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Compaq FP7317 flat panel monitor schematic HELP

Discussion in 'Electronic Design' started by Robert Baer, May 1, 2013.

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  1. Robert Baer

    Robert Baer Guest

    Need correct schematic for the FP7313 s/n CNN45248SR board PTB-1355.
    Only decent schematic available online is
    www.go-gddq.com/upload/2009-11/09112710434722.pdf and it is WRONG.

    CFL driver on this monitor is NOT a Royer..a 20-pin skinnydip drives FET
    switches from a 22.5V supply.
    Board designation is 6832135500-02 PTB-1355 11/01'04.
     
  2. Guest

    Google the skinny dip part number for a spec sheet to get an idea of what the ckt could be. If the lamps don't light up (power lamp blinking) then a.) look for the on board fuse from the primary regulator to the cfl supply. b.) substitute a working cfl from another display. play games to determine which one is bad as a bad lamp will keep the whole display dark. c.) I sawsomeone in S.E.R. rigged up a neon bulb with a bunch of (1 - 10) meg resistors to simulate same. Can't have too much lamp current OR too much/too little lamp voltage or it won't light up. Take note of the polarity of PWR GOOD from the main regulator and voltage levels off the other regulator ckts on the display processor board as they may be checked with a comparitor locally and temper the state of the PWR GOOD. Do you see an image if you shinea flashlight to the screen? Yes probably cfl supply problem.
     
  3. Robert Baer

    Robert Baer Guest

    * Numbers on part (3 lines):
    OZ960D
    0432B1
    V44502.4

    So, please let this ignoramus know name of manufacturer ns the part
    number.



    of what the ckt could be. If the lamps don't light up (power lamp

    blinking) then a.) look for the on board fuse from the

    primary regulator to the cfl supply. b.) substitute a

    working cfl from another display. play games to determine which

    one is bad as a bad lamp will keep the whole display dark.
    * The transformer that drives the CFL has only one winding for primary,
    driven by FETs from existing 22.5V supply (so fuse is OK), but no signal
    to gates of the FETS; the 20-pin skinnydip has no measurable voltage on
    any of the pins - making parts in that area suspect.
    Too much complexity in that area for reasonable quick "schematic"
    scribble from layout.

    c.) I saw someone in S.E.R. rigged up a neon bulb with a bunch

    of (1 - 10) meg resistors to simulate same. Can't have too much

    lamp current OR too much/too little lamp voltage or it won't
    * with no drive to the CFL xfmr, this seems useless.

    light up. Take note of the polarity of PWR GOOD from the main
    * ??power good?? this is not a (shrunken) PC supply in the flat panel
    monitor.

    regulator and voltage levels off the other regulator ckts on

    the display processor board as they may be checked with a

    comparitor locally and temper the state of the PWR GOOD.

    Do you see an image if you shine a flashlight to the

    screen? Yes probably cfl supply problem.
    * Image can no longer exist, as i ripped out the LED/polarizer matrix
    "sheet" and its drivers; all i am looking for is a nice diffused light
    source.
    Have done this before with great success, but those used the standard
    12V supply Royer CFL circuit (they also did not initially work, but
    logic was easy to fix).
     
  4. Guest

    Bob,
    I'm late to the party as usual.... I googled >> OZ960D <<< and lo and behold >>> OZ960D datasheet | Pinouts | Circuits | Schematic for Intelligent Ccfl ...
    www.dz863.com/datasheet-8380551663-OZ960D_Intelligent-Ccfl-Inver...

    The thing is made my O2 Micro Page 2 of the pdf shows example 8-22v application circuit. You might find it is the same as on the board. When I workedon video displays, I was amazed at all the cards based on the same reference design but with slightly different eprom contents to tweak their performsnce. Don't ignore the enable pin/
    From your further description it seems you are trying to make an X-ray film viewer?

    good luck
    al
     
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