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Philips LCD projector doesn't power up.

Discussion in 'Electronic Repair' started by Mark, Jun 6, 2004.

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  1. Mark

    Mark Guest

    I just bought this LCD projector for a song as it doesn't power up.
    Does anyone have a source for a service manual or schematic?

    It's a SV10 Hopper. Circa 1999-2000. The philips service organisation
    is pretty useless. I'm hoping there's third party support for this.

    I've done rudimentary checking on it to this point, There's a line filter
    on the input 120V that appears to pass voltage correctly, then a 120V to
    395V module, that appears to only be passing 365V, which seems like a
    pretty large variation. I'm suspecting bad/dry caps somewhere, but a
    pretty close inspection of the power supply boards doesn't show any that
    are bulging or leaking. Any ideas? Thanks.
  2. Art

    Art Guest

    Lamp, Lamp Driver [ballast], protect circutiry or devices.
  3. Mark

    Mark Guest

    Art wrote:

    I'm assuming, this is the order I should investigate in?

    I don't even get a fan when I try powering it up. I'm not
    sure how the lamp circuitry interacts with that.
  4. Art

    Art Guest

    If the lamp or ballast circuit is not functional it will shutdown, not
    allowing the cooling fans,etc to even see the power up sequence. Presumption
    is that you may have a protector device to the lamp or ballast circuit that
    has failed, if so then you probably need to replace both items to make the
    unit function. Cost of parts may precede your decision to purchase the lamp
    let alone the ballast.
  5. Mark

    Mark Guest

    Starting to sound like if it's not caps or something simple like that,
    it's a good parts machine for my other one? Bulbs are about $310.
    I don't think I'll even try buying a system board the size of the power
    supply. If I could even get it, it'd be far more than it's worth.
    It's a good basic machine, but not high end by any means.

    Can you point me in the direction of a good dissertation on metal halide
    ballast circuits? I don't have a single schematic on something like this.

  6. WDino

    WDino Guest

    Have you tried eBay for Service Manual?
    Some people have been selling CDs of various makes.
  7. Mark

    Mark Guest

    Hadn't tried that. When I did an ebay search for Philips projectors, I
    didn't find much at all.

  8. I have a philips made projector that had a similar problem. It was the
    bulb. What happened was it tried to fire (you could hear the HV arcing
    a few times) then it would quit. It sends a 2kV starting arc out to
    start the lamp, then 380 or so to run it. Check for the start arc. In
    mine there are three control wires going to the lamp ballast. One is on
    control, one is ground and one is start OK that is a signal from the
    ballast to the projector that the lamp started OK. In order to test the
    machine, I removed the ballast and bulb and replaced it with a simple
    overhead projector bulb temporarily and sent the lamp OK signal at the
    appropriate time. This allowed the projector to fire up and I could see
    the picture, although it wasn't as bright as with an HID bulb. Good

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