Monitor cooling mod for the brave

[donny_paycheck]

So here's what I'm going to try. I am going to cool my monitor with a 120mm 120vac fan. I am going to run this fan from the circuitry inside the monitor. Here's the idea:

I'm going to splice the filament voltage for the picture tube from the connector going to the back of the CRT. There's a big plastic connector on there with 9 wires, but two of them are the 6.3vac for filament cathode heater. I'm going to then apply the 6.3vac to the AC in on a bridge rectifier, which should yield 9 volts dc or so on the output of the BR. I'll filter the valley DC output with a 2200 microfarad electrolytic capacitor and then apply the filtered 9vdc to the coil of a small relay. The whole idea of this is to energize the relay coil when the picture tube comes on. Since the filament is what produces most of the heat inside the monitor, it'll also activate the fan.

The N.O. contacts of the relay will be in series with the fan (an EG&G Rotron Muffin XL 120v 120x35mm) and another splice from the back of the power connector where the 120v comes into the monitor from the power cord. When you push the power button or the monitor comes out of power save mode the filament comes on. The little circuit gets energized and sends 9vdc to the relay, which in turn will close and energize the fan. The fan only comes on when the filament is on, which is how it should ideally work, and what's more it doesn't need an external power source. It's all self-contained inside the monitor!

I'm trying this as soon as I get out to True Value and get a 4 11/16" hole saw for the fan hole. I'll put it in the top of the monitor case(edit*INSIDE on the top). I'll take pics and post them in this thread. I've worked around high voltage electronics plenty so this doesn't scare or worry me. I'll discharge everything, so for those of you who I know are about to reprimand me for being dumb just know that I'm being safe. This will beat those cheesy 12vdc snap-on monitor fans you can buy that run from the case PSU via a long cord. You will hear from me again...

[Ebonyks]

to put it bluntly, why? it seems like putting a heatsink on a NIC

[donny_paycheck]

Originally posted by Ebonyks
to put it bluntly, why? it seems like putting a heatsink on a NIC

Yeah it does, but I see those stupid snap-on monitor fans and think of a better way. I am bored, this is my hobby, so I'm going to experiment.

[Ebonyks]

Ah, so it's one of those things you do simply because you can. I've done a few of those including my crazy voodoo3 mods in july (this july)

[Diggrr]

Sounds like a truly hardcore mod. I don't need to bother, my Proview 19" monitor has a 9v DC power supply already in it. There's an option to hang speakers on it, and it's the amps power supply. (Packard Hell style)
I checked, and it goes off when the monitor goes into sleep mode too. It's even got the cross wiring built in too, so it just needs the sound input wire from the sound card.

Have fun, post pics...:)

[Silversinksam]

Donny,

First this mod unlike what others have stated is an excellent idea and my internal monitor temos have plumeted 10-20 degree's F


I have tried at least a dozen and a half Ac and Dc fans for this to work properly and I have also tried the Monitor cooler that is premade.


Lete me share a few of my issues and solutions that I discovered to save you some headache.


First chances are that the EMI that will be released from the fan IN your monitor will produce waviness.

The only fan that produced no EMI is a Nidec Beta V thermally controlled 4500 DC The Justcooler monitor cooler to its credit did not produce any waviness either.


I gave -Will- the Justcooler Monitor cooler as he was lookin for one and I had one layin around.

The Nidec fan that I use is connected to a ac/dc converter running at 6volts which is totally silent but still cools the monitor very well.......I have a plush towel on my Monitor as my cat sleeps on it(sometimes he sticks his head on the fan as he likes the warm breaze(Good thing it has a grill, right?) but the Fan vectors all the hot air out and the monitor is still cool......I know because i had a temp probe in it for a little while. :)

I did rig the ac/dc converter to turn on when the pc goes on and the key to a monitor cooler is finding a well shielded fan.

If you are unable to find a suitable fan you can try to build a small shroud to suck the hot air out.

I seriously doulbt the a fan inside the monitor will work out for you but am anxious to hear your results.BEFORE YOU CUT THE HOLE, Place the ROTRON FAN ON TOP OF MONITOR and check for 'waviness', as I did try 2 Rotron fans and both were no-go's in terms of being poorly shielded

http://members.home.net/broadbandland/Orb/violet.jpg

[The Overclocker]

i dont see the point. you dont gain anything from doing that, unlike overclocking a computer, you just get more noise

[Silversinksam]

Originally posted by the overclocker
i dont see the point. you dont gain anything from doing that, unlike overclocking a computer, you just get more noise

The point is the monitor runs 20* cooler and will prolong its life, have you priced 21" or larger monitors? They are expensive and if you can keep them healthy then thats good right?

