I have replaced my monitor as the old one had a dodgy mains connection
(somewhere within the monitor) It would cut out and if I wiggled it I
could get it to come back on, with nothing to lose as I have a new one
it is my intention to open it up and if something simple and obvious
then I will repair.
The monitor will have benn lying unused for a few days so is there any
danger (to me) with any electrical discharges? (thinking microwave ovens)

ss was thinking very hard :
I have replaced my monitor as the old one had a dodgy mains connection
(somewhere within the monitor) It would cut out and if I wiggled it I could
get it to come back on, with nothing to lose as I have a new one it is my
intention to open it up and if something simple and obvious then I will
repair.
The monitor will have benn lying unused for a few days so is there any danger
(to me) with any electrical discharges? (thinking microwave ovens)

Is it a CRT or LED type?

CRT type can hold a high voltage for a while..

On 15/10/2017 21:19, Harry Bloomfield wrote:
Is it a CRT or LED type?

CRT type can hold a high voltage for a while..

Its LCD LED (googled as no spec manual)

ss wrote:

On 15/10/2017 21:19, Harry Bloomfield wrote:
Is it a CRT or LED type?

CRT type can hold a high voltage for a while..

Its LCD LED (googled as no spec manual)

There is still a possiblity of some of the power supply electolytics
being charged up to 300V, so it woul be good practice to discharge them
with an insulated probe to a few thousand ohm resistor to earth.
Backlight supplies used to be a potential risk, but I think that's
obsolete technology.

--

Roger Hayter

On 15/10/17 21:05, ss wrote:
I have replaced my monitor as the old one had a dodgy mains connection
(somewhere within the monitor) It would cut out and if I wiggled it I
could get it to come back on, with nothing to lose as I have a new one
it is my intention to open it up and if something simple and obvious
then I will repair.
The monitor will have benn lying unused for a few days so is there any
danger (to me) with any electrical discharges? (thinking microwave ovens)


Probably not. I would think any mains side (400V) caps would have
decayed, but you can find them and use rubber gloves to pop a resistor
across them easily enough



--
"Socialist governments traditionally do make a financial mess. They
always run out of other people's money. It's quite a characteristic of them"

Margaret Thatcher

ss wrote

I have replaced my monitor as the old one had a dodgy mains
connection (somewhere within the monitor) It would cut out
and if I wiggled it I could get it to come back on, with nothing
to lose as I have a new one it is my intention to open it up
and if something simple and obvious then I will repair.

The monitor will have benn lying unused for a few days so
is there any danger (to me) with any electrical discharges?

Nope.

(thinking microwave ovens)

Those are very different risk wise inside them but even
those are fine after being unplugged for a few days.

You taking about on older monitor with a glass tube
or a modern LCD monitor ? Either way, very safe to
have a look inside now to see if there is any obvious
dry joint or cracked trace. No really point with the
older glass tube monitors tho.

"Roger Hayter" wrote in message
...
ss wrote:

On 15/10/2017 21:19, Harry Bloomfield wrote:
Is it a CRT or LED type?

CRT type can hold a high voltage for a while..

Its LCD LED (googled as no spec manual)

There is still a possiblity of some of the power supply electolytics
being charged up to 300V, so it woul be good practice to discharge them
with an insulated probe to a few thousand ohm resistor to earth.
Backlight supplies used to be a potential risk, but I think that's
obsolete technology.

No its not, it died under warranty in one of mine.

On Monday, 16 October 2017 00:12:33 UTC+1, Rod Speed wrote:
ss wrote

I have replaced my monitor as the old one had a dodgy mains
connection (somewhere within the monitor) It would cut out
and if I wiggled it I could get it to come back on, with nothing
to lose as I have a new one it is my intention to open it up
and if something simple and obvious then I will repair.

The monitor will have benn lying unused for a few days so
is there any danger (to me) with any electrical discharges?

Nope.

of course there is, there are PSU caps. Rod wasting everyone's time as always


NT

wrote in message
...
On Monday, 16 October 2017 00:12:33 UTC+1, Rod Speed wrote:
ss wrote

I have replaced my monitor as the old one had a dodgy mains
connection (somewhere within the monitor) It would cut out
and if I wiggled it I could get it to come back on, with nothing
to lose as I have a new one it is my intention to open it up
and if something simple and obvious then I will repair.

The monitor will have benn lying unused for a few days so
is there any danger (to me) with any electrical discharges?

Nope.

of course there is, there are PSU caps.

Which aint gunna hold any charge for days, ****wit child.

