Hi all

Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right hand
corner. Sometimes they emanate from the corner, but sometimes the direction
seems to reverse towards the corner.
The set is Panasonic CRT model not the latest of course, but an anyone
advise the cause and possible solution (other than replacement).

TIA

Phil

On Mar 5, 12:40*pm, "TheScullster" wrote:
Hi all

Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right hand
corner. *Sometimes they emanate from the corner, but sometimes the direction
seems to reverse towards the corner.
The set is Panasonic CRT model not the latest of course, but an anyone
advise the cause and possible solution (other than replacement).

TIA

Phil

Is this phenomenon present on all channels?

Steve

On 5 Mar, 12:40, "TheScullster" wrote:
Hi all

Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right hand
corner. *Sometimes they emanate from the corner, but sometimes the direction
seems to reverse towards the corner.
The set is Panasonic CRT model not the latest of course, but an anyone
advise the cause and possible solution (other than replacement).

TIA

Phil

Mains hum? Try moving mains and signal cables apart.

Just a thought.

On Wed, 5 Mar 2008 12:40:22 -0000, TheScullster wrote:

Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right
hand corner. Sometimes they emanate from the corner, but sometimes the
direction seems to reverse towards the corner.

That description sounds a bit like RF patterning, a strong local signal
can do it of co-channel from a long way away of the atmospheric
condistions are right.

What are you watching? DSAT, DTTV, DVD/Video if so how are they connected
to the TV. How many boxes have the aerial lead looped through them? Is it
always there? Is it on all channels?

--
Cheers
Dave.

"TheScullster" wrote in message
. uk...
Hi all

Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right
hand
corner. Sometimes they emanate from the corner, but sometimes the
direction
seems to reverse towards the corner.
The set is Panasonic CRT model not the latest of course, but an anyone
advise the cause and possible solution (other than replacement).

TIA

Phil



That sounds like poor scart leads. you need decen quality, seperately
screened leads

"Dave Liquorice" wrote


Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right
hand corner. Sometimes they emanate from the corner, but sometimes the
direction seems to reverse towards the corner.

That description sounds a bit like RF patterning, a strong local signal
can do it of co-channel from a long way away of the atmospheric
condistions are right.

What are you watching? DSAT, DTTV, DVD/Video if so how are they connected
to the TV. How many boxes have the aerial lead looped through them? Is it
always there? Is it on all channels?


Thanks Dave

I did try a bit of deduction/trial and error. Seem to think that this
problem was evident on all channels/sources.
I have Sky (freesat only), Freeview, DVD and terrestrial. The thing is I
haven't altered anything!
Freeview, Sky and DVD are scarted into a multi box, then single scart up to
TV. Selection buttons on multi box dictate which device the TV displays -
bit clunky and non-remote control but it works.
Is it possible or likely that a neighbour's aerials/satellite dishes would
interfere with our reception? Can't see why it should, but they have even
more aerials, dishes etc than me (not that any of them have just been
erected).

Phil

Phil

"Fray McBentos" wrote


Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right
hand
corner. Sometimes they emanate from the corner, but sometimes the
direction
seems to reverse towards the corner.
The set is Panasonic CRT model not the latest of course, but an anyone
advise the cause and possible solution (other than replacement).

TIA

Phil



That sounds like poor scart leads. you need decen quality, seperately
screened leads

As stated in previous response, I don't believe anything has changed, but I
guess I'll start unplugging stuff to see where the fault lies.

Thanks FrB

Phil

TheScullster wrote:
"Dave Liquorice" wrote

Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right
hand corner. Sometimes they emanate from the corner, but sometimes the
direction seems to reverse towards the corner.
That description sounds a bit like RF patterning, a strong local signal
can do it of co-channel from a long way away of the atmospheric
condistions are right.

What are you watching? DSAT, DTTV, DVD/Video if so how are they connected
to the TV. How many boxes have the aerial lead looped through them? Is it
always there? Is it on all channels?


Thanks Dave

I did try a bit of deduction/trial and error. Seem to think that this
problem was evident on all channels/sources.
I have Sky (freesat only), Freeview, DVD and terrestrial. The thing is I
haven't altered anything!
Freeview, Sky and DVD are scarted into a multi box, then single scart up to
TV. Selection buttons on multi box dictate which device the TV displays -
bit clunky and non-remote control but it works.
Is it possible or likely that a neighbour's aerials/satellite dishes would
interfere with our reception? Can't see why it should, but they have even
more aerials, dishes etc than me (not that any of them have just been
erected).

