PLEASE HELP! TANTALIZING TV TROUBLE

[[email protected]]

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

 

[b]

[email protected] ha escrito:

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.

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.

 

[Charlie East]

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

 

[clifto]

You've got me confused:

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.

So it's squeezing in on all four sides.

It would seem
like someone is squeezing the picture from the top and the bottom
simultaneously.

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

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.

So it's squeezing in on all four sides.

There is no squeezing from the left or the
right.

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

Sometimes this picture will flutter between 3 inches wide to
maybe 9 inches wide on the side.

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.

 

[[email protected]]

Get yourself an automatic TV smacker and save on repair bills.
Just kidding. I couldn't help myself

 

[Allodoxaphobia]

Get yourself an automatic TV smacker and save on repair bills.
Just kidding. I couldn't help myself

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. ;-)

 

[Ken Weitzel]

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. ;-)

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

Ken