Chuck Williams Fan Mod, WOW!! - Page 4 - AVS Forum
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post #91 of 231 Old 12-21-2001, 02:53 PM
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I'm using another variation of the mod on my 1271. Something about disabling the fan protect just bugs me. I used a DPDT relay and {2} transistor regulators instead of just one. That way I can give the power supply fans 8v to satisfy the protect circuit and the rest of the fans can ran at the more desirable lower speed.

It was either that or I was going to add a mechanical thermal switch {like used in dryers, you can get them in temp ranges from 120 deg and up} to switch the fans to full speed "if" there was ever a buildup of heat. Once temps were back to normal the switch gives control back to the mod circuit. It would be a little extra piece of mind.


Dave
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post #92 of 231 Old 12-29-2001, 02:08 PM
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Ok I finally installed Chucks fan mod to my NEC 10PG.
I find the 10PG to be on the quieter side to begin with. Maybe its because of the larger chassie and the resonating noise is not as high pitch.

With the Mod I can barely hear the unit. This is the best ever.
You need to be right on top of the machine. It took me a little over an hour to complete the mod. I am lucky because the projector is currently table mount.

Anyway, Chuck thanks for this great circuit. I hope your working on your next tweak, we are ready!
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post #93 of 231 Old 12-29-2001, 03:56 PM
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Hey . . . I've been a fan of Chuck Williams for some time now.

Looks like there's something else to do next time I lure you out here, Chuck.

Have a great new year.

Nick :cool:
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post #94 of 231 Old 01-15-2002, 07:29 AM
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Hello,

I would know if someone has improved the fan mod?

- new ideas?
- any pictures of the mod?
- any temp data after mod?

thank you very much!

regards

Bruno
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post #95 of 231 Old 01-15-2002, 07:55 AM
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Bruno,

I've finally settled on a design that doesn't use a relay. This was no big deal when used with an NEC, but since the Sonys use a negative voltage for the fan supply, I changed the circuit by adding an opto isolator in series with the Zener diode.

Now that I'm happy with the circuit, I'll be getting circuit boards printed.

Chuck

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post #96 of 231 Old 01-15-2002, 07:57 AM
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Is the fan mod for the NEC XG135 now perfected? Thought it was still sort of beta.

Nick :cool:
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post #97 of 231 Old 01-15-2002, 07:58 AM
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Bruno,

I have a Pulse Width Modulation Fan control chip sample I'm waiting for. When I get it, I'm going to try some things out with that.

In the meantime, I'm intending to design an LM317 adjustable voltage regulator circuit with a capacitor to initially set the voltage to about 12 volts and then drop it down to some amount like 7 volts after a couple of seconds. This should be a pretty simple circuit for others to easily copy.
It would not affect the speed sensor output of the fans and should be able to go inline with the connector.

Perhaps I'm retracing old ground (pun not intended) that others have already tried, if so let me know.

Regards,

Ira

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post #98 of 231 Old 01-15-2002, 09:53 AM
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Chuck,

I have been running your "original" circuit (with relay) but increased the zener value first to 6.8V and then finally 7.5V, on a 1272. I have logged ~30 hrs. in this configuration with no ill effects and with what I percieve as a better than 75% noise reduction. What concerns me however is the need to defeat the fan protection circuit in order to run the fans at this voltage.

Any thoughts on how it might be possible to have some sort of fan failure protection and still run this mod?

Thanks for sharing your ideas.

Doug
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post #99 of 231 Old 01-15-2002, 11:02 AM
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OK here's the deal...I have a 1252 ceiling mounted and would LOVE to do this mod. However...I don't have the experience to do this alone. If anyone lives near Minneapolis, I would be willing to pay someone to do this for me...I figure I would spend some money on a hush box anyway, and would rather go this route. Any ideas would be appreciated.

Thanks,

EJ

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post #100 of 231 Old 01-15-2002, 11:33 AM
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Chuck,
Can I get the latest schematics for the 1272 Mod? I've got mine up and running, but if there are concerns about the safety of either the circuit or the projector I'd like to make sure I'm as safe as possible :)

Depending on the changes to the new circuit I may need to rebuild it from scratch. Will you be selling the circuit boards and if so, how much?

Thanks for the excellent circuit!!

