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G70 and resistor on fan...can it be done?

 
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benareeno



Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada

Posted: Thu Jun 17, 2010 7:51 pm    Post subject: G70 and resistor on fan...can it be done?

Seeing as this thing is worthless...and relatively loud. I want to tame the fan speed a bit. I tried a resistor and the projector errored with error code 27. Perhaps the resistor is too strong?

Instead of paying 100 to buy slower fans...I figured why not just put a resistor in there?

I removed the metal grills...didn't really have much of an effect at all...so I will slow the fans, if I can.

I figured out that you could simply ground the sensor wire on an NEC and it would trick the projector into running at lower fan speed. Anyone know if I can simply ground that sensor wire on the G70 as well?

THanks,

Ben
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AFryia



Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q

Posted: Fri Jun 18, 2010 1:20 am    Post subject:

I believe there is a pot on the board that powers the fans.

Hush box is the only way to silence the beast

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benareeno



Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada

Posted: Fri Jun 18, 2010 4:31 am    Post subject:

No...it's not the only way. I will silence it a bit and shorten its life...but I don't really care because it's worthless now anyhow.
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Spanky Ham



Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central

Posted: Fri Jun 18, 2010 4:39 am    Post subject:

Why is it worthless? Do you mean it doesn't have any resale value? If so, then that is quite different than worthless.
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benareeno



Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada

Posted: Fri Jun 18, 2010 5:14 am    Post subject:

it's worthless unless it's quiet...I'll tell you that much.
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Spanky Ham



Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central

Posted: Fri Jun 18, 2010 7:56 pm    Post subject:

Ummm ok. Haven't you owned more than one CRT?


You could add some fans and turn them all down. Another option is to go the water cooling route like with computers.
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benareeno



Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada

Posted: Sun Jun 20, 2010 10:24 am    Post subject:

umm...yah, i have. I have owned pretty much all of them.

I just want to slow the fans a bit...no other discussion required.
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Joust



Joined: 05 May 2006
Posts: 2429
Location: Almonte, Ontario, Canada

TV/Projector: Marquee 8501LC

Posted: Sun Jun 20, 2010 2:57 pm    Post subject:

you could use a resistive load to fool the set into thinking the fan is drawing the correct load. that is unless its speed its detecting.
then make an adjustable voltage regulator to drive the fan at a lower voltage. if it has a fan speed wire, you could still run that back to the set as well. an LM317 should do the trick.
just a thought.
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macgyver655



Joined: 22 Aug 2007
Posts: 8508


Posted: Sun Jun 20, 2010 3:19 pm    Post subject:

benareeno wrote:
umm...yah, i have. I have owned pretty much all of them.

I just want to slow the fans a bit...no other discussion required.


Cut a blade or 2 off each fan or trim the blades thinner. That should quiet it down......
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Kiev Savoie



Joined: 25 Oct 2007
Posts: 432


Posted: Sun Jun 20, 2010 9:27 pm    Post subject:

I've never heard of water cooling for CRT before. I'd like to check that out. Do you have a link?
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Spanky Ham



Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central

Posted: Mon Jun 21, 2010 12:50 am    Post subject:

Kiev Savoie wrote:
I've never heard of water cooling for CRT before. I'd like to check that out. Do you have a link?


No, I have thought that might be a good way to cool some of the hottest chips inside a CRT. I am not sure what the hot zones in a G70 are. I first thought about it for a PG. In that pj, I think it could work well.
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benareeno



Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada

Posted: Mon Jun 21, 2010 8:05 pm    Post subject:

I think it's high time that someone actually tried water cooling...and I agree, a PG is an excellent candidate.

I'm interested in this trim a fan blade method...I love simplicity!
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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Mon Jun 21, 2010 8:51 pm    Post subject:

Get one of these

http://cgi.ebay.com/Power-Supply-Board-AC-DC-in-DC-out-Based-on-LM317-IC_W0QQitemZ250499486450QQcategoryZ117000QQcmdZViewItemQQ_trksidZp4340.m8QQ_trkparmsZalgo%3DMW%26its%3DC%26itu%3DUCC%26otn%3D5%26ps%3D63%26clkid%3D7654890389679692225#ht_8242wt_972

Then you can see where the right speed you want is.

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benareeno



Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada

Posted: Mon Jun 21, 2010 10:25 pm    Post subject:

trimming fan blades appears to be a bad idea...it throws the balance of the fan off and now the fan is noisy! THat is funny!!

Anyone have a spare G70 fan?
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benareeno



Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada

Posted: Mon Jun 21, 2010 10:56 pm    Post subject:

and the resistor would have worked...I didn't have the cap on the polarity switch...thus the error 27. I have really grown to hate the G70 chassis...it won't turn on when the polarity cover is open? I mean really....
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macgyver655



Joined: 22 Aug 2007
Posts: 8508


Posted: Tue Jun 22, 2010 2:28 am    Post subject:

I can't even comment..... >shaking head<
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