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UPDATE: Dead Compaq Presario 1200XL Laptop/Notebook

Discussion in 'Electronic Repair' started by Brad, Mar 7, 2008.

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  1. Brad

    Brad Guest


    I found hundreds of postings regarding the Presario 1200XL series laptop
    with the same or similar problem as I have (see my original post below).

    It is my impression that one common cause of this problem is the flash
    bios going bad. It seems that somehow, there is a connection with a dead
    RTC/CMOS battery and flash bios!!! I replaced my dead RTC/CMOS
    battery (like many others did), but that isn't enough.

    I read several reports that stated the laptop was brought back to life
    after the flash bios was replaced, along with a new RTC/CMOS battery.

    My impression is the 1200XL series is a LEMON or this was designed
    into the system so the laptop last for as long as the RTC/CMOS battery?

    I am a TV, etc. service tech and I know that the contrast/picture setting
    from the factory is often set to maximum. The end result, this shortens the
    life of the picture tube, therefore reducing the life of the TV.

  2. Hi!

    I've heard that some motherboard makers programmed their NVRAM chips for the
    first time with "special" information that the board itself could not
    reset/restore if power were ever lost.

    I wonder if Compaq (or, more likely, the OEM that built it) decided that
    using battery backed RAM to store the BIOS was cheaper than a real ROM.

  3. w_tom

    w_tom Guest

    Your symptoms of no power are similar for maybe 100 different
    failures. So was that CMOS battery defective? Don't replace any
    battery without first measuring it while still attached. Having not
    done so, then 1) we don't even know is the battery was defective and
    2) can only wildly speculate that a battery has any affect on your

    No, flash memory would have no relation to the battery. How flash
    memory works would have made that obvious. Far more useful would be
    numbers such as from the main battery. Does main battery charge when
    AC power is connected (and computer is off)? Now we have useful
    information to understand what actually exists.

    Apparently power is getting into the system - indicated by a
    flashing light. Will system boot from battery? Is battery charged
    (another use for the meter)? Computer power from battery involves
    circuits different from AC power which are different from circuits
    that charge the main battery. Which circuit (may) have failed?
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