sidewinder Posted April 5, 2011 Posted April 5, 2011 We have a Sanyo PDG-DSU21b projector, and over time, white spots have started to appear on the projected image. I would guess it is dust? But where? I have changed the bulb and cleaned the external glass of the lens. But the white spots remain. Could it be something else?
Marc-Engineer Posted April 6, 2011 Posted April 6, 2011 You would not get white spots from dust , dust would stop light, white spots would be faulty display, i would need more info to advise further. Marc Projector Engineer
sidewinder Posted April 7, 2011 Author Posted April 7, 2011 Thanks, I'll get a picture later to show you what I mean
Steve21 Posted April 7, 2011 Posted April 7, 2011 I have changed the bulb and cleaned the external glass of the lens. But the white spots remain. Could it be something else? Sadfully, the general answer is a pixel is dead. Bearing in mind the lamp only shines light "through" the LCD screen normally, it will just go through as white light. Steve
sidewinder Posted April 7, 2011 Author Posted April 7, 2011 Oh dear. I'll have to find out how old the projector is, it doesnt look that old but I guess it could be. Would it be covered by the warranty if it is still in it?
Steve21 Posted April 7, 2011 Posted April 7, 2011 Generally I think it depends on company/warranty etc, Some say up to 5~ pixels is "norm", some don't etc Might be worth checking a few other ideas first, but pretty much sounds like dead pixel. Is it a lot that are dead? or just 1-2? Steve
sidewinder Posted April 7, 2011 Author Posted April 7, 2011 Oh so it is similar to actual LCD screens then? It is a lot, there is a scattering of them over one side of the board - think it has got progressively worse
Steve21 Posted April 7, 2011 Posted April 7, 2011 Oh so it is similar to actual LCD screens then? It is a lot, there is a scattering of them over one side of the board - think it has got progressively worse Well simple version, the lights split (3 colours etc), passed through the LCD screen, which obviously stops certain colours etc etc. If it's dead pixel, aka always "off" its never blocked, so white light. Guess it might be worth checking with the warranty/supplier. Steve
sidewinder Posted April 7, 2011 Author Posted April 7, 2011 I meant similar to LCD screens in that a certain amount of dead pixels is considered acceptable - I've never seen them on a projector before so didnt realise Attached an image that shows it fairly well, also some of them flicker a bit
Steve21 Posted April 7, 2011 Posted April 7, 2011 Ah my bad, but yeah looks like them. Be good to know how the suppliers act on the warranty side. "Normal wear" complaints inc Steve
Marc-Engineer Posted April 7, 2011 Posted April 7, 2011 In therory your right but in practice you would have to have a pixel in each screen in the same place to get a white light, so if your right i would go buy a lottery ticket as it would be a one in a milliion chance, but seriously i am interested to see what it is, i have repaired hundreds of these and NEVER seen a white pixel LCD problem i think it more likley to be a contoller issue, but get me a photo and or if you lke i will ring you to get to the bottom of it PM me and i can ring you. Marc Projector Engineer
sonobenissimo Posted August 15, 2011 Posted August 15, 2011 A tad bit late to this thread but was wondering if a solution to the issue of white pixels appearing in clusters was found. I have an Optoma DLP projector and have recently encountered the same problem, the white dots also appear to be increasing in quantity so a response would be much appreciated. Thanks!
elsiegee40 Posted August 15, 2011 Posted August 15, 2011 I'm afraid the only solution to dead pixels is to send it back for repair @sonobenissimo I had this on a Casio LED projector which was under guarantee fortunately... they do get progressively worse once it has started too
Marc-Engineer Posted August 17, 2011 Posted August 17, 2011 Yes they do get worse we call it creaping coruption, as it seems to grow once started (oh dear another DLP), if its not uner warranty then it will be a replacement, sorry. Marc Projector Engineer
wattsnxt Posted February 2, 2012 Posted February 2, 2012 I have seen this problem in a lot of infocus and sharp projectors. It is a defective DLP chip, however I have never sent one in for repair so I don't know how expensive it would be. Also I've never been able to order a replacement DLP chip from any vendor either.
kevin_lane Posted February 2, 2012 Posted February 2, 2012 we have had these issues they cant be repaired and tbh i have to change brand im staying away from sony you want to get one these NEC M230X Projector brill i got them from av parts master avpartsmaster.co.uk guy their called paul jennings nice bloke
jnbtex Posted February 3, 2012 Posted February 3, 2012 We have an NEC NP115. It started doing the dead pixel thing about 2 months ago (the projector is about 2.5 yrs old). It started off with a single dot, and not has hundreds. There are both white ones and black ones, and now there are so many it is nearly impossible to watch. I'll be checking now to see if anything might be covered.
Marc-Engineer Posted February 3, 2012 Posted February 3, 2012 Yes you can get it with DLP but on LCD it is a mystery? Marc Projector Engineer
jonspurs Posted March 2, 2012 Posted March 2, 2012 Just to say we've got 2 NEC NP215s now spraying white paint...well that's what it looks like...they are DLP. None of our LCDs ahd this problem...our older LCDs started to go with a yellow haze. Jon
fromtheinternet Posted January 23, 2013 Posted January 23, 2013 Resurrecting an old thread, but this has recently happened to one of our Toshibas. The general consensus is that you need to replace the DMD chip: DMD Chip Considering the cost is a third that of a new projector, I don't think we'll bother taking the chance.
jonspurs Posted January 26, 2013 Posted January 26, 2013 We've gone with Epson EB-X11...bit of research shows Epson are rated the best for projectors...but I guess some of you knew that already.
Marc-Engineer Posted January 29, 2013 Posted January 29, 2013 Yep we did, great value more cost effective than any LED projector make sure you get the 5 year education warrenty. But what ever you do DONT BUY DLP for schools. Marc Projector Engineer
Oaktech Posted January 29, 2013 Posted January 29, 2013 I've had an Epson do this... and an NEC - both LCD, turned out to be a driver chip breaking down (supplied by NEC) was more expensive to have repaired than to get a new projector.
timbo343 Posted June 23, 2014 Posted June 23, 2014 Sorry to bring up an old thread but we have some NP200 projectors which have the white dots on. Just got a quote from NEC about this, £500 to replace.
IT_Ninja Posted June 23, 2014 Posted June 23, 2014 White dots are usually indicative of dust/ dirt on the lens or the DMD chip is faulty. Might be time to look for some new LED projectors... Depending on what you can afford. How old are the projectors? Still under warranty?
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