CurtPalme.com Home Theater Forum

Andy_34 · Posted: Sun Jul 15, 2012 7:55 am Post subject: Fan Mod Sony 1271

Hi Guys,

i´m changing the fans in the Power Supply. I´m replacing the original ones against Papst Fan.
Since the Papst Fans don´t have the Sensor wire (yellow wire) i think i have to put the yellow wire in the plug on 12V DC, so the projector thinks the fan is still running. Is that correct?

2nd question: To do the fan mod i pulled the power supply out of the projector. Before i put it back in, can i hook the power supply to the ac outlet and get it started with the remote controll to see if the fans are working?

Greets,
Andy

fuchs · Joined: 27 Jun 2012 Posts: 80 Location: the NL

Andy_34 · Posted: Tue Jul 17, 2012 7:39 pm Post subject: Getting error code 01

Hi Guys,

here is an update:

i put the original fans back in the power supply. But unfortunaly i get the error Code 01 (Fan stop) after 1-2 seconds after starting up. I can see that all fans are working.
i cut the yellow wire and wired it directly with the black one (only for the fans in the power supply).
Still i get the error code 01

The other fans are still the original ones. i didn´t even disconnect the plugs.
I´ve got the Dealers manual, but i need a liitle help to find out where to look.
Maybe ther´s a way i can disconnect the whole fan protect circuit.

Greets,
Andy

barclay66 · Posted: Tue Jul 17, 2012 8:08 pm Post subject:

Hi,

You should have left the yellow wire where it was. As stated before it carries a pulse signal coming from the fan(s). The circuit responsible for detecting the presence of the pulses is quite important. Major damage may occur if the projector is being used without proper cooling and the circuit is intended to prevent that if for example the fans get stuck with dust.
You should instead look for fans with three wire connector. Fans from beQuiet usually have them and I have found them to be well designed and affordable at the same time.
If You still want to go the risky way You will need a pulse generating circuit (e.g. Built around a NE555) in order to simulate the pulses from the fans. I wouldn't try to disable the sensing circuit...

Regards,
barclay66

Andy_34 · Posted: Wed Jul 18, 2012 2:03 pm Post subject:

Hi Guys,

here´s an update:
i put the original fans back in the power supply. I also wired the original connectors back on the wires. Even the yellow one.
After switching the power back on, all fans are working till the projector switches off after 2 sec and i get the error code 01.

What now??

Greets,
Andy

**ecrabb** · Posted: Wed Jul 18, 2012 2:28 pm Post subject:

Are you sure all fans are spinning? I don't recall how many fans are in a 1271, but there are a number of them. There are the fans in the PSU, then there are a couple of fans up on the main board... Can't remember if there are others.

Just to be clear, was the projector working before you started the fan replacement project?

SC

barclay66 · Posted: Wed Jul 18, 2012 2:51 pm Post subject:

macgyver655 · Joined: 22 Aug 2007 Posts: 6965

Andy_34 · Posted: Wed Jul 18, 2012 6:13 pm Post subject:

Hi Guys,

the projector worked fine before the fan mod. And i´m sure that all 5 80mm and the 1 40mm fan are spinning if i switch the projector on.

Is there an easy way to disconnect the fan protection circuit? I´m fully aware of what can happen.

In german forums they say, if you connect the yellow wire with the black wire, the fan protection is disabled. But they say you have to do it for every fan.

Greets,
Andy

fuchs · Joined: 27 Jun 2012 Posts: 80 Location: the NL

well... do what you have to do...

i'd first try to make some sort of 3-wire extension cord and wire the fans to an ordinary PC.
Most PCs have a BIOS-setup that lets you monitor hardware (temperature, RPMs, etc).
Then check if all fans actually output a pulse when turned on.

If they all do, you could have blown the protection circuit.

Anyway, maybe check the service manual for "hidden fans", you may have forgotten you had Smile

rosenbush · Joined: 14 May 2010 Posts: 77 Location: Brownsville Texas

There is no pulse on the yellow wire.

Just make shure you bridge the yellow one with the black one at the board side (not at the fan side)
If you use a regular fan (made for PC) and if you use the connector that comes with it you may need to realocate the 12 volts wire, you can compare it with the fan you just remove.[/s]

Andy_34 · Posted: Mon Jul 30, 2012 7:27 pm Post subject: Problem soved

Hi Guys,

first i want to tell you, that i solved the problem.
But i really don´t know how. But first things first.

First i bought one of the prover´s sony 1271. Tested it, and it worked just fine.
So i started to change some components.
First the power supply - no luck
2. the L Board - no luck
3. the Y Board - no luck

then i wanna to change the E and the DC board. As i removed these boards from provers crt i realised that his 40mm fan has only 2 wires. A red and a black one. My 40mm fan has 3 wires. Red, black and yellow. So i switched the fans and my 1271 suddenly worked fine. I rechanged to my fan and disconnected the yellow wire and it worked fine.

And before i started to install my sony under the ceiling i did not change anything and it worked fine for about 5 years.

But i have to say, i disconnected and removed a lot of parts to lighten the beast to install it under the ceiling.
Can it be, that the yellow wire from my 40mm fan was not really connected in the plug?

Greets,
Andy