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Compaq Armada 7770DMT

Discussion in 'Electronic Repair' started by Markus, Nov 22, 2003.

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  1. Markus

    Markus Guest

    I own Compaq Armada 7770DMT laptop computer. With AC power, it works
    perfectly but with battery it starts and after counting memory, power down.
    Power led starts flashing very fast. After that it does not power up at all
    until I remove and reinstall battery or attach power cord.
    Battery is full charged and functional. I have tested with other battery,
    same thing. Charging also works and Windows shows that battery is 100%
    Have anyone same problem?

    MN, Finland
  2. Andre

    Andre Guest

    Try replacing the CMOS battery?

  3. Markus

    Markus Guest

    Try replacing the CMOS battery?
    I checked cmos battery (7,2V 60mAh Ni-MH rechargeable). Voltage is ok, but
    something white stuff is coming out of it. I measured voltage coming to the
    battery when computer is on. It was about 18V, so it is not a miracle that
    battery is destroyed. So there is something on the MOBO.....
  4. mike

    mike Guest

    The 7.2V battery is the bridge battery. Not unusual to current charge
    'em. 18V open circuit is probably not a problem. 18V when the battery
    is connected and being charged means the battery is toast.
    I haven't had mine open in a while, but isn't there also a lithium CMOS

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  5. Markus Niemi

    Markus Niemi Guest

    Yes, charging is ok, voltage is 8-9V when battery connected. I noticed
    that when I connect the battery to the motherboard (without mobo
    powered), voltage drops from 7,2V to 5,94V.
    There isn`t other batteries. Only this 7,2V Ni-MH.

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