«

On Sun, 29 Aug 2004 16:43:39 GMT, Barry Watzman
<> wrote:

> From you description, I'd guess it's not the tube and not the flyback.
> Beyond that, very hard to say, but the symptoms suggest problems in
>the horizontal circuitry that drives the flyback and produces high
>voltage. I'm guessing that the high voltage is way low,

Low HV causes the picture to expand.

Tom

>and from loss
>of horiz. hold, the frequency is off. The flyback could cause loss of
>horizontal deflection and high voltage, but would not normally change
>the frequency, so it's more likely in the horiz. circuits that drive the
>flyback than in the horiz. output circuitry, in my view.
>
>
>SBFan2000 wrote:
>> Got a 19" Monitor that was working absolutely flawlessly and is 5 years old.
>> I got up one night to use the little boys room and notice the picture had
>> shrunk horrible and the horizontal hold was going totally nuts. I turned it
>> off waited a few seconds and then turned it back on. It came back on with
>> no problems. I turned it back off and went back to bed.
>>
>> Went to turn it on the next day and it won't display anything not even its
>> own menu. Now I know 5 years isn't young but I remember when monitors
>> lasted a decade! Matter of fact I have two that still work great and are
>> from 1992 and 1994. I have tried everything even opened and turned up
>> internal brightness and contrast on the flyback.
>>
>> What do you expect, Tube? Flyback? Is it worth having fixed.
>>
>> Glenn
>>
>> PS. its got no swollen caps, and least noticably swollen. Also I had
>> recently changed the refresh rate but the setting was still within its
>> specs!
>>
>>

On Sun, 29 Aug 2004 19:43:47 GMT, Barry Watzman
<> wrote:

>In isolation, yes. But in this instance, there were a variety of
>symptoms, which taken together suggest horizontal problems (in the
>drive, rather than the output), and my guess remains that the HV is
>probably low, although I'm guessint that it's other characteristics of
>the problem that are causing the shrunken image.
>

In my experience, even a slight disruption of the H drive signal often
(not always, though) causes the HOT to fail.

This may be a good one to post on sci.electronics.repair.

Tom

>
>Tom MacIntyre wrote:
>> On Sun, 29 Aug 2004 16:43:39 GMT, Barry Watzman
>> <> wrote:
>>
>>
>>>From you description, I'd guess it's not the tube and not the flyback.
>>> Beyond that, very hard to say, but the symptoms suggest problems in
>>>the horizontal circuitry that drives the flyback and produces high
>>>voltage. I'm guessing that the high voltage is way low,
>>
>>
>> Low HV causes the picture to expand.
>>
>> Tom
>>
>>
>>>and from loss
>>>of horiz. hold, the frequency is off. The flyback could cause loss of
>>>horizontal deflection and high voltage, but would not normally change
>>>the frequency, so it's more likely in the horiz. circuits that drive the
>>>flyback than in the horiz. output circuitry, in my view.
>>>
>>>
>>>SBFan2000 wrote:
>>>
>>>>Got a 19" Monitor that was working absolutely flawlessly and is 5 years old.
>>>>I got up one night to use the little boys room and notice the picture had
>>>>shrunk horrible and the horizontal hold was going totally nuts. I turned it
>>>>off waited a few seconds and then turned it back on. It came back on with
>>>>no problems. I turned it back off and went back to bed.
>>>>
>>>>Went to turn it on the next day and it won't display anything not even its
>>>>own menu. Now I know 5 years isn't young but I remember when monitors
>>>>lasted a decade! Matter of fact I have two that still work great and are
>>>>from 1992 and 1994. I have tried everything even opened and turned up
>>>>internal brightness and contrast on the flyback.
>>>>
>>>>What do you expect, Tube? Flyback? Is it worth having fixed.
>>>>
>>>>Glenn
>>>>
>>>>PS. its got no swollen caps, and least noticably swollen. Also I had
>>>>recently changed the refresh rate but the setting was still within its
>>>>specs!
>>>>
>>>>
>>
>>