USB Port on TVs

On 25/08/2020 00.31, Roger Blake wrote:
On 2020-08-23, Mark Lloyd wrote:
The "power" switch on most modern electronic devices is a lie.

No, it is not.

The real insanity is that on a lot of modern equipment the pilot light
is on when the set it turned off. I really don't get it.

To indicate that the mains cable is connected and there are some
circuits inside with power. Without that little power, remote
controllers can not work.


For example, the power switch on a computer works on DC at low voltage,
so it needs the power supply to provide a little power. The alternative
would be to have AC cabling going from the PSU in the back to somewhere
accessible in the front, at mains voltage, and subject to AC legal
requirements and rules, different on each country. You, the end user,
would not be allowed to open a computer. The computer would have a
warning about electrical shock near the screws.

So, choose your poison.

--
Cheers, Carlos.

On 2020-08-24, Carlos E.R. wrote:
To indicate that the mains cable is connected and there are some
circuits inside with power. Without that little power, remote
controllers can not work.

On every piece of electronic equipment I've owned from 60 to maybe 10 or
so years ago, if there was a pilot light it would be off when the equipment
was off and on when the equipment was turned on. (Radios, tape recorders,
televisions, test equipment, just about anything.) That is the way it
should be.

--
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On 8/24/20 5:31 PM, Roger Blake wrote:
On 2020-08-23, Mark Lloyd wrote:
The "power" switch on most modern electronic devices is a lie.

The real insanity is that on a lot of modern equipment the pilot light
is on when the set it turned off. I really don't get it.

I have seen some like that. Perhaps when "on" you have other ways you
can tell it's on (and so don't need the indicator). The indicator is
showing that while the device is "off", it still actually has power and
can respond to the remote.

--
Mark Lloyd
http://notstupid.us/

"just think of the tragedy of teaching children not to doubt." --
Clarence Darrow

On 8/24/20 6:54 PM, Carlos E.R. wrote:
On 25/08/2020 00.31, Roger Blake wrote:
On 2020-08-23, Mark Lloyd wrote:
The "power" switch on most modern electronic devices is a lie.

No, it is not.

If so, how would the device respond to the remote control? IR receivers
don't work without power. A PC may have an timer circuit that can turn
it on at a certain time. That wouldn't work if the PC was actually OFF.

The real insanity is that on a lot of modern equipment the pilot light
is on when the set it turned off. I really don't get it.

To indicate that the mains cable is connected and there are some
circuits inside with power. Without that little power, remote
controllers can not work.

And the "power switch" hasn't done what it claimed to do. I have
actually measured the power consumption of a cable box and was unable to
tell a difference in power consumption between on and "off".

For example, the power switch on a computer works on DC at low voltage,
so it needs the power supply to provide a little power.

Which fails to ft the definition of "off". On many desktop PCs, you can
achieve OFF with the hard power switch on the back (or unplug it).

The alternative
would be to have AC cabling going from the PSU in the back to somewhere
accessible in the front, at mains voltage, and subject to AC legal
requirements and rules, different on each country. You, the end user,
would not be allowed to open a computer. The computer would have a
warning about electrical shock near the screws.

PCs used to have real power switches, and there was no problem opening
the computer. There was also no exposure to line voltage, since the
switch was on a permanently attached cord.

So, choose your poison.

--
Mark Lloyd
http://notstupid.us/

"just think of the tragedy of teaching children not to doubt." --
Clarence Darrow

On 25/08/2020 02.59, Mark Lloyd wrote:
On 8/24/20 6:54 PM, Carlos E.R. wrote:
On 25/08/2020 00.31, Roger Blake wrote:
On 2020-08-23, Mark Lloyd wrote:
The "power" switch on most modern electronic devices is a lie.

No, it is not.

If so, how would the device respond to the remote control? IR receivers
don't work without power. A PC may have an timer circuit that can turn
it on at a certain time. That wouldn't work if the PC was actually OFF.

But it is not a lie. Some circuits remain powered, some not. It would be
a lie if all circuits remained powered.


The real insanity is that on a lot of modern equipment the pilot light
is on when the set it turned off. I really don't get it.

To indicate that the mains cable is connected and there are some
circuits inside with power. Without that little power, remote
controllers can not work.

And the "power switch" hasn't done what it claimed to do. I have
actually measured the power consumption of a cable box and was unable to
tell a difference in power consumption between on and "off".

I can measure the difference on most devices. On some, the specs do tell
the power consumption while "off", even in the various "off" modes.


For example, the power switch on a computer works on DC at low
voltage, so it needs the power supply to provide a little power.

Which fails to ft the definition of "off". On many desktop PCs, you can
achieve OFF with the hard power switch on the back (or unplug it).

The alternative would be to have AC cabling going from the PSU in the
back to somewhere accessible in the front, at mains voltage, and
subject to AC legal requirements and rules, different on each country.
You, the end user, would not be allowed to open a computer. The
computer would have a warning about electrical shock near the screws.

PCs used to have real power switches, and there was no problem opening
the computer. There was also no exposure to line voltage, since the
switch was on a permanently attached cord.

So, choose your poison.



--
Cheers, Carlos.

On 25/08/2020 02.20, Roger Blake wrote:
On 2020-08-24, Carlos E.R. wrote:
To indicate that the mains cable is connected and there are some
circuits inside with power. Without that little power, remote
controllers can not work.

On every piece of electronic equipment I've owned from 60 to maybe 10 or
so years ago, if there was a pilot light it would be off when the equipment
was off and on when the equipment was turned on. (Radios, tape recorders,
televisions, test equipment, just about anything.) That is the way it
should be.

On many of them, the pilot light is connected to the DC, and if you
check, the AC remains on.

On any "transistor" radio that I have opened, the switch acts on the DC.
The light goes off, but the transformer remains on, with no light.


--
Cheers, Carlos.

In article , Roger Blake
wrote:

On every piece of electronic equipment I've owned from 60 to maybe 10 or
so years ago, if there was a pilot light it would be off when the equipment
was off and on when the equipment was turned on. (Radios, tape recorders,
televisions, test equipment, just about anything.) That is the way it
should be.

a lot of equipment is in standby instead of fully off and needs a way
to indicate that. other products are designed to be used in a dark
environment and have an illuminated power switch to make it easy to
find.

there is no single answer for all products.

use a piece of opaque tape if it bothers you. problem solved.