S-video on TV, getting zapped

B

Bill

Guest
Is it normal to get zapped by the metal shield of this socket when plugged
into the S-video input of a TV? not just a one off either.

This old hos is used specifically for the TV out feature of my video card,
is this going to damage my video card? which is significantly more valuable
than the TV.

More specifically a Sony KV-K29SN21 around 1994 vintage.
 
"Peter_purple" <purple@203.0.178.192>
Bill wrote:

Is it normal to get zapped by the metal shield of this socket when
plugged
into the S-video input of a TV? not just a one off either.

This old hos is used specifically for the TV out feature of my video
card,
is this going to damage my video card? which is significantly more
valuable
than the TV.

More specifically a Sony KV-K29SN21 around 1994 vintage.

If these systems are on different power points then its normal if your
power
points dont share the same ground, and some dvd, vcr players dont have
a ground anyway, they use a 2 wire live/neutral which is supposed to
be double insulated but they use capacitors from live and neutral to
chassis
so they have a leakage current and this builds to a voltage if not
grounded.

So get a ground lead connected *FIRST* otherwise you will get some
volts into a logic sugnal - which will *DAMAGE* it !

If there is no ground point on the TV then make sure the shields are
connected first, its common for around 100v or so to 'float' on systems
where there isnt a ground but the current is low so often you dont feel
anything but is enough to cause damage.

This is all asuming your power point has a ground and its the same
ground as your PC and the TV has only a 2-wire plug, do you have a
multimeter ?
Click to expand...

** Mr Purple is on the right tram - even if he is unsure of the fare
for the trip !

The answer is simply to use another connector on the TV to ground the set
all the time - possibly just the antenna socket or an audio socket.




........... Phil
 
"Peter_purple" <

Phil Allison wrote:


** Mr Purple is on the right tram - even if he is unsure of the
fare
for the trip !


Say wot ? Whats this depricating implication supposed to be about,
Click to expand...

** Cripes, I thought I was being generous to a spastic at Christmas !!!!



The answer is simply to use another connector on the TV to ground the
set
all the time - possibly just the antenna socket or an audio socket.

If there is one.
Click to expand...

** There are always other sockets on a set that has an S-Video connector.



You need to find a proper ground point, some just dont have it.
Click to expand...

** Bovine excreta.



You need to make sure the TV ground is the *same* as the
PC output ground,
Click to expand...

** See above with runny diarrhoea.



because even if the TV is 'grounded' you can still have
many volts causing the TV out of the PC to get a silent zap making it
useless...
Click to expand...


** Who needs LSD when you are "purple" anyhow.




........ Phil
 
Bill wrote:

Is it normal to get zapped by the metal shield of this socket when plugged
into the S-video input of a TV? not just a one off either.

This old hos is used specifically for the TV out feature of my video card,
is this going to damage my video card? which is significantly more valuable
than the TV.

More specifically a Sony KV-K29SN21 around 1994 vintage.
Click to expand...
If these systems are on different power points then its normal if your power
points dont share the same ground, and some dvd, vcr players dont have
a ground anyway, they use a 2 wire live/neutral which is supposed to
be double insulated but they use capacitors from live and neutral to chassis
so they have a leakage current and this builds to a voltage if not grounded.

So get a ground lead connected *FIRST* otherwise you will get some
volts into a logic sugnal - which will *DAMAGE* it !

If there is no ground point on the TV then make sure the shields are
connected first, its common for around 100v or so to 'float' on systems
where there isnt a ground but the current is low so often you dont feel
anything but is enough to cause damage.

This is all asuming your power point has a ground and its the same
ground as your PC and the TV has only a 2-wire plug, do you have a
multimeter ?

--
that is because,

peter purple proclaims

The infamous big dollar scam list of email addresses, growing,
appended here for those nice news bots to collect their email addresses...

benjamin_cole2000@yahoo.com, williams_adebayo@hotmail.com, frpierrejr@yahoo.fr,

"fprohanp" <fprohanp@libero.it>, mariam seseseko <maseko01@yahoo.ca>,
"GEORGE JOHN" <george_500@tiscali.co.uk>, "gerald abam"
<geraldabam@fsmail.net>,
<geraldabam@yahoo.co.uk>, <tariqani_2@gawab.com>, <romesmith@freesurf.fr>,
"tariq ani" <tariqani_2001@fsmail.net>, "Dr. Isa Gambo"
<gamboisa@zwallet.com>,
Rebeka Abubakar <rebekaluv@fsmail.net>, abanigo@justice.com,
abanigo72@swissmail.net
From: "Dr. Ahmed Banigo" <ahmedb@aol.com>, "Dr. Ahmed Banigo"
<abanigo@justice.com>,
"yusuf.mamman" <yusuf.mamman@telstra.com>, yusufmamman@fsmail.net,
akuwilly@fsmail.net, "kwanta douglas" <douglaskwan@mail.com.fr>,
douglaskwan@mail.com.fr,
"TEMBA BAKO NGANBA" <tawandanganba@netscape.net>, "mariam abacha"
<mariam_6666_abacha@fsmail.net>
mariam_6666_abacha@fsmail.net, adetaylor73@yahoo.com.au,
abraham_ojo_chambers@moldova.com
 
