Projector Fault

Discussion in 'Projectors, Screens & Video Processors' started by gx600, Feb 13, 2004.

  1. gx600

    gx600
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    I have a fairly old ASK projector which has developed a fault. (see file sorry not very clear) All the images have a coarse lined shadow in differant colours. It was working OK when switched off and when switched on some weeks later (been away) this happened. The projector has not been knocked. Has anyone any idea what may have caused this and whether or not it is worth repairing.
     

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  2. Peter Parker

    Peter Parker
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    Hard to say, but from the picture, it looks like the green panel has possibly moved (I'm assuming LCD from the image).

    If not, what does it look like that with no inputs attached? I've seen some projectors do strange things when they have some leads attached without them being attached to a source, i.e the dvd player lead is attached to the pj, but is disconnected from the player. Make sure all leads are attached at both ends or not at all. With no leads attached, does the image still look like the pic?

    What does it look like when playing a dvd or image from a pc? Are all sources affected?

    Did the power go off when it was last used, so the unit had to cool down without the fan dunning?

    Hopefully we'll be able to see if it's a simple fault or not from your answers. I take it it's almost unwatchable due to the fault you mention?

    Gary.
     
  3. Spacecat

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    mind you its the perfect excuse to upgrade!
     
  4. gx600

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    Well first of all it is an LCD projector but it only has vga inputs and so I run it from a DVD drive in my pc.
    When an input source is applied the image is very poor as pic. Images have coloured shadows mainly green and purple. The shadows look like coarse lines. I have taken another pic. You can't see the coarse lines (on pic) but the purple shows.
    I have always shut down correctly ie fan running.
    You are correct to say its unwatchable. Especially for me as I like everything to be as good as I can get it.
    I don't know if I am imagining this but the colours of purple and green seem to also shine through the air vents in the projector and onto the wall behind it
     

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  5. Peter Parker

    Peter Parker
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    Does the pc play OK on a normal monitor? Just asking so we can eliminate the pc as the problem. It looks like the green has shifted, leaving the red and blue together to give the purple fringing. Not sure about the course lines though.

    If the purple line was made to line back up, would the image be normal again? It's hard to say without seeing it directly, but it still seems to me as if the lcd panel has de-laminated slightly - if that's possible.

    Gary
     
  6. gx600

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    Fault is definately with projector. Picture on pc monitor OK. If you see original post the screen is generated by the projector All images produce the shadows. If you look at the K in original pic you will see a purple shadow on the right and a green to the left. Both shadows are made up of coarse vertical lines.
    I undersrand what you are saying about the shadow lining back up but in truth I am not sure if it would be normal. I don't think that it would.
     
  7. Peter Parker

    Peter Parker
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    Apart from what I've already said, I can't think of much else right now. Hopefully someone else will have a few ideas.

    Gary.
     
  8. Daftboy

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    Why don't you get a cross hatch up to see if the panels are out?
     
  9. gx600

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    Sorry to be a bit thick but I don't know what you mean by cross hatch. Could you give me a bit more info please.
     
  10. Peter Parker

    Peter Parker
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    He means some kind of test pattern.

    You could probably knock up something on the pc in Paint or similar.

    Gary.
     
  11. davrob

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    The fault is the optical engine, in particular the green LCD panel. The optics and drive PCB`s are Epson EMP 5000 internals and is a very common problem with nearly all units failing at some point. Ive had lots of these machines in my workshop and all have to go back irrepairable. Problem was caused by very poor air flow through machine .

    Regards

    Dave
     

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