I told you I have my monitor fan running @6volts and its silent.

No noise, longer life.

[Sonny]

Originally posted by the overclocker
i dont see the point. you dont gain anything from doing that, unlike overclocking a computer, you just get more noise You gain longevity.:beer:

[Silversinksam]

Originally posted by sonny
You gain longevity.:beer:



Thanks Sonny, thats exactly what I meant :)


To my surprise this caused no waviness and is what I gave to Will, The only improvment you can make to these is take some tape and tape along its base as thiers a centimeter gap that prevents it from working to its fullest.

http://www.systemlogic.net/reviews/hardware/cooling/justcooler/mc100/i/1.jpg


Reviewhttp://www.systemlogic.net/reviews/hardware/cooling/justcooler/mc100/

[donny_paycheck]

Originally posted by Silversinksam


The point is the monitor runs 20* cooler and will prolong its life, have you priced 21" or larger monitors? They are expensive and if you can keep them healthy then thats good right?

I told you I have my monitor fan running @6volts and its silent.

No noise, longer life.

I forgot about EMI. Good thing you mentioned it; that's a huge thing that I was going to miss...now I'm thinking a low voltage brushless DC fan directly from the ac/dc converter on the filament lines might be a better idea. I'll definitely check the EMI issue. If I can't find a fan that's 'noiseless' EMI-wise, I think I'll try wrapping insect screen around it and grounding the screen as a makeshift shield. Gotta get that hole saw! Also, I got this 21" trinitron for cheap on ebay - factory reconditioned - but they're expensive and prolonging it's life is definitely something that this would help with. Mainly I'm doing this for fun because it's my hobby (yes I know that might not make sense) but it WILL have it's positives. I think I'll put a thermocouple from a digital thermometer in there at first just to get some figures to justify this. It may be a little while but I'll get back to this thread once I have some pics and results from this endeavor. Until then, if anybody thinks of anything such as Sam's EMI reminder, please let me know.

[Stoanhart]

Here's a question for you donny (and lots of others), You say your bored, but you own such a good system. Do lots of you buy a new PC so you can OC, see how fast it can go, but then don't use the computer? I know I will be using mine for games, since that's about the only thing such a good PC is good for.

Just a general wonderment

[donny_paycheck]

Originally posted by Stoanhart
Here's a question for you donny (and lots of others), You say your bored, but you own such a good system. Do lots of you buy a new PC so you can OC, see how fast it can go, but then don't use the computer? I know I will be using mine for games, since that's about the only thing such a good PC is good for.

Just a general wonderment

It seems that way when I'm working on it, but the extra few FPS in UT or Q3A give me bragging rights over my friends with more expensive but stock-configured machines. I use it for a lot of games but that's half the fun. I like putting a new idea together and seeing it actually work. It's a good feeling.

[funnyperson1]

personally i w0ould like to stick an SK6 to my Geforce2, and a Alpha Pal8045 to my NIC:D ....would be cool to brag...but i dont have the money :(

[AntmanMike]

Naw. I would buy 40 vapochills, mod each one, and adapt them for everything in the PC (1 on CPU, 1 on Northbridge, 1 on southbridge, 1 on Graphics card GPU, 2 on each line of GPU RAM, 4 for each of my RAM modules (RDRAM), 2 for both my hard drives (heavy insulation on the HDDs), one on my sound card core, one on my NIC, etcetcetc.