Dave

P.S. Does anyone know how to get to the fan above the center tube on the projector (mine is ceiling mounted)? It appears to be the biggest offender by far, but I am unsure how to get to the fan to apply the circuit to it. Is there a way to apply this circuit to it without having to take the tube out? Thanks!
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post #101 of 231 Old 01-15-2002, 03:31 PM
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Dave - Are you talking about the power supply fans? If so, you get to them by removing the power supply, not the tube. You're right, they seem to be the worst offenders.

It's a challenge while ceiling mounted.

Randy
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post #102 of 231 Old 01-15-2002, 04:00 PM
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Nick,

The circuit works for the XG, I've just never installed it in one that included the power supply fans. But it works great for eight of the eleven fans in an XG, and if yoou want to pull the power supply, adding the power supply fans should be no problem.

Doug,

The only way to not disable the fna sense for the power supply fans is to change some component values in the fan sensor circuit for the power supply, or run the fans at a higher voltage, and they get noisy really fast as you raise the voltage.

David,

The new circuit isn't "safer," it's just more elegant. I haven't scanned in the new circuit yet, but will soon (I'm really swamped lately!).

Chuck

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post #103 of 231 Old 01-15-2002, 04:11 PM
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Chuck:

I've just signed on for the Chuck Williams Tour of Ohio in April. I hope that, in addition to general tweaking, you can install the fan mod. You know my setup, so let me know if that's agreeable to you.

Thanks,

Nick :cool:
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post #104 of 231 Old 01-15-2002, 06:06 PM
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Chuck,
Well more elegant is cool too :) I am eager to see it.

Randy,
Do you know where I can find info on how to get to the fan in the power supply?

Dave
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post #105 of 231 Old 01-15-2002, 08:02 PM
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Gentlemen,

Once the XG135LC fan mod is complete and tested someone please forward the details.

Thanks, John

Building our dream theater one component at a time.. Thanks AVS for years of great advice and support!

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post #106 of 231 Old 01-16-2002, 08:53 AM
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Dave - Check out this link to the manual that has a section on removing the power supply.

Good luck.

Randy
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post #107 of 231 Old 01-16-2002, 08:56 PM
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Thanks Randy!! I'll look over the document this weekend.

The people on this forum are great!! :D

Dave
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post #108 of 231 Old 01-18-2002, 08:10 AM
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I hooked the circuit to the power supply fans last night and finally got the darn thing back into the projector and turned it on and it shut off! It breifly flashed up the fan problem error code. I'm not sure what the problem is.

The circuit worked for the other fans, why not these?

Is there something special that needs to be done to these to get it to work?

I remember reading somewhere in the forums that if you tie the yellow wire to the black wire that the protection circuit is bypassed. Is this true? Would this take care of my problem?

I am desperate at this point. I have company coming this weekend and I need to get this thing back up and running again.

Thanks!

Dave

P.S. I used the 9.1 Zener as was suggested in a previous post, so the voltage is dropped to around -8V. I also used the 46K resistor on the 555 so that there is approximately a 4 second delay before the voltage is lowered.
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post #109 of 231 Old 01-18-2002, 03:52 PM
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Bump :)
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post #110 of 231 Old 01-18-2002, 04:28 PM
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You'll be treating symptoms by defeating the protection circuit and may not solve the root problem. Verify that you're supplying voltage from the fan-mod board to the wires going to all fans. Check them individually, you may have loosened another connection while connecting the power supply fans.

For my install, all fans connected the same with no issues.

Randy
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post #111 of 231 Old 01-18-2002, 04:41 PM
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Randy,
Thanks again for the quick reply. I'll dig out the volt meter and test the wires. Its just such a pain. My projector is ceiling mounted and since the power supply can't be taken down completely without disconnecting all of the connectors to the board its a REAL pain working on it on a ladder.

If it turns out that the fans are getting their -15v do you have any other suggestions? If options are exhausted, can I tie the yellow and black wires going to the board together to (temporarily) circumvent the protection, at least for this weekend?

Thanks again.

Dave
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post #112 of 231 Old 01-18-2002, 06:35 PM
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I believe sending the fan sense lead to ground will fool the protection circuit (can someone verify this?).

1/20/02 Edit - You must tie the yellow and black wires together to defeat the protection circuit.

