The Offical Epson 8350 Owners Thread - Page 302 - AVS | Home Theater Discussions And Reviews
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post #9031 of 9037 Old Yesterday, 04:30 PM
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Questions for those very knowledgeable with this projectors, have ran them with the covers off, or have repaired them:

0.) I want to confirm the following is normal startup procedure. Anyone could (please!) try this if they run the projector with the lamp out, and the cover switch depressed (the cross shaped opening over a switch that the lamp door pushes on. A screwdriver works.):
A.) The front black, exhaust fan (looking down at the lamp well, with lens in front) doesn't run on startup. I believe it probably starts up later once the bulb gets up to temp.

B.) The auto iris is fully opened from whatever position it started in and left open

C.) The cinema filter slides back and forth once, to the end of it's travel (limit switches).

1.) Has anyone found a service manual for this model? Or at least a parts list?

2.) At the front left corner of the lamp well (looking top down, lens at front), where the lamp sits, there is a small (1" tall, maybe 1/4" wide?), white-ish ceramic (I think?) electrical component with two white leads. The front of this component is exposed, meaning, it can be seen from the inside of the lamp well. The wires run to the main switches. I believe it to be a thermal breaker, or thermal switch, can anyone confirm?

3.) My projector is doing the following: It turns on, lamp is energized/lit, and the word Epson becomes projected. All fans startup, except the large front black exhaust fan in front of the lamp, that blows out the front. The auto iris opens up to full aperture. The cinema filter slides back and forth once in each direction (hits the limits switches). Shortly after (about 5 seconds after the unit is turned on), the lamp shuts off, the fans ramp to full speed, and the Temp light begins flashing red on / off once a second. Fans run for ~1 minute, then it powers down. It now does this every single time. It was doing it intermittently for a few months, on startup - and very once in a while, it would shut off during use (but then usually could be turned right back on). It only started doing it after I replaced a lamp that failed catastrophically (exploded).

For these reasons, I'm thinking that the component I named is a thermal breaker, that is tripped and thinks it's overheating. And that it now failed completely. My auto iris and cinema filter work just fine from what I see.

Harman Kardon AVR 254 ● Energy Connoisseur C-7 ● Epson PowerLite 8350 ● 100" DIY WA DW w/ 80/20 frame
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post #9032 of 9037 Old Today, 05:30 AM
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If you look at the pic below you will see a sensor in the middle. The thing with 2 black wires running to it. This is a temp sensor, I think there is another near the lamp if memory serves correct.
During my repair I accidentally forgot to reconnect this and it caused the pj to shut down similar to yours.
I would look at maybe replacing the sensors
http://s25.postimg.org/69777owf3/IMAG0174.png
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post #9033 of 9037 Old Today, 10:48 AM
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My 8345 (2-3 years old with 2000 on it) has a red tint in the middle & a blue tint on the right. Is this the polarizers going? I just put in a brand new Epson bulb.

Thanks.
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post #9034 of 9037 Old Today, 11:58 AM
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Originally Posted by ashyt16 View Post
If you look at the pic below you will see a sensor in the middle. The thing with 2 black wires running to it. This is a temp sensor, I think there is another near the lamp if memory serves correct.
During my repair I accidentally forgot to reconnect this and it caused the pj to shut down similar to yours.
I would look at maybe replacing the sensors
http://s25.postimg.org/69777owf3/IMAG0174.png
Thank you, don't think I've come across that one yet! There is for sure, another temp sensor (a thermistor) on a tiny green circuit board, screwed to the outside of the lamp well, near the front. I verified it's a temp sensor (the resistance drops with heat and increases as it's' cooled off).

That said, I think I found my problem. As I noted above, what I was finding was that the large, black, axial, front exhaust fan, the one that's open to the lamp well, and blows out the front of the projector, was not turning on with the rest of the fans during startup, and remained off, even once the PJ shut off the lamp, and would flash the Temp light. I wasn't sure if this was normal or not. I thought maybe the PJ kept this fan off during startup to let the bulb warm up quicker?

I have since found out, that is not normal. Last night before I tore apart the projector again, I decided to try firing it up first... and it worked! Immediately, first try. I noticed that the front exhaust fan was on though, and came on with the other fans. I tried it a few more times with the lamp out, and it worked just fine, so I put the lamp in, tried a few more power cycles with the lamp in, still worked great.

So I took it to my Theatre, hooked it up, aligned it etc, worked awesome. I then continued to use it for about another hour, during which, as I was watching a DVD, it suddenly and inexplicably, shut it self off, and put the fans into high speed. This is the same thing it did before I started trying repairing it.

As I tried to turn it back on, it once again, did the same start-up behavior. About 5 seconds after turning it on, it'll turn itself off and flash the temp light.

I can only assume, that the front exhaust fan in question is flaky, and failing. The fan is a 3 wire fan, so it's likely that it has a tach signal it reports to the motherboard to say if it's running or not. My guess is, it stopped running, the mobo knew that from the tach signal, and turned off the PJ to prevent overheating. And I bet it's not starting up again with startup, thus it won't finish booting up.

Unfortunately, that fan looks like a nightmare to get out. It doesn't seem to be removable from the lamp well area, there is plastic covering the corners. And it looks like to remove it from the front, you'd have to turn it sideways and pull it out. I gotta take a look again.

Anyone replaced or removed this front exhaust fan? Any tips?

Harman Kardon AVR 254 ● Energy Connoisseur C-7 ● Epson PowerLite 8350 ● 100" DIY WA DW w/ 80/20 frame
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post #9035 of 9037 Old Today, 02:56 PM
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Originally Posted by SilverJS View Post
I'm sure some enterprising owners here have replaced their PJ's fan?
Which fan are you having a problem with? There are at least 3 different fans.
Are you sure it's the fan you're hearing?
Is your PJ turning itself off or erroring?

Harman Kardon AVR 254 ● Energy Connoisseur C-7 ● Epson PowerLite 8350 ● 100" DIY WA DW w/ 80/20 frame
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post #9036 of 9037 Old Today, 03:25 PM
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I just got my 8350 a couple of days ago from Visual Apex, new not a refurb. In doing some testing I was sitting right next to the projector. .

I'm running in Eco mode and with Dynamic, Living Room, Cinema, Natural the fan noise is constant and the same for all modes, but the fan noise in x.v. Color mode is not noticable at all, it just goes away as soon as I switch to x.v Color. Is this SOP for the 8350? The fan cranks up again immediately as soon as I switch back to any of the other modes.

The fan noise is the only negative I've come across, I think it's louder than the 22db-28db I see quoted in reviews and will be somewhate noticeable in quiet scenes once I get the pj installed on it's shelf (after basement repairs). Otherwise I'm pretty impressed the projector, especially at the closeout price.
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post #9037 of 9037 Unread Today, 06:18 PM
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Quote:
Originally Posted by Protonus View Post
Which fan are you having a problem with? There are at least 3 different fans.
Are you sure it's the fan you're hearing?
Is your PJ turning itself off or erroring?
I did not know there were three - but what the heck, I'd change all three of them as the unit is four years old.

The projector is not turning itself on and off, and no errors. There's just some noises coming from the PJ that are clearly from fans dying, noises I've heard before in PC's.

Are all three fans accessible and user-replaceable (assuming a certain degree of skill)?
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