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Help identifying which pins to put power to!!

Discussion in 'Electronic Repair' started by Machi Smith, Oct 27, 2004.

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  1. Machi Smith

    Machi Smith Guest


    I have a NCR 5953-2000 12.1" LCD screen for a cash register. The case of the
    lcd screen states the monitor uses +12v DC/2.0A

    Now the actual power module it uses is similar to a PS2 connector, but I
    dont know which pins i need to connect power to... :(
    Ive tried to find a pin diagran for the PS2 connectors (in case it was
    standard) but I am unable to locate anything.

    Pictures of the unit are here on my webspace

    There seems to be 6 inputs, all i could think that maybe it used +12v -12v
    +5v -5v ? but its strange it didnt say this on the case.

    If anyone can help it would be greatly appreciated!!!

  2. Franc Zabkar

    Franc Zabkar Guest

    The ADM207EARS (U13) is an RS-232 Line Driver/Receiver which is
    powered from +5V (Vcc = pin11) and generates +/-10V from on-chip
    charge pumps. Hence, unless there is another device that requires
    -12V, I doubt that -12V would be supplied externally.

    There appears to be only one filter cap near the power connector (C77,
    10uF, 35V) which would normally suggest that only 12V, and ground, may
    be needed. However fuse F1 appears to connect to the Vcc test point
    and L19 connects to an input pin. This may be the +5V rail. Just to be
    sure, I would trace the 5V pins of U13 and U15 (93C46 EEPROM) to see
    where they go.

    At least two of the pins appear to go to one or more of the rear
    connectors via L20 and L21. It may help to follow the traces.

    - Franc Zabkar
  3. Guest

    What are you trying to accomplish? To be honest, these are pretty
    expensive to try to reuse as a generic lcd-display or to risk blowing
    up. Checkout these prices: 5953 12.1" Passive Matrix Color DynaKey/

    Perhaps eBay is in order? Might get enough to buy a nice 18" lcd.
  4. Machi Smith

    Machi Smith Guest


    I didnt realize they were worth so much.... I got 3 of them really cheap but
    with no power supplies....

    Ive since worked out how to power them up from the post above yours (Thanks
    Franc), and now i know you need special PCI-LCD cards to go with them which
    have power onboard via a mollex connector on the pci card itself.

    So... now Ive got to find one (or 3)...

    Thanks for all your help... and chris... I'll take your advice there i think

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