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TV-Out with FX5200 on Acer 1363WLMi



 
 
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  #1  
Old August 11th 05, 10:01 AM
popodom
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Default TV-Out with FX5200 on Acer 1363WLMi

(la traduction fran=E7aise suit)
Hi all,

I have a Acer Notebook, a 1363WLMi (
http://global.acer.com/products/notebook/as1360.htm ) with a GeForce
FX5200 graphical card.

When I try to connect my laptop using any of the S-VHS or the Composite
connections, I get a poor quality image with white stripes scrolling on
the screen. My television is a Sony 21''.
But I noticed that when I unplug the AC adapter from the notebook,
picture becomes clean (very clean). And when I plug it again, picture
becomes poor again.
I'm living in Belgium so, electrivity comes with 220V in the AC
adapter.

Anyone knows what's the problem ?
Is there a solution to keep the notebook connected to AC adapter and to
television at same time without this problem ?

Thanks a lot,

David Di Fabio
---------------------------------------------------------------------------
Bonjour tout le monde,

Voil=E0, j'ai un portable Acer 1363WLMi (
http://global.acer.com/products/notebook/as1360.htm ) avec une carte
graphique GeForce FX5200.

Quand j'essaye de le connecter =E0 la t=E9l=E9vision, la qualit=E9 de
l'image est vraiment mauvaise, avec des bandes plus claires qui
d=E9filents sur l'=E9cran. J'ai une t=E9l=E9vision Sony 54cm.
J'ai remarqu=E9 que quand j'enl=E8ve le transfo du portable, l'image
devient nette. (tr=E8s nette). Et quand je le rebranche, l'image
redevient mauvaise.

Quelqu'un a une id=E9e sur le probl=E8me ?
Y'a t'il une solution pour garder le portable connect=E9 =E0 la prise
d'=E9lectricit=E9 et =E0 la t=E9l=E9 en m=EAme temps sans avoir ce probl=E8=
me
?

Merci beaucoup,

David Di Fabio

  #2  
Old August 11th 05, 04:08 PM
Phil Weldon
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Posts: n/a
Default

'popodom' wrote, in part:
| When I try to connect my laptop using any of the S-VHS or the
| Composite connections, I get a poor quality image with white stripes
| scrolling on the screen. My television is a Sony 21''.
_____

Is the television PAL (or SECAM)? Is the display adapter set to output PAL
(or SECAM) also?

I do not know why connection to the laptop power supply should make the
difference you describe, but the description does seem similar to how an
NTSC signal might display on a PAL (or SECAM) television.

If the output signal is the correct standard for the television, then the
problem could be bad filtering in the power supply. If possible, try using
the AC male plug without a ground connection.

Phil Weldon

"popodom" wrote in message
oups.com...


  #3  
Old August 12th 05, 06:19 AM
popodom
external usenet poster
 
Posts: n/a
Default

It is a PAL television. And the settings are set to PAL-B... for
Belgium.
So, the settings are good.

If the output signal is the correct standard for the television, then the
problem could be bad filtering in the power supply. If possible, try usi=

ng
the AC male plug without a ground connection.


What do you mean exactly with 'AC male plus without ground connection'
? Sorry, I'm not an expert !

And thanks for your response !

David

Phil Weldon a =E9crit :

'popodom' wrote, in part:
| When I try to connect my laptop using any of the S-VHS or the
| Composite connections, I get a poor quality image with white stripes
| scrolling on the screen. My television is a Sony 21''.
_____

Is the television PAL (or SECAM)? Is the display adapter set to output P=

AL
(or SECAM) also?

I do not know why connection to the laptop power supply should make the
difference you describe, but the description does seem similar to how an
NTSC signal might display on a PAL (or SECAM) television.

If the output signal is the correct standard for the television, then the
problem could be bad filtering in the power supply. If possible, try usi=

ng
the AC male plug without a ground connection.

Phil Weldon

"popodom" wrote in message
oups.com...


  #4  
Old August 12th 05, 06:06 PM
popodom
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Posts: n/a
Default

Ok, I get it...
I tried it and it worked !!!

Thanks a lot for your help.

David
-----------------------------
Bon, ben, le probl=E8me est r=E9solu.
Il semblerait que la prise de terre pose probl=E8me.
Il suffit de brancher le transfo sur une prise sans terre et =E7a marche
!
Une prise sans terre, c'est une prise =E0 2 broches et non 3 broches.

Bien =E0 vous !

David

  #5  
Old August 12th 05, 08:12 PM
Phil Weldon
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Posts: n/a
Default

'popodom' wrote:
| Ok, I get it...
| I tried it and it worked !!!
|
| Thanks a lot for your help.
_____

I am happy the suggestion worked. I am not completely familiar with
European AC plugs, so I could not be more specific with the description
without looking up the shapes. In the USA the AC plugs have two flat blades
(HOT and NEUTRAL) and one round pin (GROUND.) The two flat blades are HOT
and NEUTRAL because the AC wiring is 120 volts in the wall, but 240 volts to
the house, three wires (HOT NEUTRAL HOT), with 120 volts between each HOT
leg and NEUTRAL. In Europe the connectors are various, with two HOT and one
GROUND (EARTH.) In both specifications the GROUND (EARTH) connection is for
safety; it is connected to any metalic chassis so that a fault that delivers
current to the chassis will short to GROUND (EARTH) and cause a fuse to blow
or circuit breaker to trip.

What you were seeing on the screen was the result of a 'ground loop', a
small AC current (50 Hz in Europe) on the TV signal caused by a a small
potential difference between the laptop power supply groundn (earth) and the
TV ground (earth.) The diagonal stripes were the 'beat note' between the
approximate 50 Hz of the power line and the very slightly less than 50 Hz of
the TV field rate.

Lifting the ground (earth) connection at the laptop power supply allows the
laptop/power supply to 'float' to the same potential as the TV. I guess the
problem could also be the TV power supply or ground (earth). It might be a
good idea to get the TV checked for proper grounding and operation, just for
safety, and to avoid damage to your laptop.

Phil Weldon

"popodom" wrote in message
oups.com...
Ok, I get it...
I tried it and it worked !!!

Thanks a lot for your help.

David
-----------------------------
Bon, ben, le problème est résolu.
Il semblerait que la prise de terre pose problème.
Il suffit de brancher le transfo sur une prise sans terre et ça marche
!
Une prise sans terre, c'est une prise à 2 broches et non 3 broches.

Bien à vous !

David


  #6  
Old August 21st 05, 02:18 PM
popodom
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Posts: n/a
Default

Thank you for all you advices...

David

 




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