I guess if its a flat screen lcd type probably OK same cannot be said for
crt ones though.
The usual failure is on the socket itself or on the item its mounted on
having dry joints where its soldered to the pcb. I prefer those designs
where mechanically stressed items are not on pcbs as it has been my
experience that they are just not as robust when pcb mounted.
I have a set of pc speakers at the moment where the bass unit feeds two
mid/high speakers via a 3.5mm socket and this is now so intermittennt any
attempt to make it work using a pointy thing to respring the contacts, last
about a week. Its a crap pcb mounted plastic heap of crap socket.

Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"ss" wrote in message
...
I have replaced my monitor as the old one had a dodgy mains connection
(somewhere within the monitor) It would cut out and if I wiggled it I could
get it to come back on, with nothing to lose as I have a new one it is my
intention to open it up and if something simple and obvious then I will
repair.
The monitor will have benn lying unused for a few days so is there any
danger (to me) with any electrical discharges? (thinking microwave ovens)

No problems then.
Be a bit careful taking it apart some seem to have been assembled by the
controlled implosion method in that unless you know what bits to support the
removal of the back ends up with a pile of bits and pieces which seem unable
to fit back together without five pairs of hands.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"ss" wrote in message
...
On 15/10/2017 21:19, Harry Bloomfield wrote:
Is it a CRT or LED type?

CRT type can hold a high voltage for a while..

Its LCD LED (googled as no spec manual)

Brian Gaff wrote

I guess if its a flat screen lcd type probably OK same cannot be said for
crt ones though.

Yes it can when its been unplugged for days.

The usual failure is on the socket itself or on the item its mounted on
having dry joints where its soldered to the pcb. I prefer those designs
where mechanically stressed items are not on pcbs as it has been my
experience that they are just not as robust when pcb mounted.

I have a set of pc speakers at the moment where the bass unit feeds two
mid/high speakers via a 3.5mm socket and this is now so intermittennt any
attempt to make it work using a pointy thing to respring the contacts,
last about a week. Its a crap pcb mounted plastic heap of crap socket.

"ss" wrote in message
...
I have replaced my monitor as the old one had a dodgy mains connection
(somewhere within the monitor) It would cut out and if I wiggled it I
could get it to come back on, with nothing to lose as I have a new one it
is my intention to open it up and if something simple and obvious then I
will repair.
The monitor will have benn lying unused for a few days so is there any
danger (to me) with any electrical discharges? (thinking microwave ovens)

On Monday, 16 October 2017 09:53:36 UTC+1, Rod Speed wrote:
Brian Gaff wrote

I guess if its a flat screen lcd type probably OK same cannot be said for
crt ones though.

Yes it can when its been unplugged for days.

But can and do are quite differnt and even if you do touch it there's not going to be a lot of energy stored after a few days capacitoirs that donlt 'leak' are quite expensive and I doubt they;d be the fiorst chocie for a company designing a PSU for a monitor. Better to be safe than sorry, yuo could always put on side of a meter to the case and prod about on caps with the + probe see if you get any readings. If you do you could then safely discarge them by connecting them to earth via a resistor.

I did think that there was some form directive/regulation in that you had to have bleed resistors in 'modern' monitors because of this worry.


https://electronics.stackexchange.co...ing-capacitors

GENERAL NOTE:

The usage of bleeding resistors is very common for safety reasons. For example, there are SMPS which utilize huge output capacitors. If you disconnect the load and expose the output pins, these caps can (sometimes) store their charge for minutes. The amount of charge is such that a human touching the outputs can die. In cases like this one, there is common practice to add a bleeding resistor (usually power resistor) in parallel to the output capacitors.

In article ,
wrote:
On Monday, 16 October 2017 00:12:33 UTC+1, Rod Speed wrote:
ss wrote

I have replaced my monitor as the old one had a dodgy mains
connection (somewhere within the monitor) It would cut out
and if I wiggled it I could get it to come back on, with nothing
to lose as I have a new one it is my intention to open it up
and if something simple and obvious then I will repair.

The monitor will have benn lying unused for a few days so
is there any danger (to me) with any electrical discharges?

Nope.

of course there is, there are PSU caps. Rod wasting everyone's time as always


Oddly, I've never come across any SMPS that has considerable change left
in the caps after being switched off for some time.

--
*Why is the man who invests all your money called a broker? *

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

In article ,
pamela wrote:
A sensible price is governed by the price an employer can afford to
pay bearing in mind the employer's need not to make a loss by
employing such a person.

Right. Tesco lean on the farmer to keep milk prices low, so the farmer
leans on the milkmaid to keep profits stable. Good Tory strategy.

--
*If horrific means to make horrible, does terrific mean to make terrible?