[BillA]

thanks for the info Sam
my 2ed big Hitachi loses color convergence, has a scrolling horizontal black line, etc when it gets warm,
perhaps this will breathe some new life into it

be cool

[Silversinksam]

The company that makes the EMI shielded Monitor fan also sell something that I use as well, its a very cool item that effectivly keeps people(novices anyway) from starting your Pc

http://www.dansdata.com/images/jremote/jremotekit360.jpg

http://www.dansdata.com/images/jremote/antenna120.jpg

I thought it was a cool gadget for 19.99



http://www.dansdata.com/jremote.htm

[donny_paycheck]

OK the first candidate arrived today. 120x32mm, 120vac, 65CFM @ 36dba free air. I'm about to solder a cord on it and set it atop my monitor just to look for EMI from the 60hz motor windings distorting the picture. I got it from Newark Electronics (www.newark.com). Here it is:

*edit: the REAL specs - AC Tubeaxial Fan, 4715MS Series, Low-Noise Boxer™, 4.7 in sq x 1.5 inch Deep, 1 pound Weight, 88 CFM, 115 volt AC, 10.0 watt, 37 dBA, -20 deg C to +70 deg C Operating Temperature

[Jmichael484]

didn't even finish reading your article but i would really go against using the power from the monitor, just get a 12 or 9 v adapter and use the electricity from the wall.... well hell, just go to the overclockers accesorcies and then click on the monitor cooling article, thats what i made and it works great

[FrozenInHI]

seems you might find yourself inducing some noise into those heater circuits as well, the whole point of the mod is to prolong life of the monitor when the mod itself has a high potential to kill the monitor! You'd be much better off just making a long cable to power the fan from the pc power supply, make a passthrough molex connector and voila!

[BillA]

sure seems like doing it the hard way

following Sam's lead on monitor coolers (above),
I got 2 off eBay for $13.50 inc shipping
has fan, housing, hanger, cable, and pass-through

be cool

[Silversinksam]

Billa,

May I ask what type of fans you bought? and if they dont produce emi will you let us know as I only found 2 fans that worked. a 120 TA450dc thermal controled Nidec 120mm and the Justcooler premade monitor cooler/

Also Donny I did test 2 ac fans but not the model you bought and mine were no-go's so I'd like to hear if your successful.

[BillA]

the JustCooler premades

(they BETTER work !) <g>

be cool

[Jmichael484]

gosh, i just thought of emi and fans. Is there any way to tell if my current monitor cooler that i made from an old power supply fan is harmful?

[donny_paycheck]

Originally posted by Silversinksam
Billa,

May I ask what type of fans you bought? and if they dont produce emi will you let us know as I only found 2 fans that worked. a 120 TA450dc thermal controled Nidec 120mm and the Justcooler premade monitor cooler/

Also Donny I did test 2 ac fans but not the model you bought and mine were no-go's so I'd like to hear if your successful.

Well I got the NMB above and I have a Papst on the way and a brand new Rotron in the garage that I need to search for. I will test all three and grade them. If all else fails then I'll use a 120mm Panaflo H1A brushless DC run from a seperate power source either inside or outside the monitor, which I can guarantee will not make any noise in the circuits. As for inducing noise in the cathode heater, all it will 'see' is the 4 diodes of the bridge rectifier. There's no potential source of noise there, and any EMI generated by the AC fan (if it exists) won't make it back through the relay I'm planning on using. Here's a schematic of what I plan on doing:

[Silversinksam]

Donny,

If that fan doesnt work out for you I finally found where I got that particular Nidec thermally controled fan that apparently doesnt have an EMI issue

Bought it on Ebay from this seller (http://contact.ebay.com/aw-cgi/eBayISAPI.dll?ShowCoreAskSellerQuestion&requested=70712.3114@compuserve.com&iid=1316451153&frm=284)

He seems to have a never ending supply of these as I bought mine like 2 years ago (http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1316451153)

I run this exact fan @6 volts (naturally I have a fan guard as I kinda like my cat having all its paws :)

http://images.auctionworks.com/hi/5/4689/ta450dc.jpg

[Ozzman]

i can solve this whole prob easly buy the monitor from best buy and get a 3 year warrenty BAM anything goes wrong with monitor return it and get another or have them fix it... easy as that..

[BillA]

Ozzman

let's do a calc here

I have a dual screen setup with two 21 in. Hitachi monitors

so 2 x $1100 = $2200, divided by 3 = $733 would be the annual cost with your 3 yr "ignore it" program

if the $13.50 that I just spent on 2 JustCoolers adds even 1 yr, I just "made" $733

you getting the idea ?

be cool

[donny_paycheck]

Originally posted by Silversinksam
Donny,

If that fan doesnt work out for you I finally found where I got that particular Nidec thermally controled fan that apparently doesnt have an EMI issue

Bought it on Ebay from this seller (http://contact.ebay.com/aw-cgi/eBayISAPI.dll?ShowCoreAskSellerQuestion&requested=70712.3114@compuserve.com&iid=1316451153&frm=284)

He seems to have a never ending supply of these as I bought mine like 2 years ago (http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1316451153)

I run this exact fan @6 volts (naturally I have a fan guard as I kinda like my cat having all its paws :)

I checked this out. It looks good...especially the fact that it's thermally controlled. I've got a fan guard standing by, so I will definitely turn to this one if my fan choices do not yield results.