Phil Allison wrote:

"Peter_purple" <purple@203.0.178.192
Bill wrote:

Is it normal to get zapped by the metal shield of this socket when
plugged
into the S-video input of a TV? not just a one off either.

This old hos is used specifically for the TV out feature of my video
card,
is this going to damage my video card? which is significantly more
valuable
than the TV.

More specifically a Sony KV-K29SN21 around 1994 vintage.

If these systems are on different power points then its normal if your
power
points dont share the same ground, and some dvd, vcr players dont have
a ground anyway, they use a 2 wire live/neutral which is supposed to
be double insulated but they use capacitors from live and neutral to
chassis
so they have a leakage current and this builds to a voltage if not
grounded.

So get a ground lead connected *FIRST* otherwise you will get some
volts into a logic sugnal - which will *DAMAGE* it !

If there is no ground point on the TV then make sure the shields are
connected first, its common for around 100v or so to 'float' on systems
where there isnt a ground but the current is low so often you dont feel
anything but is enough to cause damage.

This is all asuming your power point has a ground and its the same
ground as your PC and the TV has only a 2-wire plug, do you have a
multimeter ?


** Mr Purple is on the right tram - even if he is unsure of the fare
for the trip !
Click to expand...
Say wot ? Whats this depricating implication supposed to be about,
can you elaborate what you mean by the fare for the trip, I havent
had a trip for a long long time when I when along for the ride ;) ?

The answer is simply to use another connector on the TV to ground the set
all the time - possibly just the antenna socket or an audio socket.
Click to expand...
If there is one.
You need to find a proper ground point, some just dont have it. And you need
to
make sure both grounds are the same potential, hence my question asto
whether you have, or can lay your hands on a multimeter ?
You need to make sure the TV ground is the *same* as the
PC output ground, because even if the TV is 'grounded' you can still have
many volts causing the TV out of the PC to get a silent zap making it
useless...


--
that is because,

peter purple proclaims

The infamous big dollar scam list of email addresses, growing,
appended here for those nice news bots to collect their email addresses...

benjamin_cole2000@yahoo.com, williams_adebayo@hotmail.com,
frpierrejr@yahoo.fr,
"fprohanp" <fprohanp@libero.it>, mariam seseseko <maseko01@yahoo.ca>,
"GEORGE JOHN" <george_500@tiscali.co.uk>, "gerald abam"
<geraldabam@fsmail.net>,
<geraldabam@yahoo.co.uk>, <tariqani_2@gawab.com>, <romesmith@freesurf.fr>,
"tariq ani" <tariqani_2001@fsmail.net>, "Dr. Isa Gambo"
<gamboisa@zwallet.com>,
Rebeka Abubakar <rebekaluv@fsmail.net>, abanigo@justice.com,
abanigo72@swissmail.net
From: "Dr. Ahmed Banigo" <ahmedb@aol.com>, "Dr. Ahmed Banigo"
<abanigo@justice.com>,
"yusuf.mamman" <yusuf.mamman@telstra.com>, yusufmamman@fsmail.net,
akuwilly@fsmail.net, "kwanta douglas" <douglaskwan@mail.com.fr>,
douglaskwan@mail.com.fr,
"TEMBA BAKO NGANBA" <tawandanganba@netscape.net>, "mariam abacha"
<mariam_6666_abacha@fsmail.net>
mariam_6666_abacha@fsmail.net, adetaylor73@yahoo.com.au,
abraham_ojo_chambers@moldova.com
 
Phil Allison wrote:

"Peter_purple"

Phil Allison wrote:

** Mr Purple is on the right tram - even if he is unsure of the
fare
for the trip !


Say wot ? Whats this depricating implication supposed to be about,

** Cripes, I thought I was being generous to a spastic at Christmas !!!!

The answer is simply to use another connector on the TV to ground the
set
all the time - possibly just the antenna socket or an audio socket.

If there is one.

** There are always other sockets on a set that has an S-Video connector.

You need to find a proper ground point, some just dont have it.

** Bovine excreta.

You need to make sure the TV ground is the *same* as the
PC output ground,

** See above with runny diarrhoea.

because even if the TV is 'grounded' you can still have
many volts causing the TV out of the PC to get a silent zap making it
useless...

