Horizontal scan lines seen on TV

[Samir]

It seems to me that I see horizontal scan lines on TV. They are
white lines and visible clearly whenever the picture is dark or there
is no signal. The image quality behind the lines are still good.
My TV is Samsung CS6818Z. Has anyone experienced this? Has anyone
know how can I fix this?

Thanks in advance,

Samir

 

[sofie]

Samir:
Have you tried backing off on the brightness and contrast a little. What
you described can also be caused by an improperly adjusted screen control on
the flyback high voltage transformer...... read "high voltage".... dangerous
to novices.... electrical shock hazard, etc.
You may want to have an experienced tech do a proper and safe adjustment for
you.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


"Samir" <samir236@hotmail.com> wrote in message
news:952bd024.0312271604.468eb17b@posting.google.com...

It seems to me that I see horizontal scan lines on TV. They are
white lines and visible clearly whenever the picture is dark or there
is no signal. The image quality behind the lines are still good.
My TV is Samsung CS6818Z. Has anyone experienced this? Has anyone
know how can I fix this?

Thanks in advance,

Samir

 

[b]

samir236@hotmail.com (Samir) wrote in message news:<952bd024.0312271604.468eb17b@posting.google.com>...

It seems to me that I see horizontal scan lines on TV(...)Has anyone experienced this? (...) Has anyone
know how can I fix this?

Seen this many times, need to adjust Screen pot on LOPT/ flyback
transformer. Read the FAQ for this newsgroup.If you still arent sure ,
take it to a tech. This is not an expensive problem.
Ben

 

[David]

More than likely you have a failing component in the video output stage scan
derived 200v supply line, capacitor. A simple adjustment is NOT what anyone
should attempt until the parts failures are corrected or ruled out.
David

Samir <samir236@hotmail.com> wrote in message
news:952bd024.0312271604.468eb17b@posting.google.com...

It seems to me that I see horizontal scan lines on TV. They are
white lines and visible clearly whenever the picture is dark or there
is no signal. The image quality behind the lines are still good.
My TV is Samsung CS6818Z. Has anyone experienced this? Has anyone
know how can I fix this?

Thanks in advance,

Samir

 

[Peter Lowrie]

David wrote:

More than likely you have a failing component in the video output stage
scan
derived 200v supply line, capacitor. A simple adjustment is NOT what
anyone
should attempt until the parts failures are corrected or ruled out.
David

Samir <samir236@hotmail.com> wrote in message
news:952bd024.0312271604.468eb17b@posting.google.com...
It seems to me that I see horizontal scan lines on TV. They are
white lines and visible clearly whenever the picture is dark or there
is no signal. The image quality behind the lines are still good.
My TV is Samsung CS6818Z. Has anyone experienced this? Has anyone
know how can I fix this?

Thanks in advance,

Samir

Check retrace (vert)


--
Peter E. Lowrie
----------------------------------------------------------

 

[James Sweet]

"David" <dkuhajda@locl.net.spam> wrote in message
news:3fef5e6b@news.greennet.net...

More than likely you have a failing component in the video output stage
scan
derived 200v supply line, capacitor. A simple adjustment is NOT what
anyone
should attempt until the parts failures are corrected or ruled out.
David

I suppose it should be asked whether this problem appeared suddenly, or if
it was like that when the set was new. It's fairly safe to adjust the sub
brightness/screen control on the flyback, but if the problem cropped up
suddenly there's something else wrong.

 

[Rich Grise]

They're probably the vertical retrace, which is supposed to happen
during the "vertical blanking interval." So it's either an intensity
or contrast adjustment, or something about the vertical sync phase.
TV's used to have a "vertical hold" control, which was nothing but
the vertical osc. freq. control; adjusting it would change what
part of the cycle lined up with the sync. pulse (hence "phase.")

If you can find a pot with a label tha sounds like one of these, you
can probably diddle with them without destroying the set - one
advantage is that you can see the result of your diddling real-time.
You might need a mirror. And a cheater cord.

Have Fun!
Rich

"Samir" <samir236@hotmail.com> wrote in message
news:952bd024.0312271604.468eb17b@posting.google.com...

It seems to me that I see horizontal scan lines on TV. They are
white lines and visible clearly whenever the picture is dark or there
is no signal. The image quality behind the lines are still good.
My TV is Samsung CS6818Z. Has anyone experienced this? Has anyone
know how can I fix this?

Thanks in advance,

Samir

 

[Samir]

Thanks all for the help. This will be my next weekend project


"Rich Grise" <spamdump@nowhere.net> wrote in message news:<Ng8Ib.14142$E17.6571@nwrddc02.gnilink.net>...

They're probably the vertical retrace, which is supposed to happen
during the "vertical blanking interval." So it's either an intensity
or contrast adjustment, or something about the vertical sync phase.
TV's used to have a "vertical hold" control, which was nothing but
the vertical osc. freq. control; adjusting it would change what
part of the cycle lined up with the sync. pulse (hence "phase.")

If you can find a pot with a label tha sounds like one of these, you
can probably diddle with them without destroying the set - one
advantage is that you can see the result of your diddling real-time.
You might need a mirror. And a cheater cord.

Have Fun!
Rich

"Samir" <samir236@hotmail.com> wrote in message
news:952bd024.0312271604.468eb17b@posting.google.com...
It seems to me that I see horizontal scan lines on TV. They are
white lines and visible clearly whenever the picture is dark or there
is no signal. The image quality behind the lines are still good.
My TV is Samsung CS6818Z. Has anyone experienced this? Has anyone
know how can I fix this?

Thanks in advance,

Samir