Question about InFocus ScreenPlay 4805 Multimedia Projector

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Infocus 4805 - Doesnot display and make noise at start-up

My Infocus 4805 pj was fine until 2 weeks back. Last weekend it did not respond to the remote and I manually started it. It is making sqeaking sound for about 15-30 seconds (with green light blinking) and the LED turns to red (1 blink) but no display. I cleaned the lens and checked the bulb, it seems to be OK. The sqeaking sound still exists whenever I start the pj. (I can't check the lamp hours used since there is no display - but I guess it will be around 2000 hrs).

Please suggest what I should do.
Thanks,
SG

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  • beholder70 Nov 25, 2008

    exact same problem here. anyone knopw what it is?

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  • 167 Answers

Well a single red blinking means the lamp won't strike after five (5) attempts. The "squeaking" sound if it's coming form the large fan usually always means the Mos-Fet fan speed controller chip has failed which presents sometimes as an intermittent squeaking sound. Which would implies the lamp may have failed from the resultant over temp. However if the squeaking noise is coming from the color wheel that would mean it's bearings have failed and if is is unable to phase lock at reference speed the lamp would also not strike. The odd symptom is the remote thing... That does not fit! If is actually is related to the common cause of all the problems... That leaves only the power supply has partially failed (not too expensive) causing all of these symptoms.

Or murphy has moved in...

Good luck!

SagerTronics

Posted on Nov 29, 2009

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Posted on Jan 02, 2017

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Its commonly refered to as a Light Tunnel Failure. Go to www.avsforum.com and search for "4805 Light Tunnel" and you will finds threads on how to fix the problem.
If you have never opened the PJ before, there are 1-2 threads about opening the cabinet.
I also posted a DIY replacement solution that may help:
http://www.avsforum.com/avs-vb/showthread.php?t=1304694

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could be the fan should be running to cool the lamp. there could be temperature sensor that is why it is shutting down to save your lamp.

check the fan if it has continuity. it could be broken and need to be replaced.

tnx 4 using fixya,

drcool

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My first questions is:

Is this the first lamp you have placed into your Infocus pj? If not, did you reset the hours when you did it last time? Otherwise that can also confuse the projectors internal system thinking there is NOT a new lamp in there and there for make it stop working once the clock hours are expired and over the 3000-6000 suggested hour life.

Let me know so I can help trouble shoot other possible problems.

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Have you checked with the manufacturer regarding a firm ware upgrade? There was an issue with this at one point. Make sure to contact them directly. They can either mail you a cd version, direct you to where it might be on their website, otherwise email it to you.

They are able to fix that problem which my sister and my other sister/brother in law also owned this same pj had to do the same thing.

Let me know how it goes for you. Best of luck!

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Have you checked with the manufacturer regarding a firm ware upgrade? There was an issue with this at one point. Make sure to contact them directly. They can either mail you a cd version, direct you to where it might be on their website, otherwise email it to you.

They are able to fix that problem which my sister and my other sister/brother in law also owned this same pj had to do the same thing.

Let me know how it goes for you. Best of luck!

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Contact the manufacturer for a firm ware upgrade. My two brother in laws/sisters own this same pj and had the same issues you are talking about. Once they installed the update [aka: firmware upgrade]it created a solution to the problem.

Let me know how it goes. They can either mail you a CD, direct you to where on their website, otherwise email you the update to download. You have to connect your pj as well.

Let me know how that goes. I'm fairly confident that will fix it. There was a certain time frame [manufacturer dates], and serial numbers that had these issues.

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1 Answer

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First: Check your connections. Some times people can have the cables connected the wrong way in the pj which makes the screen either all red or distored looking, etc.

If that doesn't work..

Then any thing that has horizontal or color lines, dots, or zig zags on the pj means something wrong with the mother board. This is something that you can not typically do on your own. The best way is to have an authorized in focus dealer work on it, even if its no longer under warranty you can find out great locations through their website or themselves for the people whom are used to fixing pj's otherwise you might run into other problem if some one is not experienced in pj work.

I've worked for a competitor to this brand in the past and that was always a huge sign that something internal was going on if it wasn't a connection error. 9 times out of 10 it was an internal error. I did have some one whom hooked up his component cables wrong which created a red/green image. Once he fixed that it was okay after that.

Let me know how things go. I wish you luck. Some times its hard to trouble shoot all the way through with out being there. Let me know how things work out.

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I'm not sure. This is a much older projecter which came out around 2003-2005. It is hard to find any new ones otherwise they will be refurbished or used.

Have you contacted the manufacturer regarding a firmware upgrade for your pj? That can fix some errors some times. My sister/brother in laws both had the same pj and that fixed this issue.

Otherwise we do not sell any products on here we only suggest and offer solutions to errors or problems.


Good luck and let us know how things work out for you!

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