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HP/Pavilion Monitor schematic?

Discussion in 'Electronic Repair' started by Dave Shaw, Jan 21, 2008.

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  1. Dave Shaw

    Dave Shaw Guest

    I have an older HP Pavilion desktop (Model 9600) with an HP monitor
    (Model D7480A) that I really like. HP also refers to this as an S70
    monitor. The monitor's power supply just went bad, and with some time
    on my hands, I wanted to take a shot at fixing it. Anyone know where
    you can get a schematic for such a thing? "HP" seems to be the wrong
    answer...

    Note that I can't receive e-mail at the moment, so followups on this
    newsgroup, please.

    Thanks for any pointers.

    Dave
     
  2. James Sweet

    James Sweet Guest


    Schematics for monitors are very rare. I don't think I've ever had one, most
    of the problems though are not too hard to fix without one. Check for
    shorted semis in the power supply and horizontal scan section. Also look for
    bad electrolytic capacitors in the same areas.
     
  3. whit3rd

    whit3rd Guest

    Well, check the fuses first.

    A common feature of monitors is 'protection' which shuts
    down the power supply for any of a dozen reasons, which means
    a short almost ANYWHERE will shut the power off. It doesn't
    have to be in the power supply. So, best practice is to
    examine components that handle high power (which makes
    them high-failure-rate suspects), like capacitors (look for
    bulges or leaking from electrolytics), power resistors (the
    crispy black one? -it wants to be changed), and power
    semiconductors (heatsinked transistors and diodes).
    Wiring can also fail, look especially at connectors
    and heavy components for cracked solder joints.

    While HP may not have schematics available, you may be able
    to identify the controlling chips and look at the manufacturer
    data on them; a common practice is to build exactly the
    circuit that is Phillips/Samsung/National/SGS recommended
    application for that integrated circuit.
     
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