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Hardware Thread, Sanyo projectors - yellowing in Technical; Is anyone else having problems with sanyo projectors? The vast majority of mine are starting to develop a yellowing in ...
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    Sanyo projectors - yellowing

    Is anyone else having problems with sanyo projectors?

    The vast majority of mine are starting to develop a yellowing in one corner/side (which side/corner depending on whether it is upright or upside-down!) - it has been sent to promethean who said it was dirty and needed cleaning, as well as a new bulb, as it had been used for a whole 50% of its capacity (point being?!). Anyway I know for a fact it isnt dirty inside (wink wink, nudge nudge) and has been cleaned in excess of their guidelines. He suggested my school was particularly dusty.... I said if I cleaned it well within their guidelines of monthly, how is it my responsibility... brick wall! Again, my school must just be dirty...

    They want £175 to clean it, and I am not allowed to take the cover off myself as this will void the warranty.

    He explained that when a yellowing occurs in a particular area, it is a result of an internal filter burning up - but it just so happens, for me, that wasnt the case (an expression from the royales comes to mind!). So he kind of admitted they run too hot anyway....

    So what do I do? All the projectors are now showing signs of this. I have spoken to a guy at another school who has literally just been sending them back and fourth for the past year! Not the solution I want.

    Grrr!

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    Re: Sanyo projectors - yellowing

    I've had this on Mitsubishi's - its expensive and annoying - haven't found a real solution though.

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    Re: Sanyo projectors - yellowing

    This happens because the filters aren't being cleaned.
    When the filters become clogged, air gets sucked around the filters. This allows dust to get onto the lenses (there are lots of lenses). Eventually the dust gets burned on, causing yellowing.
    First you need to get a maintenence schedute together to get the filters cleaned once a month or more regularly if needed. I keep trying to tell management about TCO....

    Then yuo'll need to clean all the projectors, £175 sounds about right, we've done a couple ourselves - it took us about 2-3 hrs using a bottle of isopropanol and some lint free cloths. Like promethean said, you'll need to change the bulbs as well so it might be best to sell em and buy new ones.

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    Re: Sanyo projectors - yellowing

    I heard it's the prism inside that needs cleaning or re-conditioning when this occurs due to the heat or light from the lamp. Our oldest projector sufferes badly from this and projects a large yellow area in the middle of the screen. I also heard you can go on a training course to get certified to clean them properly, or send them away for £60-£100 a time to get them done professionally.

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    Re: Sanyo projectors - yellowing

    I heard it's the prism inside that needs cleaning or re-conditioning when this occurs due to the heat or light from the lamp.
    It's the combination of heat and dust

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    Re: Sanyo projectors - yellowing

    Dont buy Sanyo again!

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    Re: Sanyo projectors - yellowing

    Thanks for that CyberNerd

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    Re: Sanyo projectors - yellowing

    I also had this with our Phillips lc 4433

    We got about 4 years out of them b4 it started, we have changed all of them this summer as in their 5th year some became unusable, we are now only going to use the Epson EMP 82 misco give us a good price.

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    Re: Sanyo projectors - yellowing

    Quote Originally Posted by CyberNerd
    This happens because the filters aren't being cleaned.....
    But they are though, thats my problem - what more can I do? Nothing, as I am "not allowed" to do it as it will "void the warranty".

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    Re: Sanyo projectors - yellowing

    Well I guess if they are being maintained as per manufacturers instructions then you have cause to return them, they are within warranty.

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    Re: Sanyo projectors - yellowing

    I had this with a NEC. They just swapped it out.

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    Re: Sanyo projectors - yellowing

    Quote Originally Posted by lordjimbob
    Quote Originally Posted by CyberNerd
    This happens because the filters aren't being cleaned.....
    But they are though, thats my problem - what more can I do? Nothing, as I am "not allowed" to do it as it will "void the warranty".
    You are cleaning all 4 filters on your projector?

    How blocked are they when they are cleaned, If they are really badly caked in dust I would suggest doubling your cleaning reigeme. If they are caked this will cause extra heat in the projector and the dust in the atmosphere will be pulled in from other non filtered areas of the projector.

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    Re: Sanyo projectors - yellowing

    Quote Originally Posted by drjturner
    Quote Originally Posted by lordjimbob
    Quote Originally Posted by CyberNerd
    This happens because the filters aren't being cleaned.....
    But they are though, thats my problem - what more can I do? Nothing, as I am "not allowed" to do it as it will "void the warranty".
    You are cleaning all 4 filters on your projector?
    Yup, all 4 at least every 2 weeks. They arent even dirty enough to merit doing every 2 weeks a lot of the time, but it is still done to maintain their condition - fat lot of good its doing!!!

    So again, cannot do anything more really. It's clearly a fault with the projector(s) and being fobbed off "it's dirty" isnt really good enough!

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    Re: Sanyo projectors - yellowing

    This problem has been spotted on several of the projectors here also which are all Sanyo. We have sent them to Promeathean for a full optical clean which I think was around the £175 mark, but they didnt come back any clearer then when they went to be honest.

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    Re: Sanyo projectors - yellowing

    Quote Originally Posted by CyberNerd
    First you need to get a maintenence schedute together to get the filters cleaned once a month or more regularly if needed. I keep trying to tell management about TCO....

    Then yuo'll need to clean all the projectors, £175 sounds about right, we've done a couple ourselves - it took us about 2-3 hrs using a bottle of isopropanol and some lint free cloths. Like promethean said, you'll need to change the bulbs as well so it might be best to sell em and buy new ones.
    We've got them in every classroom - we'd need extra staff for a cleaning regime like that!

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