** Who needs LSD when you are "purple" anyhow.

....... Phil
Click to expand...
have you had a zap or two recently, or are you on accelerated xmas cheer or
hit your noggin on somthun ?



--
that is because,

peter purple proclaims

The infamous big dollar scam list of email addresses, growing,
appended here for those nice news bots to collect their email addresses...

benjamin_cole2000@yahoo.com, williams_adebayo@hotmail.com, frpierrejr@yahoo.fr,
"fprohanp" <fprohanp@libero.it>, mariam seseseko <maseko01@yahoo.ca>,
"GEORGE JOHN" <george_500@tiscali.co.uk>, "gerald abam" <geraldabam@fsmail.net>,

<geraldabam@yahoo.co.uk>, <tariqani_2@gawab.com>, <romesmith@freesurf.fr>,
"tariq ani" <tariqani_2001@fsmail.net>, "Dr. Isa Gambo" <gamboisa@zwallet.com>,

Rebeka Abubakar <rebekaluv@fsmail.net>, abanigo@justice.com,
abanigo72@swissmail.net
From: "Dr. Ahmed Banigo" <ahmedb@aol.com>, "Dr. Ahmed Banigo"
<abanigo@justice.com>,
"yusuf.mamman" <yusuf.mamman@telstra.com>, yusufmamman@fsmail.net,
akuwilly@fsmail.net, "kwanta douglas" <douglaskwan@mail.com.fr>,
douglaskwan@mail.com.fr,
"TEMBA BAKO NGANBA" <tawandanganba@netscape.net>, "mariam abacha"
<mariam_6666_abacha@fsmail.net>
mariam_6666_abacha@fsmail.net, adetaylor73@yahoo.com.au,
abraham_ojo_chambers@moldova.com
 
Is it not because most TV sets have a floating Ground, and a PC is Grounded
to Earth?
If you measure the voltage b/t the S Video Gnd and your PC case it may be
around 10 + volts AC.
Its nothing to do with Power points, its just the design of TV sets, Notice
they only have 2 pin AC plug, there is no direct connection to Ground.??

You should NEVER plug in the Svideo lead with your TV set on as there is a
high chance of ZAPPIES...
Allan

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3fea8648$0$18390$afc38c87@news.optusnet.com.au...
"Peter_purple" <purple@203.0.178.192
Bill wrote:

Is it normal to get zapped by the metal shield of this socket when
plugged
into the S-video input of a TV? not just a one off either.

This old hos is used specifically for the TV out feature of my video
card,
is this going to damage my video card? which is significantly more
valuable
than the TV.

More specifically a Sony KV-K29SN21 around 1994 vintage.

If these systems are on different power points then its normal if your
power
points dont share the same ground, and some dvd, vcr players dont have
a ground anyway, they use a 2 wire live/neutral which is supposed to
be double insulated but they use capacitors from live and neutral to
chassis
so they have a leakage current and this builds to a voltage if not
grounded.

So get a ground lead connected *FIRST* otherwise you will get some
volts into a logic sugnal - which will *DAMAGE* it !

If there is no ground point on the TV then make sure the shields are
connected first, its common for around 100v or so to 'float' on systems
where there isnt a ground but the current is low so often you dont feel
anything but is enough to cause damage.

This is all asuming your power point has a ground and its the same
ground as your PC and the TV has only a 2-wire plug, do you have a
multimeter ?



** Mr Purple is on the right tram - even if he is unsure of the fare
for the trip !

The answer is simply to use another connector on the TV to ground the set
all the time - possibly just the antenna socket or an audio socket.




.......... Phil
Click to expand...
 
Phil, peerhaps you could enlighten me about a similar problem I have.
With my old printer, and current scanner, the USB lead is energised at
what appears to be a reasonably high voltage. if i hold the shell of
the usb lead ( ground) and touch my earthed computer case, or earthed
equaliser, i feel tingling, running the shell over the backs of my
fingers can result in them getting a bit burnt. I can also make teensy
sparks with my finger, same as if I touch the outer shell to my
computer case. WHen i tried to measure thh voltage on the 1000v
setting on my multimeter, it registered 1 for overvoltage. I heard
this is something called capacatative coupling where a voltage is
induced into the chassis. THe (unearthed) scanner uses a cold cathode
tube. THe inverter for such a tube is of a very high frequency, and
high voltage, and can be used to do similar finger tricks with much
greater intensity (outer bit of skin drawing an arc chars, but its
painless) But the printer? the printer was earthed, and I can't think
of any high voltage parts in it, so why would that have been
happening?


