A large black block fills the screen leaving only an inch of the picture. The sound still plays. Turning it off and back on the picture is fine for a few seconds then the block comes on again.
We have a magnavox with smart sound. It is turning on and after a few seconds, a large square black block comes in the middle of the picture with the sound and a rim around with the remaining picture still showing.
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Without a picture of it it's hard to say what you mean. Sometimes on a CRT TV the vertical scan doesn't fill the screen, but that would cause a black band both top and bottom. The usual cause is a capacitor drying out. But only a qualified tech should look into that.
I cannot say enough about this model. There is a bad capacitor or two in this set. You should be looking for a buldged cap at maybe 25 or 35 volts at 2200Mfs. Replace this and the next one near would be a 35 volt at 1200 Mfs. I have a question for you, if the model number is 42 MF, the screen is large. And yet you say it has a 19 inch screen. I'm not sure if you have the large TV or the small TV. The answer I give you is for the large screen. Hope this helps you! Thanks for asking and show a few hands of support!
Hi, IK circuit is engaging which basically means the picture tube is getting tired, the only "fix" is temporary (may get another year out of it). You have to increase the "screen control clockwise".
Remove back of set, follow large black or red wire attatched to picture tube down to the flyback transformer, mounted on flyback are two black controls, one is focus (leave it alone) the other is "screen", adjust it clockwise approx. 1/4 inch, remember that this is a high voltage circuit so use one hand in the set the other hand out of the set at all times,any questions ? e-mail me back, good luck, BMW Rider
You can turn up the Screen controls in back of set. Look for the focus block that has 6 controls on it. 3 are for the screen and 3 for the focus, in each color Red, Blue, Green. need to turn evenly to keep color balanced. On set turn color all the way down and then get a good black and white picture.