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I have a philips projector model lc4433. I need a part but I am not sure what it is called . It is part of the prism system. It is one of the small prism's/mirrors . There is a set of 3 on a mount behind the lens. Can you assist me in identifing the part and sourcing a replacement ?

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These parts are fixed during production and are not individually replaceable parts. The entire prism assembly needs to be replaced. This is an unusual repair request though. Why do you think this needs to be replaced? Is it physically damaged? If so, there will be additional convergence adjustments and alignments that will need to be done as well. This will require somewhat specialized test equipment to perform. This unit should be sent in for service.


Posted on Jan 29, 2009

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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.

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How reset lamp timer of a csmart sv2 lc 4433 proyector?

Press menu
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I have the same problem with my pjtx100 after changing the lamp at 2000 hrs @$450 THE SCREEN STARTED to go blue at just over 2years use sent it back to the supplier who happen to be sony dealers they said...


Unfortunately, the value of projectors drop quickly after the production run ends. You will most likely find that the price of the blue prism will be higher than a comparibe working projector of the same model on ebay. I have a Panasonic PT-AE 900U, 1100 lumens 720P 5500 contrast. To replace the main board (if you can find it) cost over $700 from a supplier. The same projector used are going for $300 - $500 in working condition on ebay. I just bought another one and it gets a great picture plus I have a second bulb as a backup with a few hundred hours left on it. I still haven't thrown away the ailing projector in hopes of someday finding a cheap one for sale with a good mainboard and a problem else where. Now I can afford to wait for one to become available.

Hope this helps,

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I have two Sony PX11 projectors, one with a bad (discolored prism). How can I pull the prism out to replace it?

it's not the prism. chancs are it's the light filter(s) on the lcd panels. the prism is just coated glass. the light filters determine the color. you need to take the top off, the main board off (unplugging the ribbon cables), and the lens off. the lcd panels anf the filters are attached to the prism. remove the filters, but do not remove the lcd panels!

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I have a hitachi media projector and a blue patch is growing on the screen. i have read that this is caused by the prism. do i have to send the projector in to be repaired or can i buy a prism somewhere...

it's not the prism, it's the light filter on the blue lcd panel. it's starting to fry due to dust and heat. it does need to be replaced, but most companies won't just replace a part in the optical engine, so you'll have to replace the whole optical engine. and it's pricey. but find a hitachi service center (on their website) and ask them.

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It is necessary to clean up the prism of your projector. Call the authorised personnal for the servicing. For best result give your projector to nearest SONY SERVICE CENTER.

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Best regards,

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I have the same projector, but my problem is with red.

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If you can get your hands on another projector for cheap, that's your only hope. You can swap out the blue lcd panel from your prism with someone else... it's a bit of mucking around, but worth it of you can.

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Thanks for contacting us regarding your product questions or concerns. It appears you are wanting to know how to reach the glass prism from your 4805?

My initial question would be, why are you looking to access the glass prism in your 4805? This is a very dilicate process internally of your projector which helps it opperate. Are you trying to self-repair your projector?

Let me know. I'll be waiting for your reply.

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