On Thu, 25 Dec 2003 17:40:14 +1100, "Phil Allison"
<philallison@optusnet.com.au> wrote:

"Peter_purple" <purple@203.0.178.192
Bill wrote:

Is it normal to get zapped by the metal shield of this socket when
plugged
into the S-video input of a TV? not just a one off either.

This old hos is used specifically for the TV out feature of my video
card,
is this going to damage my video card? which is significantly more
valuable
than the TV.

More specifically a Sony KV-K29SN21 around 1994 vintage.

If these systems are on different power points then its normal if your
power
points dont share the same ground, and some dvd, vcr players dont have
a ground anyway, they use a 2 wire live/neutral which is supposed to
be double insulated but they use capacitors from live and neutral to
chassis
so they have a leakage current and this builds to a voltage if not
grounded.

So get a ground lead connected *FIRST* otherwise you will get some
volts into a logic sugnal - which will *DAMAGE* it !

If there is no ground point on the TV then make sure the shields are
connected first, its common for around 100v or so to 'float' on systems
where there isnt a ground but the current is low so often you dont feel
anything but is enough to cause damage.

This is all asuming your power point has a ground and its the same
ground as your PC and the TV has only a 2-wire plug, do you have a
multimeter ?



** Mr Purple is on the right tram - even if he is unsure of the fare
for the trip !

The answer is simply to use another connector on the TV to ground the set
all the time - possibly just the antenna socket or an audio socket.




.......... Phil
Click to expand...
 
"Arpit" <DONTSPAMMEF00Lneko4@dodo.com.au> wrote in message
news:sr7avv4ongvg8v51gcdig9q1jf4eqb4hte@4ax.com...
Phil, peerhaps you could enlighten me about a similar problem I have.
With my old printer, and current scanner, the USB lead is energised at
what appears to be a reasonably high voltage. if i hold the shell of
the usb lead ( ground) and touch my earthed computer case, or earthed
equaliser, i feel tingling, running the shell over the backs of my
fingers can result in them getting a bit burnt. I can also make teensy
sparks with my finger, same as if I touch the outer shell to my
computer case. WHen i tried to measure thh voltage on the 1000v
setting on my multimeter, it registered 1 for overvoltage. I heard
this is something called capacatative coupling where a voltage is
induced into the chassis. THe (unearthed) scanner uses a cold cathode
tube. THe inverter for such a tube is of a very high frequency, and
high voltage, and can be used to do similar finger tricks with much
greater intensity (outer bit of skin drawing an arc chars, but its
painless) But the printer? the printer was earthed, and I can't think
of any high voltage parts in it, so why would that have been
happening?
Click to expand...
** Sounds fascinating.

Can you get a CRO and have a look at the wavefrom ??

Put a resistor - say 10 kohms from the voltage source to ground and
use the CRO to look at the signal across that resistor.





......... Phil
 
On Fri, 2 Jan 2004 19:02:45 +1100, "Phil Allison"
<philallison@optusnet.com.au> wrote:

"Arpit" <DONTSPAMMEF00Lneko4@dodo.com.au> wrote in message
news:sr7avv4ongvg8v51gcdig9q1jf4eqb4hte@4ax.com...
Phil, peerhaps you could enlighten me about a similar problem I have.
With my old printer, and current scanner, the USB lead is energised at
what appears to be a reasonably high voltage. if i hold the shell of
the usb lead ( ground) and touch my earthed computer case, or earthed
equaliser, i feel tingling, running the shell over the backs of my
fingers can result in them getting a bit burnt. I can also make teensy
sparks with my finger, same as if I touch the outer shell to my
computer case. WHen i tried to measure thh voltage on the 1000v
setting on my multimeter, it registered 1 for overvoltage. I heard
this is something called capacatative coupling where a voltage is
induced into the chassis. THe (unearthed) scanner uses a cold cathode
tube. THe inverter for such a tube is of a very high frequency, and
high voltage, and can be used to do similar finger tricks with much
greater intensity (outer bit of skin drawing an arc chars, but its
painless) But the printer? the printer was earthed, and I can't think
of any high voltage parts in it, so why would that have been
happening?


** Sounds fascinating.

Can you get a CRO and have a look at the wavefrom ??
Click to expand...
During my search for a CRO some months ago someone pointed me to some
PC oscilloscope software, which actually works reasonably well using
the sound card, so I've been using that ever since. I might try using
an old computer running the software, so if the sound card or computer
gets damaged its no big deal.

Put a resistor - say 10 kohms from the voltage source to ground and
use the CRO to look at the signal across that resistor.
Click to expand...
good idea. i'll try that,
thanks,
arpit thomas
........ Phil
Click to expand...
 
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