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post #1 of 113 Old 01-16-2007, 11:46 AM - Thread Starter
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Hello to all G70 owners !

Since I've been asked for information on silencing the Sony G70 projector and because I made it again for my brother's G70 unit, I've decided to post this step by step procedure. This mod will cut the noise by approximately 8 dBA (nearly half the noise level).

The G70 unit hold three 120x120x38mm Japan Servo CNDC12B4 (40dBA noise each !) that draw ~85CFM each. Then, I would assume that changing these fans to SilenX IXP-76-14 (72 CFM) is the best replacement part versus the original 85CFM. Note that there is also the 90CFM version (IXP-76-18) from SilenX that could be use for this fans replacement but the noise is rized from 14dBA to 18dBA each.

Here is the complete SilenX IXP-76-14 specifications

http://www.silenx.com/ixtremaprofans.asp?sku=ixp-76-14
SKU: IXP-76-14
Rated dBA: 14 dbA
Dimensions:120x120x38mm
RPM: 1200 rpm
airflow: 72 CFM
nominal Voltage: 12V
Current Draw: 0,20A
Power Consumption: 2.40W
Bearings: Hybrid Immersion

1°]Remove the G70 front and rear top ABS covers. Unscrew the center aluminium cover screw and open it toward the front. Remove the fans wiring assembly from the fans plastic housing tabs :


Finally unscrew the first fan plastic holder (two black top screws), disconnect the fan connector and remove the fan assembly out of the unit.


2°]Disassemble the original Sony fan from its housing by removing its four rubber spacers relief from the fan housing :


Then remove the four SilenX rubber spacers from the fan itself :


3°]Order one Samtec PCB header from RS-components/Radiospares (order code 277 9742 - see the Samtec relevant DS page in here). Update it to retreive three 3 pins headers like this :


4°]Place the four rubber spacers inside the SilenX new fan :


5°]Before placing the new fan inside the sony plastic housing, place the fan's wires like this:


Next post to follow ...

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post #2 of 113 Old 01-16-2007, 11:47 AM - Thread Starter
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6°]Place the new SilenX fan with its four rubber spacers inside the Sony plastic housing :

Take car that the fan's connector must been outputed on the right side !

7°]At this stage, update the SilenX white connector housing wiring to fit Sony wiring by swapping the +12V and SENSE wires:


8°]Place the three pins header inside the SilenX connector housing:


9°]Place the fan assembly back inside the G70 unit and Connect it to the Sony internal connector this way (you must check that wires colors vs SilenX connector housing is OK):


10°]Wrap 7cm of electrician scotch tape all around the connectors assembly:


11°]Place the fan+housing assembly back in place (check that lower tabs fit their slots) and place back the two black screws to secure it :


12°]Update the rest of the fans (2) exactly like the first one:



All noise measurements were made before and after the fan replacement at a 1m distance from the back of the G70 with it's outer plastic shell removed (ie: worst case scenario).

Here is the results :

- Noise floor : 34dBA
- With original Sony fans: 47.4dBA
- With new SilenX fans: 39.4dBA

Overall noise Gain : 8dBA not that bad

That's it! The fans should all run fine when the unit is powered up. The big difference being how G70 is now even quieter than before. Enjoy!

John

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post #3 of 113 Old 01-16-2007, 12:48 PM
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Fantastic detail, John. Thanks.

How long will these replacement fans last in comparison with the originals? My experience with computer fans is that they're great when brand new but seize up very soon afterwards.

Also in previous posts you suggest cutting away the perforated metal behind the fans. Do you still recommend this and if so how many more DB can be gained?
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post #4 of 113 Old 01-16-2007, 02:47 PM
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Quote:


Also in previous posts you suggest cutting away the perforated metal behind the fans. Do you still recommend this and if so how many more DB can be gained?

I would be interested in this too, specifically a PJ with cut grilles and new fans.
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post #5 of 113 Old 01-16-2007, 03:31 PM
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Excellent write-up.. Thanks
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post #6 of 113 Old 01-16-2007, 04:02 PM
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John,

Tres' Bien

How much run time does your brother's G70 with the 72CFM fans have?

AJF

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post #7 of 113 Old 01-17-2007, 01:05 AM - Thread Starter
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Quote:
Originally Posted by Axatax View Post

I would be interested in this too, specifically a PJ with cut grilles and new fans.