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

On Monday, 16 October 2017 18:09:28 UTC+1, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:
On Monday, 16 October 2017 00:12:33 UTC+1, Rod Speed wrote:
ss wrote

I have replaced my monitor as the old one had a dodgy mains
connection (somewhere within the monitor) It would cut out
and if I wiggled it I could get it to come back on, with nothing
to lose as I have a new one it is my intention to open it up
and if something simple and obvious then I will repair.

The monitor will have benn lying unused for a few days so
is there any danger (to me) with any electrical discharges?

Nope.

of course there is, there are PSU caps. Rod wasting everyone's time as always


Oddly, I've never come across any SMPS that has considerable change left
in the caps after being switched off for some time.

they usually don't but they can

In article , "Dave Plowman (News)"
writes
In article ,
pamela wrote:
A sensible price is governed by the price an employer can afford to
pay bearing in mind the employer's need not to make a loss by
employing such a person.

Right. Tesco lean on the farmer to keep milk prices low, so the farmer
leans on the milkmaid to keep profits stable. Good Tory strategy.

And you buy your milk from?
--
bert

whisky-dave wrote
Rod Speed wrote
Brian Gaff wrote

I guess if its a flat screen lcd type probably OK
same cannot be said for crt ones though.

Yes it can when its been unplugged for days.

But can and do are quite differnt

Not in this case.

and even if you do touch it there's not going to be a lot
of energy stored after a few days capacitoirs that donlt
'leak' are quite expensive and I doubt they;d be the fiorst
chocie for a company designing a PSU for a monitor.

And they almost all have a bleed resistor across them anyway.

Sure, those can fail and it not be noticed after they
have failed, but they wont have enough charge on
them to be dangerous after a few days anyway.

Better to be safe than sorry, yuo could always put
on side of a meter to the case and prod about on
caps with the + probe see if you get any readings.

Too mindlessly anal to bother with.

If you do you could then safely discarge them
by connecting them to earth via a resistor.

You wont need to after a few days.

I did think that there was some form directive/
regulation in that you had to have bleed resistors
in 'modern' monitors because of this worry.

Dont recall seeing any that dont, but then I didnt see too
many of the cheapest chinese monitors in the CRT days.

https://electronics.stackexchange.co...ing-capacitors

GENERAL NOTE:

The usage of bleeding resistors is very common for safety reasons.
For example, there are SMPS which utilize huge output capacitors.
If you disconnect the load and expose the output pins, these caps
can (sometimes) store their charge for minutes.

But never for days.

The amount of charge is such that a human touching the outputs can die.

Not after being unplugged for days.

In cases like this one, there is common practice to add a bleeding
resistor (usually power resistor) in parallel to the output capacitors.

On 16/10/2017 18:07, Dave Plowman (News) wrote:
In article ,
pamela wrote:
A sensible price is governed by the price an employer can afford to
pay bearing in mind the employer's need not to make a loss by
employing such a person.

Right. Tesco lean on the farmer to keep milk prices low, so the farmer
leans on the milkmaid to keep profits stable. Good Tory strategy.

Result there are less dairy farmers, and milk maids. Called supply and
demand.

Embargoes on importing milk by Russia don't help in tit for tat sanctions.

wrote in message
...
On Monday, 16 October 2017 18:09:28 UTC+1, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:
On Monday, 16 October 2017 00:12:33 UTC+1, Rod Speed wrote:
ss wrote

I have replaced my monitor as the old one had a dodgy mains
connection (somewhere within the monitor) It would cut out
and if I wiggled it I could get it to come back on, with nothing
to lose as I have a new one it is my intention to open it up
and if something simple and obvious then I will repair.

The monitor will have benn lying unused for a few days so
is there any danger (to me) with any electrical discharges?

Nope.

of course there is, there are PSU caps. Rod wasting everyone's time as
always


Oddly, I've never come across any SMPS that has considerable change left
in the caps after being switched off for some time.

they usually don't but they can

**** all of them can because none of them use ultra low leakage
electros because there is no point in spending much more on those
and they have bleed resistors which ensure it doesnt happen anyway.

You have never had a ****ing clue about the basics.

In article ,
Fredxxx wrote:
On 16/10/2017 18:07, Dave Plowman (News) wrote:
In article ,
pamela wrote:
A sensible price is governed by the price an employer can afford to
pay bearing in mind the employer's need not to make a loss by
employing such a person.

Right. Tesco lean on the farmer to keep milk prices low, so the farmer
leans on the milkmaid to keep profits stable. Good Tory strategy.

Result there are less dairy farmers, and milk maids. Called supply and
demand.

Embargoes on importing milk by Russia don't help in tit for tat
sanctions.

Doesn't say much for the future of this country outside the EU if you
think it makes sense to import milk from Russia.

But then the likes of you probably only think about what you pay for
anything. Not where the money to pay for imports comes from.

