whole Picture? If it is, it could be the picture tube, A bad solder connection on the tube socket, and yes it could also be the flyback transformer.
No my freind, im afraid that you have bad waveshaper capacitors in the vertical sweep circuit in your TV set. This is not an adjustment. you should have a pro assist you with the repair of this set as it is dangerous because of the high voltage inside these sets.