Question about BenQ PB7200 DLP Projector

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I put in a new bulb and now I get a dark shadow on all but part of the viewing area. This darken area is not fixed giving me the impression that something is cracked inside

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Huikty

Posted on Jan 02, 2011

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How do I get rid of the dark shadow across the top of the screen?


This is actually a fairly common issue with the NEC projectors, especially if they are mounted from the ceiling (upside down). The problem is the compartment immediately after the bulb. What happens is the 'paste' they use to adhere the glass prisms to it's plastic component wears off overtime due to the immense heat from the bulb being projected onto it. The glass prism piece ends up leaning against the bulb compartment creating the annoying 'shadow'.

Heads up; you will need to take apart almost the whole projector. You'll need to expose the mirror array to get to the compartment just after the bulb. Once you've dissassembled the projector down to the mirror array, take out the problem part. It's a small black plastic cube frame that's held in by a screw and has 3 glass/plastic prism pieces. Looking down at the disassembled projector, you may not be able to see the glass/plastic prism pieces but I can assure you that it is the small compartment immediately after the bulb compartment.

Once you've identified the component and taken it out, you'll see the prism piece(s). The problem prism is the one that sits closest to the bulb and it was either slightly loose or had fallen off completely. Please note that there is another one of these exact prisms on the other side of the assembly you pulled out just behind the plastic looking prism. This secondary one come loose very rarely but if it does, you'll need to fix that too.

The Fix: Since the component is going to be exposed to immense heat again, you'll need to buy an adhesive that can withstand that heat (think at least a few hundred degrees for safety sake). I bought the JB-Weld Steel Reinforced Epoxy since it can withstand heat up to 550F. Make sure you read the instructions before starting. An added suggestion is to scrape all the old residue from the old adhesive off the component and prism(s) first, then scratch some grooves into the connecting pieces and apply the epoxy/adhesive. Do not scratch up the actual prism itself; scratch the 'extra' glass on the prism piece where it will connect with the plastic component. The grooves help the epoxy bind to the pieces and I highly suggest this since I've had to re-do a few in under a year. Let the epoxy set for a good 24 hours before putting the projector back together.

Nov 03, 2014 | NEC NP400 Projector

1 Answer

Pictures being viewed are flashing in some areas of the photo


You're seeing blown-out highlights. Those are the areas of your pictures that have lost all detail by going pure white. In general this is considered a bad thing. The correct fix is to reduce the exposure to bring back the details. This may lose details in the shadows, but that is generally preferrable to losing details in the highlights. After all, we expect not to be able to see things in the dark. Of course, this is only a warning; the camera doesn't know what kind of effects you're trying for.

That was the long answer. The short answer is: press up/down on the multiselector to cycle through the different views of your picture.

Sep 04, 2010 | Nikon D60 Digital Camera

1 Answer

My rca Thompson MM52110 tv picture is too dark even in the light setting mode is there a way I can fix it so I can watch movies and play games in a lighter setting?


Is it a DLP set? Could be the bulb going bad, some times the arc tube in the bulb darkens with age, the arc still fires but less light comes out

Jul 03, 2010 | RCA MM52110 52" Rear Projection HDTV-Ready...

1 Answer

Dark shadow on left side of laptop screen


THE SCALAR OF YOUR LCD ARE LEAK IT'S RECOMEND TO REPLACE A NEW ONE LCD

Aug 18, 2009 | Computers & Internet

2 Answers

SPUTTERING WHEN HOLDING 50-60 MPH


Since it ran fine before you "fixed" it, go back over the things you changed. Put the old spark plugs back in it. Double check all spark plug wires and ignition connections. Put the bike in a dark area and run it at night, can you see any arcing anywhere?

Jul 01, 2009 | 2004 Honda VT 1100 C Shadow Spirit

1 Answer

Shadow's


try to reset camera or you may need to brighten the exposure

Sep 17, 2008 | Olympus EVOLT E-500 Digital Camera

1 Answer

Hitachi Ulatravision Digital TV....... have a yellow shadow around part of picture


it might be scorch mark starting from the bulbs heat or someone placed a magnet close to machine that gives the same impression

May 09, 2008 | Hitachi UltraVision CineForm 55VG825 55"...

1 Answer

Flashing shadow area on olympus e500


While in playback mode, image is blinking, the word shadow appears in lower right hand corner, use the info button repeatedly until all disappears and image is pure.

Mar 25, 2008 | Olympus EVOLT E-500 Digital Camera

2 Answers

DARK HORIZON AREA AT TOP OF SCREEN


not sure but you could have a bad color wheel i would suggest a service call from your local shop

Jun 07, 2006 | Samsung DLP HL-P5663W 56" TV

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