[Silversinksam]

Originally posted by BillA
Ozzman

let's do a calc here

I have a dual screen setup with two 21 in. Hitachi monitors

so 2 x $1100 = $2200, divided by 3 = $733 would be the annual cost with your 3 yr "ignore it" program

if the $13.50 that I just spent on 2 JustCoolers adds even 1 yr, I just "made" $733

you getting the idea ?

be cool


What else can I add to Billa's comments besides an AMEN brother


;)


ps..Ozzman, What happens if the user has a monitor out of warranty? You think the monitor cooler makes sense then?

The Monitor cooler is silent and is just there like a vitamin for your Monitor to keep it healthy. After all, Its the most expensive piece of your Pc
:eek:

[donny_paycheck]

Originally posted by Silversinksam
ps..Ozzman, What happens if the user has a monitor out of warranty? You think the monitor cooler makes sense then?

Actually I got my trinitron 21" from eBay...no warranty either, probably why I'm screwing around inside it in the first place too.:D

*edit: I got the Rotron from the garage today. In addition to the NMB 120vac posted before, these are the other 2 candidates; a 120x32mm 120vac EG&G Rotron Whisper-XL 50.5CFM@31.2dBa and a 120x32mm 12vdc brushless Panaflo H1A 103CFM@41.5dBa. The brushless Panaflo will be my last resort. I will almost definitely run that from a seperate 12vdc adapter if I need to use it.

[donny_paycheck]

...and here they are:

*edit - The Panaflo is 103CFM@41.5dBa, the NMB 88CFM@37dBa and the Rotron is 50.5CFM@32dBa...although I've already put their values here, I wanted to post them again in a consolidated fashion for comparison.

[Silversinksam]

Donny,

Have you tested them for EMI yet? Just place them one by one on top of your monitor powered up by a cheap ac/dc converter.

Scotch Double sided mounting tape is what i used to affix them and The way I wired it up is I took a photocell and relayed it to the monitor fan attached to the Ac/dc switch/ When the system powers up the fan turns on automaticly.




Since your the mad scientist I thought you could do something similiar.

[mx]

Originally posted by donny_paycheck


Yeah it does, but I see those stupid snap-on monitor fans and think of a better way. I am bored, this is my hobby, so I'm going to experiment.

Your brave Donny.........I say go for it!..........but before you crack it open make an offering to the SILICON GODS!:cool:

[donny_paycheck]

Originally posted by Silversinksam
Have you tested them for EMI yet? Just place them one by one on top of your monitor powered up by a cheap ac/dc converter.


Negative ghostrider, but I'll get to it this week and post results when I do! I'm hoping for the best with these AC fan motors....the AC fans are much better quality than the Panaflo model and they run quieter too.

[RangerJoe]

Originally posted by Silversinksam
The company that makes the EMI shielded Monitor fan also sell something that I use as well, its a very cool item that effectivly keeps people(novices anyway) from starting your Pc

http://www.dansdata.com/images/jremote/jremotekit360.jpg

http://www.dansdata.com/images/jremote/antenna120.jpg

I thought it was a cool gadget for 19.99



http://www.dansdata.com/jremote.htm

hey dude, i cant find where to buy this thing, i looked all over the just cooler webiste, but no luck...please help

[KLowD9x]

Originally posted by donny_paycheck
...and here they are:

*edit - The Panaflo is 103CFM@41.5dBa, the NMB 88CFM@37dBa and the Rotron is 50.5CFM@32dBa...although I've already put their values here, I wanted to post them again in a consolidated fashion for comparison.

Feathered Edge Technology, eh? That just makes it look like more of a finger shredder.

