-=PCTechTalk=- Re: My LCD produces too much heat?
- From: "rudy" <rudylopeznc@xxxxxxxxx>
- To: <pctechtalk@xxxxxxxxxxxxx>
- Date: Mon, 30 Jun 2008 18:29:54 -0400
Wow G did you detail that or what...in short the more resistance in an
electrical/electronic circuit the more heat it gives off..I will check to
make sure the LCD vents are free from any air contriction. There are no
other appliances in this room but I will make sure the heat isn't rising
from the tower and it seems to be the LCD. I gave my friend my Samsung 19"
LCD and he said there is no heat at all coming off it but now that I think,
it did when I had it so it must be traveling up from the tower..thanks for
the detailed reply.
Rudy
----- Original Message -----
From: "Gman" <gman.pctt@xxxxxxxxx>
To: <pctechtalk@xxxxxxxxxxxxx>
Sent: Saturday, June 28, 2008 8:21 PM
Subject: -=PCTechTalk=- Re: My LCD produces too much heat?
> Rudy,
> No part of my description here takes into account devices that are
> actually designed to produce heat as their basic function such as electric
> clothes dryers, electric space heaters, electric water heaters, etc..
> Those
> intentionally convert electricity into heat. I will only be discussing
> unintentional heat generation here.
>
> At its simplest form (and within the context of electronics and the
> components it brings to life), operational heat is generated as a result
> of
> friction at the molecular level. As current travels through a wire, there
> is a certain amount of resistance as electrons jump from one atom to the
> next on their way to the other end of the line. While most of the
> electricity will reach its intended target (the appliance at the end of
> the
> line) and be converted into other types of energy (it'll make a blender
> spin
> or a washing machine pump water), this resistance results in a little bit
> of
> heat (and a subsequent loss of a small amount of that initial electrical
> potential) that actually warms up the wire. Attach too many appliances to
> the same extension cord and it'll REALLY heat up, so much that it becomes
> a
> fire hazard since the heat generated can eventually melt the protective
> insulator and cause a short circuit or worse.
>
> With electronic components such as a CPU, they are made up primarily of
> microscopic transistors that are constantly turning on and off to direct
> data through itself. The switching is accomplished by applying a voltage
> to
> what is called a gate. Depending on the type of transistors employed, the
> presence of voltage at the gate allows current to pass from one side of
> the
> transistor to the other. The absence of voltage will instead turn the
> transistor off. Since there are hundreds of millions of transistors in a
> modern CPU and those switches operate at astronomical speeds (measured in
> Ghz.), a LOT of heat is produced by all of the miniscule resistances
> present
> throughout the processor. As more transistors are added to CPU designs
> and
> the faster they make the chip, the more heat it will produce simply
> because
> there will be more places for resistance to fight against the flow of
> electricity. Fortunately, they have been working towards reducing the
> size
> of the transistors used in these beasts. Each reduction in transistor
> size
> allows them to operate using less electricity and that means less
> electrical
> resistance and therefore less heat.
>
> I could go into a lot of additional examples, but I think those two
> should help explain that the heat originally produced is a product of the
> electricity that never gets to be used for whatever the component is
> supposed to do. Operational heat results in the loss of a tiny percentage
> of the actual electricity used by the component or system, even if the
> heat
> produced is almost unbearable.
>
> As far as your LCD goes, there are fluorescent lamps behind the window
> you stare at all day. They operate by exciting the electrons within a gas
> inside a vacuum sealed tube when voltage is applied to them. This gas has
> a
> much smaller resistance than the filament found in incandescent bulbs (the
> screw in type found in many table lamps), so they don't natively produce
> anywhere near as much heat as incandescent lamps. They also cannot
> produce
> anywhere near as much heat as your tower. Just consider the fact that
> your
> Hanns only uses 49 watts Max of electricity (watts = voltage X amperes)
> compared to hundreds of watts being used by the tower. Of course, this
> doesn't mean fluorescent lamps don't get warm over time, just not to the
> degree you are questioning here. LCD monitors and TVs should all have
> vents
> to allow heat to escape rather than build up within the confines of the
> casing. If these vents are covered, clogged, etc., I could see this
> problem
> developing after a while of continuous monitor use. If the vents are
> unobstructed, consider the placement of your tower. Is it possible that
> the
> heat is actually rising up from the back of the tower and making it seem
> like it's coming from the monitor? In our computer room, the two nearly
> constant running towers certainly do act as room warmers as you described,
> but the two LCD monitors add very little to that equation.
>
> Peace,
> G
>
> "The only dumb questions are the ones that are never asked"
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