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LCD monitor, white screen with vertical lines

Discussion in 'Electronic Repair' started by Mac, Mar 16, 2006.

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  1. Mac

    Mac Guest

    Hi folks,
    I have a BenQ 567s V2 LCD monitor that is non-functional. It powers up but
    the only picture I get is pure white with vertical red and blue lines.
    While booting, however, I was able to read some of the on-screen text but
    it's always fairly white. I disassembled the unit (observing all
    precautions) but didn't find any loose connections.
    I had sold the unit in working order but the buyer found it in this state
    after shipping. It was well packed with gobs of bubble-wrap. I had him
    ship it back. There are no signs of abuse inside or out.
    Any thoughts?
    Thanks,
    -Mac
     
  2. Mr Fixit

    Mr Fixit Guest

    daft question is it the same one as you shipped to him??
     
  3. spudnuty

    spudnuty Guest

    Did you disassemble the display all the way down to inspect the
    connections onto the display itself? or the display driver board? I
    just worked on a Compaq laptop with LCD problems and the flex cable had
    just popped off the display driver board in a number of places. It was
    a soldering problem because I tested some of the components on that
    same board and stopped because they would just pop off under the
    slightest pressure.
    Richard
     
  4. Mac

    Mac Guest

    Yes, same unit. Sorry if I confused everyone.
     
  5. Mac

    Mac Guest

    I stopped just short of removing the panel from it's metal frame. I could
    see the back sides of the FFCs, where they attach to the pcb, but not where
    they connect to the panel. They looked prestine on the back so I didn't go
    any further. Time for more disassembly.
    Thanks,
    -Mac
     
  6. Mac

    Mac Guest

    Okay, complete disassembly. FFCs look okay, at least with visual
    inspection, on both ends (panel and controller board). Visual inspection of
    controller board looks okay, not that just looking at it will tell me
    anything. All ribbon cables, etc, are tight and look good.
    Okay, I think the conclusion here is that one of the boards got fried. How
    could this happen during shipping? I don't see any cracks in any of the
    boards and the housing looks fine. Could the buyer have hooked it up wrong
    or trashed the unit with the wrong refresh rate or something along those
    lines?
    Thanks again
     
  7. Dave D

    Dave D Guest

    I'm not sure if you get what he's saying, so my apologies for mentioning it
    again- is it possible the buyer had an identical bad monitor and ripped you
    off by keeping your good one and sending his duff one back? This
    unfortunately happens on eBay- people look for someone selling a good item
    identical to a faulty item they have, then try to return their own garbage
    to the seller and demand a refund.

    They might even go as far as to swap out the insides so on the exterior
    you're getting the right monitor back with the correct serial number, but
    the wrong innards- there's just no way of knowing now.

    The only way to deal with this is the note the serial number of any
    electrical items you send out, and if possible make the item tamperproof so
    you know if they've opened it, ie by getting some labels made up to stick
    over the screw holes, or filling one of the screw holes with wax.

    It seems very suspicious to me that it worked when it went out, and came
    back faulty. I doubt it could have been damaged in transit- the glass is the
    most fragile part and that is intact so I have a feeling you've been 'had'.

    Dave
     
  8. Dave D

    Dave D Guest

    No, the wrong refresh rate won't damage a TFT monitor.

    Dave
     
  9. Mac

    Mac Guest

    I'm not sure if you get what he's saying, so my apologies for mentioning
    Man, I never would have thought of that! I guess my mind just doesn't work
    that way.
    Actually though, I did get the same one back. It has a tiny spot on the
    screen in the lower right hand corner that looked as if someone had tried to
    clean it and was a little too aggresive. It's only noticable when the unit
    is off and the light is just right, but it's there. So unless he swapped
    the anti-glare...
    Well, short of having a donor for swapping parts, this ones a gonner. Oh
    well, live and learn.
    I do agree though, doesn't seem like a board could go bad in shipping,
    unless they stacked it on an operating Tesla Coil!
    Thanks for the help,
    -Mac
     
  10. Mike Berger

    Mike Berger Guest

    There can be a lot of shock stress in shipping. It's not that unusual
    to find problems occasionally with rough handling. Packages are often
    tossed onto piles or conveyers.
     
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