Question about Multimedia Projectors

1 Answer

Lp335 in focus projector lamp not turning on; spark switch gap is sparking


I have an old Infocus LP335 DLP projector that I am trying to debug. The lamp is not firing and the spark switch gap is clicking and sparking when it trys. Perhaps the spark switch gap is bad and needs replacement or is this a sign of a bad lamp? Thanks in advance

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Expert
  • 261 Answers
Re: lp335 in focus projector lamp not turning on; spark...

It could be the lamp. I have seen this many times on DLP'S. If the ballast is firing it which is usually around 600 volts or so, then i would say it is fine, and only needs a lamp. Let me know if that helped you. Later Jay

Posted on Jan 31, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Does not turn on all 4 lights lit up on face of unit

Most likely the lamp is burned out. Check the lamp and if it is bad, replace it (unplug projector while you replace the lamp). If it turns on, reset the lamp counter and you're all done!
Be sure to weigh the cost of the new lamp vs replacing this 6-8 year old projector!

Jul 01, 2014 | InFocus Work Big IN34 DLP Projector

1 Answer

Infocus IN24 Projector has large Dark Grey/Black Spot in the middle of the image.Lamp has 600 hours,Installed my spare "NEW" Lamp,still the same,Bulb makes no difference.Was watching a movie...

There is a lens(looks like a small magnifying glass) made out of plastic that the light shines through to focus the light on the mirror before it hits the DLP chip, that lens is Melted in the center. I unfortunately had the same thing happen to me, and I am unable to find a replacement part.

Jan 16, 2011 | InFocus Work Big IN24 DLP Projector

1 Answer

My projector lamp goes off minutes after its been turnrd on and indicates a red light on top of the projector. any idea how to solve this problem?

I would suggest that it has a temperature or the lamp/ballast unit has a problem.
If the cooling fan is blocked then the optical block temperature sensor will shut it down. Make certain the filters are clean and all of the fans are running.
How old is the lamp? If it is quite old, more than 1000 hours, change the lamp, if it is newish then suspect the ballast unit.
The lamp will show black spots around the spark gap, a bit like a bad weld on two pieces of metal.
Hope this helps.

Nov 23, 2010 | Dell 1210S DLP projector 2500 ANSI...

1 Answer

I just replaced the lamp on an Infocus X10 DLP projector. The left half of the screen is now darker than the right side. What can this be? Thanks.

This is seemingly a common issue on the IN82 (which I've also had) and is usually resolved by switching off the 'BrilliantColor' setting in the menu.

Nov 09, 2010 | InFocus X10 DLP Front Projector 1080p DLP...

1 Answer

Projector attempts to light the lamp, but to no avail

the ballast is gone and needs replacing. unfortunately, infocus has no parts for that model.

Oct 30, 2009 | InFocus Multimedia Projectors

1 Answer

The tv shuts down and an orange light flashes

if it's the lamp led that is orange, turn off the projector for a minute and try it again. if the lamp goes out and the orange led comes on again, replace the lamp and reset the lamp timer.

Jul 25, 2009 | InFocus X10 DLP Front Projector 1080p DLP...

1 Answer

My Infocus DLP 4805 can't turn on

very possible the lamp is bad. Many projectors will not even power on once the lamp burns out. As for the strange noise, there may be something more serious wrong with it.

Jun 22, 2009 | InFocus ScreenPlay 4805 Multimedia...

1 Answer

Infocus LP120 Retrying-Power Light Turns Red...

Usually when the lamp is good and you get this message, the ballast is bad. That is the part thatdrives the lamp. Check with Infocus for a repalacement balast.

Apr 09, 2008 | InFocus LP120 / 1000 Lumens / XGA / DLP...

Not finding what you are looking for?
Multimedia Projectors Logo

Related Topics:

948 people viewed this question

Ask a Question

Usually answered in minutes!

Top Multimedia Projectors Experts


Level 3 Expert

2236 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

5327 Answers

Are you a Multimedia Projector Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides