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PLEASE HELP! TANTALIZING TV TROUBLE

I have a Tobisha TV. It is 32 inches. I do not know when it was made but I would have to say late 90's, maybe 98-99. It is your standard old TV, not one of the new fancy ones that everyone is buying.

Here is the problem.....

The image on the television constantly contracts. The sound is perfect. When you turn the TV on the picture is fine. After a certain amount of time, which is variable and (seemingly) random, the picture slowly condenses to the center of the screen. It would seem like someone is squeezing the picture from the top and the bottom simultaneously. The picture squuezes into a rectangular box in the center of the screen, about 6 inches on the side, while the rest of the tv remains black. There is no squeezing from the left or the right. Sometimes this picture will flutter between 3 inches wide to maybe 9 inches wide on the side. Sometimes while in this state the picture will spontaneously jump back to the full size and stay there for a couple of minutes, only to return inevitably to the condensed version.

Upon smacking the top of the TV with my fist the picture returns to the full screen every time. If i only lightly smack it it will grow larger on the top and the bottom. So smacking fixes the problem temporarily.

I would appreciate any and all input anybody has on this matter. I am determined to get to the bottom of the issue and would not mind attempting to fix the problem on my own. Please let me know if anyone can diagnose the problem and reccommend a possible solution.

Thank you very much,

Best Regards,

Andrew Kotheimer

Reply to
kotheimer3
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snipped-for-privacy@gmail.com ha escrito:

FIRST: DON'T keep using the set like this! you will blow the frame chip. Open it up, resolder the pins on the frame chip (vertical output stage) - you may have to trace it back from the leads on the scan coils round the tube neck. usually the horizontal leads are red and blue and are often fatter; the vertical may be brown and yellow and thinner.

if you can't solder well , get it to a tech, as it stands this is a simple repair but if you nurse it along it will blow parts and turn out more expensive.

-B.

Reply to
b

Check for bad solder around the vertical section, Maybe on the chip, You may need a magnifier Charlie

Reply to
Charlie East

So it's squeezing in on all four sides.

So it's only squeezing in from the top and bottom.

So it's squeezing in on all four sides.

So it's only squeezing in from the top and bottom.

So it's squeezing in on all four sides.

I'd have to guess it's squeezing in on all four sides, since that was the appearance three times and top-and-bottom-only just two times.

--
        Martians drive SUVs!
Reply to
clifto

Reply to
jfetr

I've encountered quite a few problems with electronic gear in the past 50 years -- but NOT ONE of those problems was ever "TANTALIZING"! I envy the OP. ;-)

Reply to
Allodoxaphobia

Nor have I... but I have run into a few "SHOCKING" problems :)

Ken

Reply to
Ken Weitzel

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