[Silversinksam]

Originally posted by RangerJoe


hey dude, i cant find where to buy this thing, i looked all over the just cooler webiste, but no luck...please help


Believe it or not they are extremely hard to find on the retail market, but if you contact this guy he will sell you one for $19.99, I got mine from him and he's a very honest vendor and ships fast
If memory serves me correct hes one of the few resellers that actually has this gadget.


photoepix@aol.com

[touser]

Originally posted by RangerJoe


hey dude, i cant find where to buy this thing, i looked all over the just cooler webiste, but no luck...please help i do not know if this helps you or not, but i saw this exact same thing at my local Fry's electronics, so if you have one near you check it out!

[donny_paycheck]

Alright, I have tested both the Rotron and NMB AC fans by placing them atop my monitor outside the case while running...neither of them instigate any interference. There isn't any EMI shielding screen inside the monitor either, so I am really doubtful that placing them 1 inch closer to the CRT yoke will affect the deflection coils at all and make the screen jitter. Next step is to get my 4 11/16" hole saw from home depot and punch the hole in the top of the case. Then I'll test them internally. If all is well then I'll use the Rotron model as it is very quiet...barely a whisper right next to my ear and still 50CFM of ventilation; more than enough for the confines of my monitor.

As for powering them I have been doing some research. The filament voltage may already be DC and not need my little rectification circuit. This would be awesome because I'd only use the relay. If not then I'll implement the rectifier and filter capacitor and run the relay coil through them. My second and admittedly easier option is to just mount a small toggle switch through the case on the side somewhere and have that feed the fan directly from the IEC power in receptacle terminals. I think the relay will be really slick if I can do it though, so I'm going to try.

More to follow...

[Silversinksam]

If yours comes out good don't think for 2 seconds I won't be embedding my fan into my monitor too :p

If I wasn't making some silversinks for a bro tomorrow, I'd be at the Home Dept.----- Cancel that real men use Dremels for everything and I got one of those. :beer:



ps, Donny don;t you think 50cfm is pushing the envelope? My 120 Nidec is probably moving 25cfm at best at 6 volts and thats plenty of exhaust.

[donny_paycheck]

FINALLY! At long last the monitor cooling mod is completed. It works great! Right now I am testing the temps with and without the fan running to see what gains I made. The next several posts will be pictures of it....here we go!

First of all, this is my monitor before the project; a Sony Trinitron 21" made for Dell:

[donny_paycheck]

This is the immediate inside of the monitor. Everything is housed in light-gauge aluminum EMI shields thankfully, which alleviates the worry of causing EMI in the monitor circuitry.

[donny_paycheck]

This is what is behind the aftermost EMI shield - the backplane that the CRT plugs into.

[donny_paycheck]

I was happy to be able to locate the pins for the cathode heater quite easily (red) as "HEATER +" was marked on one of the power pins where the power came onto the board. I took a multimeter and set it to measure AC volts 0-20 and measured the heater pin's voltage in reference to the ground pin next to it on the CRT socket (black). I didn't get any indication so I tried DC volts and whammo! 6.3 volts exactly. The good part of this was that I did not need to build my little rectifier circuit that I thought I'd need to. Instead I could activate the relay solenoid directly from the heater circuit.

[donny_paycheck]

With a source to actuate the relay coil identified, the next thing I needed was a 120 volt AC source to drive the motor of the fan. The only AC power in this monitor is inside the low-voltage power supply right behind the IEC power-in connector. The 120vac comes into the monitor and heads directly for the LVPS via a 6-inch set of wires. I wanted to power the fan from a source internal to the monitor because it'd be much neater...no cords to run outside of the monitor. Here's a picture of the 120vac in leads (red):

[donny_paycheck]

Here's the LVPS minus the shields and tilted out of the case structure:

[donny_paycheck]

Here's the back of the LVPS circuit board. The red arrow points to the pins of the 120vac in connector. I soldered two black wires onto these pins to run to the relay and fan:

[donny_paycheck]

The red arrows point to both the 120vac power leads and the 6.3vdc heater circuit leads for the relay:

[donny_paycheck]

Here is the relay I used, wired and mounted on the outside of the EMI shielding (now re-installed).

