[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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