Question about Compaq Presario 700 470024-192 Notebook

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Compaq presario c700 laptop no light on lcd screen after cleaning

My kid spayed cleaner on my laptop lcd screen while it was on now the lcd is on and can be seen with a flashlight but is otherwise dark i have already tried to adjust the screen brightness using function F7/F8, and hp customer service had me update/reflash the bios, as well as restore windows to factory original settings with no success, so it seems definitly hardware related. It works fine with an external display.

i have not opened it yet so is there replacable bulbs, is the lcd bad, or is there another controller card for the lcd that may be bad or is it all included in the replacement lcd?

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The display is backlit by a fluorescent lamp, not bulbs. The cleaner sprayed onto the screen has likely migrated downward and either disabled or destroyed the inverter used to produce high voltage for the backlight lamp. The inverter may be part of the display or on a separate board and you can only determine that by some disassembly.

Posted on Jan 25, 2009

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Well it seems like your backlight is shot. I cracked my HP LCD and when I went to the HP Support website to chat online with a tech he gave me an outrageous price for a new LCD(~$800). After I told him I could get a new one on Ebay for ~$120 he sent me a link for the actual shop manual detailing how to remove the old LCD and replace it.

Posted on Jan 25, 2009

  • Mike
    Mike Jan 25, 2009

    The bulbs are in the LCD itself. As for the power inverter it is a separate board located just below the LCD

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You have likely shorted the lcd. the only cost effective solution is to purchase a replacement lcd which will replace all required parts for it.

Posted on Jan 25, 2009

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