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Green blob on screen projector

I have a infocus lp820 projector that has a green blob in center of screen when using.

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Posted on Jan 02, 2017

  • 472 Answers

SOURCE: Infocus LP820 - Turns on for 30sec then shuts down

This could be one of two problems I have seen with another model Infocus projector (they are very good projectors though)

The first is the video input. Make sure it is attached correctly at both ends of the cable.
The second, remove the dust covers and blow them out. The problem can arrise if the temperature sensor detects the air inside the unit is getting too hot. If you can see the sensor when the dust covers are off (it will look like a little lump of goo on the end of a wire) then just give it a wipe as well. If dust settles on those it can cause incorrect temps to be reported.

Hope that solves your poblem =)

Posted on Apr 11, 2008

  • 1 Answer

SOURCE: infocus lite pro 720

Sounds like the LCD inside is dying and you're losing pixels. Bummer.

Posted on Sep 26, 2008

  • 1 Answer

SOURCE: hey there, lp820 user

No I was never able to come to a resolution for this projector.  My next step was to buy a new bulb but I haven't gotten around to that since I already have another projector that works.  If you do buy a new bulb, let me know if that fixes the problem.  The only other thing I've heard it mind be was a memory problem or the temperature sensor...  good luck

Posted on Nov 17, 2008

  • 82 Answers

SOURCE: Hello, I have a NEC NP1000

If there is a reset to factory default, try that. Seems like some setting for screen zoom, or height/width adjustment got tinkered with.

Posted on Dec 02, 2008

  • 210 Answers

SOURCE: PS3 to Infocus LP 350 projector using HDMI


M1-DA is a type of DVI connection that produces both analogue and digital signals, the easiest and most quality source cable for you to get is a HDMI to M1-DA cable which is now widely available for purchase.

Infocus should have included this cable in with your projector, but instead the power at bee decided to put a M1-DA to DVI-D cable instead when most visual devices now support HDMI and not DVI nowadays.


Posted on Sep 05, 2009

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1 Answer

LP820 projector powers up and all is well. After about 40 seconds to a minute it powers down. Control panel lights are on and LCD display says restarting. It comes back on for a couple of seconds and...

It could be are any of the led's blinking. ?
The other thing is to check the bulb is seated correctly in its connector.
Try removing bulb and reinserting.
Also clean the air filters at same time to make sure they are fine.


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Feb 10, 2011 | InFocus SP-LAMP-012 Projector Lamp for...

1 Answer

I too have this problem with my projector infocus IN24, and it has slowly grown to extend almost all of the way up the center of the screen. I have reseated the bulb assembly laer change the lamp, and...

If you are experiencing a colured blob, usually lack of blue producing yellowy stain. The cause is excess heat on the blue LCD panel. This is a replacement job on the panel as it won't recover.
Keeping the air ways clean and filters clean will help to stop the growth.
Hope this helps.

Jan 19, 2011 | InFocus IN24 Projector

1 Answer

I have an infocus lp820 with what looks like an blue ghost omage in centre of screen,i suspect optical engine or lcd panels

This projector is one I've worked on many times and you are correct. The lcd panels are burnt probably due to a hard shutdown not allowing the fans to cool the inner components done repeatedly over several sessions.

Mar 22, 2010 | InFocus SP-LAMP-012 Projector Lamp for...

1 Answer

There are greenish spots on the screen (especially in dark areas) read somewhere they are dust blobs. I have removed lens and bulb to give them a blast of air, but blobs still there. How do i access the...

remove the rear cover then the top and look to where the lcd cables go down from the main board to the lcd panels. move the cable 1 at a time towards the connection on the main board just so you can see down into the panel and give it a good blast. de-ionized air works best. repeat for the other 2 panels.

Feb 25, 2010 | InFocus SP-LAMP-012 Projector Lamp for...

1 Answer

Have a infocus lp820 . There is a blue line on the

if it's a pixelated line, it's your lcd panel. if it's a blended, uneven line, it may the polarizer on the lcd panel. either way, you'll have to replace the whole optical engine.

Dec 07, 2009 | InFocus SP-LAMP-012 Projector Lamp for...

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Infocus lp820 i press power can not hear any fan moving lamp turn on with gray light after 10 sec lamp shut off and message says "fan stopped"

you need to replace the fans; they may have burned out. you could try to get one from an infocus service center or send it to them for repair, but know that this is an old machine and parts may not be available. you could try getting a used one on ebay that has a different problem and swap out the parts. if you do decide to send it in or find new parts, try av solutions in ny. they're really good.

Nov 12, 2009 | InFocus LP 820 Multimedia Projector

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I have an InFocus SP5000 projector that has started showing a green glow in mid-screen (center). Before I buy a $300 lamp want to know the cause of the green glow.

either the light filter behind the blue lcd panel or the fly-eye lens (both inside the optical engine) have developed a burn spot from overheating. infocus doesn't sell individual parts for the optical engine, and the whole thing must be replaced. but unfortunately, it's the most expensive part of the projector, usually upwards of $2000 (and there's none in stock).

Jun 24, 2009 | InFocus SP5000 Home Theater Projector,...

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Connecting Dell laptop to Infocus LP820

The USB cable doesn't transmit Video. You need to plug in the VGA cable. The "DVI" port on the LP820 is not a a DVI but a M1 Digital port and won't work with DVI unless you get a converter.

Nov 30, 2008 | InFocus LP 820 Multimedia Projector

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