Phil

Phil


is it fixed or moving?

If fixed might be a magnet in the neigbhorhood.

Fixed by removing magnet, and switching TV on and off a few times to
de-gauss.

On Wed, 05 Mar 2008 17:08:10 +0000, The Natural Philosopher wrote:

is it fixed or moving?

The OP says srolling and the angle changes over time.

Magnets or magnetised shadow mask tend to produce wrongly coloured patches
rather than stripes or bands.

--
Cheers
Dave.

on 05/03/2008, TheScullster supposed :
Hi all

Most annoying, the telly is displaying diagonal stripes/bands about 1/2" wide
alternate red and green, sort of scrolling away from bottom right hand
corner. Sometimes they emanate from the corner, but sometimes the direction
seems to reverse towards the corner.
The set is Panasonic CRT model not the latest of course, but an anyone advise
the cause and possible solution (other than replacement).

That, combined with your additional comments suggests to me it might be
an earth loop. One the the items connected has some small current
travelling along the outer screen and that small current is inducing
interference onto the cores of the cable which is what is appearing on
the screen. Pull things out one at a time until the problem disappears.

The usual solution is to cut through the outer screen to break the loop
at the end of the cable closest to the output.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

TheScullster wrote:
Hi all

Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right hand
corner. Sometimes they emanate from the corner, but sometimes the direction
seems to reverse towards the corner.
The set is Panasonic CRT model not the latest of course, but an anyone
advise the cause and possible solution (other than replacement).


The TV's permanently-on internal (analogue?) tuner signal is being sent
out of one of the Scart sockets and is coupling and interfering with
signals fed from your external Scarted equipment when in AV mode. You
should be able to disable this output in a TV setting somewhere, or get
individual core screened cables, or snip wires (extreme), or tune the
internal TV channel to somewhere quiet (which it may have been up to
now....)

--
Adrian C

On Wed, 05 Mar 2008 18:38:16 GMT, Harry Bloomfield wrote:

That, combined with your additional comments suggests to me it might be
an earth loop.

Which normally causes hum, hum on a TV screen is a broad bar the rolls
vertically up or down, can even be almost static. Most if not all set top
boxes, DVD, Video machines etc are double insulated so loops are quite a
hard (but not impossible) to create as there is no mains earth to complete
the loop.

I quite like Adrian C's suggestion, worth investigation. Decent quality
individualy screened cables should prevent it but some SCART cables are
just a bundle of cores with a single overall screen, crosstalk heaven...

--
Cheers
Dave.

In message
,
" writes
On 5 Mar, 12:40, "TheScullster" wrote:
Hi all

Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right hand
corner. *Sometimes they emanate from the corner, but sometimes the direction
seems to reverse towards the corner.
The set is Panasonic CRT model not the latest of course, but an anyone
advise the cause and possible solution (other than replacement).

TIA

Phil

Mains hum? Try moving mains and signal cables apart.

More like beats, IWHT

Local oscillators of two different devices interfering with each other

--
geoff

In article ,
TheScullster wrote:
Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right
hand corner. Sometimes they emanate from the corner, but sometimes the
direction seems to reverse towards the corner. The set is Panasonic CRT
model not the latest of course, but an anyone advise the cause and
possible solution (other than replacement).

That sounds like RF interference. Another signal is cross modulating with
the wanted one and producing this pattern. It could be from another TV
transmitter and being picked up as a result of unusual propagation
conditions.

--
*The man who fell into an upholstery machine is fully recovered*

Dave Plowman London SW
To e-mail, change noise into sound.

In message , "Dave Plowman (News)"
writes
In article ,
TheScullster wrote:
Most annoying, the telly is displaying diagonal stripes/bands about 1/2"
wide alternate red and green, sort of scrolling away from bottom right
hand corner. Sometimes they emanate from the corner, but sometimes the
direction seems to reverse towards the corner. The set is Panasonic CRT
model not the latest of course, but an anyone advise the cause and
possible solution (other than replacement).

That sounds like RF interference. Another signal is cross modulating with
the wanted one and producing this pattern. It could be from another TV
transmitter and being picked up as a result of unusual propagation
conditions.


Or it could be the UHF output of one of your boxes. Try moving them one
channel.

--
PK
Remove the xtra y from my name in the email address if replying