Hi Jeff
Yes, for this unit, I didn't cut the perforated metal grid behind the B/BA board :

In fact, I'm not sure that this 'long' operation makes significant noise reduction since it's only 1/3 of the fans paths

Quote:
Originally Posted by AFryia View Post

How much run time does your brother's G70 with the 72CFM fans have

From now only one hour or so but I did it also on another G70 unit that I've sold more than a year ago and the unit is still working like a charm

Genral comment : I made fans replacement on G90 units too and this one makes better noise reduction (8dBA) probably because the original G70's fans are VERY loud ! Then I would say that doing this is a must on G70 units
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post #8 of 113 Old 01-17-2007, 03:45 AM
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I've followed John's process (same fans albeit I cut the silenx connector and resoldered the wires direct rather than applying the header process that John has progressed to) and also removed the grill apertures - sound reduction was significant in my opinion and well worth the effort. I no longer have to apologise for the fan noise to visitors! I have some convergence drift (I note the recent thread on this topic) but do not think it is because of the fan swap.
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post #9 of 113 Old 01-17-2007, 07:56 AM
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Hi John,

I'm assuming that you'd like for me to post this on Curt's site as an advanced procedure as well right?

I'm going to give this thread a few days in case you add any more photos or do any other changes, and then I'll snag it.

Kal
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post #10 of 113 Old 01-17-2007, 08:03 AM
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Good work John! I saved this page for future reference.

Phil Smith
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post #11 of 113 Old 01-17-2007, 08:39 AM - Thread Starter
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Quote:
Originally Posted by kal View Post

I'm assuming that you'd like for me to post this on Curt's site as an advanced procedure as well right?
I'm going to give this thread a few days in case you add any more photos or do any other changes, and then I'll snag it.

Yes kal, no problem

Thanks Phil

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post #12 of 113 Old 01-24-2007, 07:44 AM
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Quote:
Originally Posted by stephenbr View Post

I've followed John's process (same fans albeit I cut the silenx connector and resoldered the wires direct rather than applying the header process that John has progressed to) and also removed the grill apertures - sound reduction was significant in my opinion and well worth the effort. I no longer have to apologise for the fan noise to visitors! I have some convergence drift (I note the recent thread on this topic) but do not think it is because of the fan swap.


Was the G70 drifting before the swap?

JCP
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post #13 of 113 Old 01-25-2007, 11:17 AM
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Fantastic Job

Is it possible to change the fans whitout taking the G 70 from the ceiling ?
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post #14 of 113 Old 01-25-2007, 11:27 PM
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I hadn't installed my G70 prior to the fan swap so I cannot comment on whether it was drifting previously. The other night I re-converged all my sources and the drift has been virtually eliminated - I just occassionally check it after the pj has been on for about 1/2 hour and sometimes it needs slight tweak to the centering of the red and blue tubes.
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post #15 of 113 Old 01-25-2007, 11:38 PM - Thread Starter
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Quote:
Originally Posted by artoj View Post

Fantastic Job
Is it possible to change the fans whitout taking the G 70 from the ceiling ?

Yes, I think so since most of the handy work is donne on the fans ABS enclosure taken out of the unit John

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post #16 of 113 Old 01-26-2007, 03:52 AM
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Quote:
Originally Posted by JohnHWman View Post

Yes, I think so since most of the handy work is donne on the fans ABS enclosure taken out of the unit John

Thank´s for info

Next I need to find those new fans and decide if I will also remove the grill apertures, which may be a little touhger job to do and for that I think it wise to take the G 70 from the ceiling anyway...
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post #17 of 113 Old 01-26-2007, 05:13 AM
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I might try this with the 90 cfm fans, as it is a rule that keeping things cooler makes them last longer, and I think the 4dba difference in noise between the 2 fans is still low, but going up 5cfm should be a safer move than dropping 13cfm. Now I just have to find a place to buy them. Thanks for the info.

JCP
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post #18 of 113 Old 01-26-2007, 05:29 AM - Thread Starter
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Yeah, why not JCP, I mentionned this alternative part in the thread.

John

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post #19 of 113 Old 01-26-2007, 08:00 AM
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John,

Don't know if you noticed my earlier question: How long will these replacement fans last in comparison with the originals? My experience with computer fans is that they're great when brand new but seize up very soon afterwards.

Fantastic post BTW. Thanks again.
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post #20 of 113 Old 01-26-2007, 07:21 PM
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This company has a place up in NY state. And you can get in contact with them there from their site. It seems they are very proud of their fans by the way they talk about them on the site. I will ask them what they think the life of them is in hours, and what their guarantee is.

