Effluo (25th August 2011)
DLP? you mean whats wrong with DLP?, they are so unreliable to many moving parts, they have a high speed spinning disk inside this rotates at very high speed and its very brittle so any movement causes it to flex and oftem break (shatter) most projectors can be repaired quite cheaply untill you get to DLP, try a search on here for Unify 35, its a smart board DLP unit made by NEC for smart look at what people say about it.
DLP is definatly NOT to be used as a portable unit because of its inherent problems, LCD is more reliable and in practice more efficiant (power wise) and brighter per watt. LCD units are less prone to damage by movement and new lamp tech on say Epson means instant off and can move them even when on so will take accidentle bumps in use with no problem.
I know LCD units still in use from 9 years ago and still serviceable.
Effluo (25th August 2011)
We always replace the whole unit.
Too many experiences in the past where changing the bulb hasn't improved performance.
Yes that is common where people have not had their projector serviced or the lap has not been changed at its correct hrs, see my post on Lap Life and how it works.
Guys, we have a few NEC projectors (particularly vt48) where the image is dark (blue-ish) to one corner or side. In your experience does changing the bulb solve that at all? or is that more an age perminant (and yet to worsen) issue?
Resolution - have your laptops, PC's out stripped the resolution of the projector? Latest laptops have different screen ratios and resolutions which will put the projected image under strain. Think of what your pupils are having to put up with, are they getting eye strain?
Image - if you have any discolouration of the image (blue blobs, Nicotine stain, greenish hues) then your additional concern is dust and dust burn, if it's blue blobs (best seen if you move zoom & focus to one full stop) then you've got dust on the internals, which if left untreated will over heat the unit and lead to the next issue of dust burn where lens surfaces can become pitted and damaged through simply having hot dust on the surface.
Apart from the green perspective in the current economic climate the trend is to make do with what you've got but with that comes other issues, if you want to get the most out of your existing equipment you need to put a proper maintenance program into place. Just like your car you'll get more mileage out of it if you service the units regularly. Even if it's new you and still under warranty, you should maintain on a regular basis, (again like your car - warranties are void if you don't service).
So it's not just the cost of the bulb it's the other stuff that goes with it on the up side, if you do continue with existing stock, you don't have the disruption and cost of projector refits involving new bracketry, and cabling.
Checkout AV preventive maintenance companies, there's one I know in Cwmbran that also has a lab where they can rescue sick projectors.
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