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Thread: laptop display

  1. #1
    Registered User
    Join Date
    Oct 2004
    Location
    Bombay
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    laptop display

    Dear Friends,

    I have a compaq presario 900 laptop. I am in India.

    Some days back, I had forgotten to switch on the mains, so the laptop was on running on battery. I got busy elsehow. It must have gone into sleep/hibernation, and when I came back to my laptop, the display was off. I presumed it must have gone to hiberantion, so pressed the "on" button. But it did not start.

    It was quite late, so I went to sleep after putting the laptop off (pressed the "on" switch 5 seconds).

    Morning the laptop just wouldnt start.*

    There is an HP support telephone number, the person asked me to do a few things that did not work, and then he asked me to switch off completely, remove all cords, then remove the battery, and start the computer on AC main power. When I did this, the computer started, but the display was not working: I could make out a very dark image on the display, but it was very dark, couldn't read a thing.

    The Compaq repair station here has a bad reputation, so I took the laptop to a proper laptop repair station. They opened the machine, and told me that an IC, called .333T, which is on an invertor circuit which drives the display, has gone bad. They told me that the IC is not available anywhere, I'll have to change the whole invertor circuit. But the invertor circuit is not available. I would buy if the IC or the invertor circuit is available.

    Compaq fellows told me I have to buy the whole display+ invertor circuit, and a person associated with compaq service station told me they'll unofficially get me the invertor circuit, but they haven't yet come back to me.

    My questions:
    1. Do you think the diagnosis by the repairmen is correct, or something else could be wrong?
    2. If the diagnosis is right, where do I get the IC/ invertor circuit?*

    N. M. Havewala.
    [email protected]

  2. #2
    Laptops/Notebooks/PDA Mod 3fingersalute's Avatar
    Join Date
    Jun 2001
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    PA
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    3,880
    When an LCD is not lighting, it is because the backlight is not lighting up the screen. To verify this, shine a flashlight on the screen and you should be able to see the portion of the screen you are shining the light on. If the backlight is not lighting, you will need to replace either the backlight itself, or possibly the voltage board that supplies voltage to the backlight. In most cases, the light has just simply burned out, and can be replaced for a lot less than the whole LCD unit if you can find the parts and are willing to give it a shot. Do a google for replacement backlight + the model of your laptop, and you'll start finding some results.

  3. #3
    Registered User
    Join Date
    Oct 2004
    Location
    Bombay
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    laptop display

    Thank you very much, 3fingersalute.
    I shone the torch, but I cant see the display.
    Currently I am working on the same laptop and sending you this email: I have connected my old desktop's Display unit to the laptop.
    N. M. Havewala.
    [email protected]

    Quote Originally Posted by 3fingersalute
    When an LCD is not lighting, it is because the backlight is not lighting up the screen. To verify this, shine a flashlight on the screen and you should be able to see the portion of the screen you are shining the light on. If the backlight is not lighting, you will need to replace either the backlight itself, or possibly the voltage board that supplies voltage to the backlight. In most cases, the light has just simply burned out, and can be replaced for a lot less than the whole LCD unit if you can find the parts and are willing to give it a shot. Do a google for replacement backlight + the model of your laptop, and you'll start finding some results.

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