--
*A bartender is just a pharmacist with a limited inventory *

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

On Tuesday, 17 October 2017 03:42:49 UTC+1, Rod Speed wrote:
tabbypurr wrote in message
...
On Monday, 16 October 2017 18:09:28 UTC+1, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:
On Monday, 16 October 2017 00:12:33 UTC+1, Rod Speed wrote:
ss wrote

I have replaced my monitor as the old one had a dodgy mains
connection (somewhere within the monitor) It would cut out
and if I wiggled it I could get it to come back on, with nothing
to lose as I have a new one it is my intention to open it up
and if something simple and obvious then I will repair.

The monitor will have benn lying unused for a few days so
is there any danger (to me) with any electrical discharges?

Nope.

of course there is, there are PSU caps. Rod wasting everyone's time as
always


Oddly, I've never come across any SMPS that has considerable change left
in the caps after being switched off for some time.

they usually don't but they can

**** all of them can because none of them use ultra low leakage
electros because there is no point in spending much more on those
and they have bleed resistors which ensure it doesnt happen anyway.

You have never had a ****ing clue about the basics.

I had a vicious shock off a psu cap when I was young enough to be a quarter as fool as you.

On 17/10/2017 10:49, Dave Plowman (News) wrote:
In article ,
Fredxxx wrote:
On 16/10/2017 18:07, Dave Plowman (News) wrote:
In article ,
pamela wrote:
A sensible price is governed by the price an employer can afford to
pay bearing in mind the employer's need not to make a loss by
employing such a person.

Right. Tesco lean on the farmer to keep milk prices low, so the farmer
leans on the milkmaid to keep profits stable. Good Tory strategy.

Result there are less dairy farmers, and milk maids. Called supply and
demand.

Embargoes on importing milk by Russia don't help in tit for tat
sanctions.

Doesn't say much for the future of this country outside the EU if you
think it makes sense to import milk from Russia.

Once again you prove yourself to be an idiot. You know as much about
milk production in Russia as you do of Newtonian/classical mechanics.

There is a milk shortage in Russia. On an idiot would think it makes
sense for us to "import milk from Russia" when we have production of our
own.

Just to show that the EU is exporting cows to Siberia:

https://www.bloomberg.com/news/artic...r-cheaper-milk

But then the likes of you probably only think about what you pay for
anything. Not where the money to pay for imports comes from.

You support Labour, that's your province.

wrote in message
...
On Tuesday, 17 October 2017 03:42:49 UTC+1, Rod Speed wrote:
tabbypurr wrote in message
...
On Monday, 16 October 2017 18:09:28 UTC+1, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:
On Monday, 16 October 2017 00:12:33 UTC+1, Rod Speed wrote:
ss wrote

I have replaced my monitor as the old one had a dodgy mains
connection (somewhere within the monitor) It would cut out
and if I wiggled it I could get it to come back on, with nothing
to lose as I have a new one it is my intention to open it up
and if something simple and obvious then I will repair.

The monitor will have benn lying unused for a few days so
is there any danger (to me) with any electrical discharges?

Nope.

of course there is, there are PSU caps. Rod wasting everyone's time
as
always


Oddly, I've never come across any SMPS that has considerable change
left
in the caps after being switched off for some time.

they usually don't but they can

**** all of them can because none of them use ultra low leakage
electros because there is no point in spending much more on those
and they have bleed resistors which ensure it doesnt happen anyway.

You have never had a ****ing clue about the basics.

I had a vicious shock off a psu cap when I was young

But are too stupid to have noticed that that wasnt after
it had been in a device for days with no power connected.

In article , Mark
writes
On Tue, 17 Oct 2017 14:50:54 +0100, (Roger Hayter)
wrote:

wrote:

On Tue, 17 Oct 2017 10:49:25 +0100, "Dave Plowman (News)"
wrote:


Result there are less dairy farmers, and milk maids. Called supply and
demand.

Embargoes on importing milk by Russia don't help in tit for tat
sanctions.

Doesn't say much for the future of this country outside the EU if you
think it makes sense to import milk from Russia.

That isn't what he said is it, The sanctions against Russia by the EU/US
etc has resulted in them banning imports . Milk and products from it was
exported from here and the EU and is now banned by them.
http://www.fwi.co.uk/business/dairy-...out-russia-ban
-end.htm Russian farmers are delighted, they have developed local versions
of French cheeses etc and are reaping the benefits. Even if the sanctions
get lifted thye hardly to sop production of them.

G.Harman
Irrational prejudice leads me to suspect that Russian cheese would have
a hard time competing with French cheese.

Interesting. I wonder how you would arrange a cheese race? ;-)

International Cheese show largest it the world held in Nantwich Cheshire
annually. (End of plug)
--
bert