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post #21 of 113 Old 01-27-2007, 12:29 AM - Thread Starter
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Quote:
Originally Posted by barcoed View Post

Don't know if you noticed my earlier question: How long will these replacement fans last in comparison with the originals? My experience with computer fans is that they're great when brand new but seize up very soon afterwards.

Sorry I missed it !

I don't know yet since the older SilenX fans I've putted in a projector is only for one year and a half till yet

John

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post #22 of 113 Old 01-30-2007, 11:07 AM
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John et al,

I've posted this on Curt's site in the Advanced Procedures section.

See here: http://www.curtpalme.com/G70_fan_mod1.shtm

Kal

P.S. I recently did a similar mod to my Zenith 1200 that'll work on all Barco 808/Cine 8 projectors. Look for pictures/procedure soon.
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post #23 of 113 Old 01-30-2007, 12:56 PM - Thread Starter
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Thanks kal,

FYI, I'm planning to post another procedure to do the tubes replacement on G70 (including nude tube mounting on Sony mechanics and C board update in case of P16LJE06/07 tube use).

I'll do the same for G90 but later-on

I will post the G70 tubes replacement procedure soon, stay tuned !

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post #24 of 113 Old 01-30-2007, 03:57 PM
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ohh....ohh...

perfect timing John....I'm just preparing myself to do said swap soon. Your clear photos and explanation will be of great help......can you do the anode replacement too....

Looking forwards to this.

Thanks

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post #25 of 113 Old 01-31-2007, 12:52 AM - Thread Starter
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Quote:
Originally Posted by newbieDAN View Post

can you do the anode replacement too....

Yes, main part of the job is the HV cup swap between used and new tube Also, my procedure will let people keep all the glycol during the glass swap

But it's OT, let's dicuss this on the future relevant thread

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post #26 of 113 Old 01-31-2007, 09:30 AM
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Quote:
Originally Posted by JohnHWman View Post

The G70 unit hold three 120x120x38mm Japan Servo CNDC12B4 (40dBA noise each !) that draw ~85CFM each. Then, I would assume that changing these fans to SilenX IXP-76-14 (72 CFM) is the best replacement part versus the original 85CFM. Note that there is also the 90CFM version (IXP-76-18) from SilenX that could be use for this fans replacement but the noise is rized from 14dBA to 18dBA each.

John, as a follow up, I'd highly recommend you consider using the 90CFM fans in the future as SilenX specs are not very accurate.

All of their fans measure considerably higher in dB's than what the manufacturer claims, and the CFM's are often lower as well. Search the web for any SilenX reviews....

I use both the 72CFM and 90CFM 120mm SilenX fans in my Zenith 1200 (Cine 8 Onyx). Not much of a difference in noise level so I used the higher CFM ones whenever possible (when they would fit).

Kal
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post #27 of 113 Old 02-02-2007, 12:21 PM
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I checked with them, and the fans are guaranteed for 2 years. They have a supposed life of 100K hours in 25C, as long as they are cleaned of dust periodically. I bought 3 of the IPX-76-18, 90CFMs today, as I would rather be safer to cool more than just suffer with a 4 db difference in noise.

JCP
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post #28 of 113 Old 02-04-2007, 05:10 AM
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John,
These replacement fans are rated at 72CFM and on your site you have an excellent article about venting the G70 under the sofa. In this article you use a 250CMH extractor (about 147CFM if my maths is correct). Shouldn't it be 3 x 72 or 216CFM at least else the three internal fans will be driving the extractor, surely?
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post #29 of 113 Old 02-04-2007, 05:44 AM
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Quote:
Originally Posted by barcoed View Post

John,
These replacement fans are rated at 72CFM and on your site you have an excellent article about venting the G70 under the sofa. In this article you use a 250CMH extractor (about 147CFM if my maths is correct). Shouldn't it be 3 x 72 or 216CFM at least else the three internal fans will be driving the extractor, surely?

My guess is because of the grates and electronics that the fans are blowing over and because the static pressure of these type of fans is very low, you will not even come close to achieving the 216CFM the three fans should be putting out.
Those grates alone are a big obstacle for the fans to overcome and IMO should be removed.

Terry

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post #30 of 113 Old 02-05-2007, 02:25 AM
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John,

Can you also show me how to avoid electric shock during tube replacement?

Thanks

Cheung
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