If you're supplying -8v to the fans, you shouldn't get a fan stop error unless there's a legitimate problem.

Consider the risks of bypassing the protect circuit, such as running your projector with one or more of the fans inoperative. Could lead to a bad weekend. :(

I slid my power supply out without completely detaching it to double-check my wiring for this same project. Get someone to stand on a ladder next to you and hold the power supply (unplug AC power!) long enough for you to verify continuity from your mod circuit board to fan. If you have continuity from board to fan, I guess it's possible that you have a rogue fan that won't run at -8v?

It is error code 01 right? Don't forget the LED's are upside down, so it'll look like a 10.

Good luck.

Randy
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post #113 of 231 Old 01-18-2002, 09:28 PM
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Randy,
Once again thank you! I didn't see your last post until after messing with the projector. I decided to check the voltages to make sure that one of the connections was not loose. As you predicted it appears that one of them was intermittent. I recrimped my connectors and am listening to the "computer level" noise of my projector as I type this.

Thanks again to Randy, Chuck and you others in this thread for helping me get my projector to a much quieter state. Now all I have to do is roll this Dynamat Extreme on the inside of the cover and I'll be completely happy with my projectors sound levels (or lack thereof :)).

Dave
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post #114 of 231 Old 01-18-2002, 09:32 PM
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Dave,

I had similar trouble with the power supply fans causing an error code. The fans would run but the protection circuit was more sensitive for them it seems.

To get the projector running again quickly, you could disconnect the wires going to the PS fans from the mod circuit and connect them to the same -15V supply you have going into the mod board. Things will be louder but you'll still have a PJ for the guests.

Jerry
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post #115 of 231 Old 01-19-2002, 02:38 AM
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Hello!

GREAT POST !!!!!!!!

Randy,

I believe sending the fan sense lead to ground will fool the protection circuit (can someone verify this?)

Yes it's right! you can fool protection by this way, I did it with 4 fans on my 1270 and no problem, except no protection...:D

PLEASE SOME PICTURES of the mod !!!!!!!!!!!!!!!!

thank you very much!

regards

Bruno Lovisi
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no, I'm kidding
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post #116 of 231 Old 01-19-2002, 01:23 PM
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Quote:
Originally posted by Bruno Lovisi


I believe sending the fan sense lead to ground will fool the protection circuit (can someone verify this?)

Yes it's right! you can fool protection by this way, I did it with 4 fans on my 1270 and no problem, except no protection...:D
Are you sure? I think you'd have to tie the yellow wire (fan sense) from the connector to the black wire (fan supply, which is a negative voltage) from the connector, not tie the yellow wire to ground. Suppose, in an unmodified circuit, the fan stops running. That would be the same as the yellow wire going to ground, causing the protect circuit to engage.

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post #117 of 231 Old 01-19-2002, 05:05 PM
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Hello Chuck,


[q]I think you'd have to tie the yellow wire (fan sense) from the connector to the black wire[/q]

Sorry, you're right! I've answered too quickly

regards

Bruno Lovisi
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post #118 of 231 Old 01-20-2002, 08:17 AM
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Is someone creating a brief FAQ on the NEC XG mod? If so can someone please send me a copy with proposed schematic/parts list attached?

If not, can someone point me to the appropriate thread where I can find the details?

I sure would like to quiet my 135.

Question, after the modification has been installed, if a modified fan dies, will the sense circuit detect the failed fan?

Thanks, John

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post #119 of 231 Old 02-02-2002, 07:08 AM
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I have a sony vph-1271QM, but....
I was trying different zeners with the first power supply fan, a smile on my face, until a little lapse of precaution. There was a little spark to the ground and now neither of PS fans start and I get error code 1. Guess something went kaput.
Wires from both fans go to this little circuit board marked SOPS-1001M2. Now I crave for the schematics so my dad (skilled more like an electrician) can help me to locate the broken part and change it.

Any help will be highly valued.

Jari
oohblue@hotmail.com
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post #120 of 231 Old 02-02-2002, 02:56 PM
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Jari,

If it's only the power supply fans that do not start up, you blew PS251 on the M2 board in the power supply. This little gizmo is just a fuse type device and looks like a signal transistor with only two leads. You can replace it with a 1.5 amp micro fuse.

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