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HP Laptop Screen Problems

Discussion in 'Electronic Repair' started by itsme, Oct 4, 2004.

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  1. itsme

    itsme Guest

    I have a HP Pavilion N5440 laptop. I have been having a problem with my
    screen. It seems like the hinges are loose or something. The screen will
    flicker or go black. But if I prop it against the wall it will stay on. So I
    feel like the connection is loose. Can someone tell me if this can be easily
    repaired at little cost? I fear if I bring it into CompUSA they will tell me
    I need a whole new screen, which will be the cost of a new laptop. The fact
    that the screen works all the time except if I move it away from the wall
    makes me think the screen is fine.
    I appreciate any advise.

  2. Bob Shuman

    Bob Shuman Guest

    Sounds like the connection from the inverter to the backlight is loose,
    although it could be the connection to the inverter or at the backlight as
    well. I've replaced the inverter on a similar vintage of HP unit and it was
    not too difficult to get to if you are handy and have a set of precision

  3. itsme

    itsme Guest

    How much was the inverter? Where could I find the tools needed and what do
    they cost? Or should I chance giving it to CompUSA or another repair
  4. Andy Cuffe

    Andy Cuffe Guest

    It sounds like the cable that connects the screen to the motherboard
    is failing. They frequently develop cracks after several years of
    flexing each time the lid is opened or closed. It can be a pain to
    replace, but won't require a new screen. If the screen goes dark, but
    you can still see the image when you shite a bright light at the
    screen, then it's the cable to the back light inverter. If the screen
    still prodused some light, but goes blank it's the cable to the LCD.
    Andy Cuffe
  5. Bob Shuman

    Bob Shuman Guest

    I found an inverter for about $45 IIRC. I called around to a lot of
    different places, including HP and some of the larger electronics repair
    places who said they would not sell the inverter and only offered to ship
    out the unit for replacement of the LCD at about $700 IIRC. When I did find
    a few places that would sell just the inverter I remember getting quotes for
    that part alone that ranged to $150 (over three times the amount I paid). I
    also recall finding a web site that offered "refurbished inverters for under
    $50. You can actually use Google to find these by typing in the
    manufacturer and part number that is stamped on the inverter. (Mine was
    made by Ambit, but I don't recall the part number and yours is likely
    different anyway.

    In the end, after making several calls, I found a local "no-name" computer
    repair depot that was willing to order me the part and tacked on a
    reasonable service fee instead of selling the part retail.

    Good luck. The fact that your unit stops and restarts with physical
    positioning seems to indict a cable or connection and probably not the
    inverter. In my case, the unit started taking longer to light and
    eventually died completely. You could tell it was the backlight because the
    text/graphics were still being displayed and could be seen changing by
    holding the unit up to a light source that reflected off the glass at the
    right angle. It has been working fine since the inverter was replaced.

  6. itsme

    itsme Guest

    Can the cable alone be replaced? Or do I have to purchase additional parts
    to get the cable?
  7. Andy Cuffe

    Andy Cuffe Guest

    I don't know about hp, but I once bought a cable for an IBM. It was
    about $30 and included the LCD cable and backlight cable. Have you
    checked ebay? A lot of laptop parts seem to end up there.
    Andy Cuffe
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