RED - Relay (12vdc coil, 120vac 5A contacts)
BLUE - 120vac from LVPS board
GREEN - 6.3vdc from heater pins on CRT backplane
YELLOW - switched 120vac out to fan motor

[donny_paycheck]

Here is the Whisper XL 120vac fan that I posted a pic of earlier in the thread, a 120mm grill and the pigtail for connecting the .120" blade terminals of the fan:

[Morbid]

Originally posted by Silversinksam


The Monitor cooler is silent and is just there like a vitamin for your Monitor to keep it healthy. After all, Its the most expensive piece of your Pc
:eek:


Actually, my video card was the most expensive part of my PC :eek:

I have a Samsung Syncmaster 955DF (who doesn't have this? hehe) and a 3D Prophet III (GeForce3)

Monitor was about $320
Prophet was about $410

But I agree... donny's idea is good and it's alot cheaper route for something that makes more since.

[donny_paycheck]

I drilled a hole in the plastic shell using a Milwaukee 4 1/2" hole saw (perfect hole size for the venturi of a 120mm fan) and drilled 4 holes for the bolts (2 1/2"x6/32 thread). Then I bored out a large hole with my dremel for the molded connector on the end of the pigtail because it was already connected inside the monitor and I'd need to pass it through the case in order to get it to the fan, which was mounted on the outside of the case. I would have liked to have mounted it internally, but the EMI shields didn't leave enough clearance between themselves and the case.

This is a view of the fan mounted on the shell from inside of the shell. I took it right before I put the shell back on.

[donny_paycheck]

Here it is, all done! (edit-elapsed time, 2 hours) The temps are as follows (I've been taking them while typing this):

Ambient temp: 72.8F
Without fan running, on for 1 hour: 104.2F
With fan running for 5 minutes after the 1-hour warm up: 74.2F

I took the temps with a cheesy $10 indoor/outdoor thermometer that I got from Radio Shack. The fan is very quiet, inaudible above my computer itself (thanks, Delta) and puts out a gentle breeze of lukewarm air. No EMI/waviness presents itself. I could try the more powerful NMB fan from earlier in this thread but the difference in temperature is great and I don't feel like listening to another fan. Post your questions/comments please! I'll try to answer them or make an excuse for myself if necessary.:p

[Silversinksam]

Donny, THAT'S SWEET!

We have been scoffed at by the skeptics but the proof is in the pudding with a 30*+ redection in temps!

I get about 20* reduction as my fan is just stuck on the Top with double-sided tape.


You are the man Donny, but there is a rumor that THIS MAN (http://photos.yahoo.com/bc/rylandpage/vwp?.dir=/Pictures+from+deployment&.src=ph&.dnm=Fish+guts!.jpg&.view=t&.done=http%3a//photos.yahoo.com/bc/rylandpage/lst%3f%26.dir=/Pictures%2bfrom%2bdeployment%26.src=ph%26.view=t) taught you all you know with electronics:)

Found that photo in your photo album (http://photos.yahoo.com/bc/rylandpage/lst?.dir=/Pictures+from+deployment&.src=ph&.order=&.view=t&.done=http%3a//photos.yahoo.com/bc/rylandpage/lst%3f.dir=/Pictures%2bfrom%2bdeployment%26.src=ph%26.view=t) :)


:p

[Athlonman]

I can see keeping your monitor cool is a good idea

[GoldenTiger]

Cooling your monitor is a *BAD* idea. They make their picture by heating tubes to produce colors. Cooling them strains the monitor and damages it, while reducing picture quality.

[donny_paycheck]

LOL thanks Sam...I was trying to keep that guy a secret but the cat's outta the bag now, I guess. He only cuts fish by day...by night he copies PS2 games and sells them in the streetfront shops of Hong Kong. :p

GoldenTiger - While the CRT uses a heated cathode to emit electrons, it is the only component that requires heating. All other electronics inside the monitor should be treated like normal components when it comes to thermal management; cooler is better. A directly-heated cathode ray emitter in a vacuum will not be degraded in it's operation by the components outside of it's tube operating at a lower temperature! Furthermore, the circuitry that coordinates the horizontal and vertical sync signals as well as the color seperation between the color guns can be stressed by high temperatures. Monitors with chronic heat dissipation can actually exhibit color clarity degradation and sync problems (like flickering and stuff) when they get too hot.

[GoldenTiger]

Donny: That's true, but if your monitor isn't overheating already it usually would do more harm than good as you'd risk cooling it too much. I wasn't knocking the idea of monitor cooling, but rather (phrased fairly badly) trying to just state what I just said :).