[TechAssist] Re: INFOCUS #LP290 LCD Projector-Lamp won't start

        Strike voltage is a momentary 1000-3000v. Sony supply to the ballast is
250vdc. When they strike you can hear a slight buzz and if looking at it can
see a flash inside a spark gap. Tries 3 x then gives a no lamp indicator.
Can check connections to the lamp it self. Lamp checks open when good. Fans
and [color wheel for DLP] must turn but their may be a separate fan or
overheat indicator.  Some bulbs just don't seem to last long, if they
improved the ballast design may increase lamp life. Extra off on cycles may
shorten lamp life. That's about all I know.
        Bob
        Leader Tv and Video
        Rochester, NY

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of al m
Sent: Wednesday, March 30, 2005 9:40 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: INFOCUS #LP290 LCD Projector-Lamp won't start


Starting to look to me that these sets with the lamps and ballasts are junk.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Dale Lubow" <harristv50010@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, March 30, 2005 9:25 PM
Subject: [TechAssist] INFOCUS #LP290 LCD Projector-Lamp won't start


>I am trying to repair an INFOCUS Model# LP290 LCD Projector. The fans run,
> it knows when there is a source connected to it. Looking at the lamp,
> everything looks ok.
>
> The lamp assembly plugs into a connector block with two contacts. I have
> been reading the RCA technical manual on there DLP units, trying to
> understand how these lamps are started and  kept lit.They talk about a
> lamp
> ballast supply and that is strikes an arc to light the lamp. They really
> say
> very little about making sure it works.
>
> Is there any way to make sure a lamp is capable of lighting other than
> just
> subbing in a new one, which I can't afford to do unless it solves the
> problem?
>
> Is there any way to make a measurement where the ballast connects to the
> lamp to see if the supply is trying to light the lamp?
>
> Is there any chance anyone out there may have a schematic of this unit?
>
> I need to learn what makes these things tic since I also just got a Sharp
> &
> Sanyo LCD projector in which I haven't checked out yet.
>
> Any information would be appreciated
>
> TIA,
> Dale
>
> Dale A. Lubow C.E.T.
> Harris TV & Appliance
> 335 Lincoln Way
> Ames, IA 50010
> 515-232-1109 (Voice)
> 515-232-3356 (Fax)
> HarrisTV50010@xxxxxxx
>
>
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