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Can someone help me? problem with driving RGB screen

Discussion in 'Troubleshooting and Repair' started by turboturbine, Jan 31, 2013.

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  1. turboturbine


    Mar 22, 2012
    Problem Agilent 4195A network analyzer RGB display

    I have a problem, I bought a HP 4195a network analyzer from italy.
    With transport the back of the CRT tube is broken off, It is a sony crt, they are available on ebay but they are quite expensive 300-500 dollar(and even not new then)

    I am angry now why this happaned to me now, I have enough things at my mind now.

    I looked at the schematics and at the flat cable who connects the display unit with the computer board.

    It is a a 26 connection flat cable the connections are.

    R1 GND
    R2 GND
    G1 GND
    G2 GND
    B1 GND
    B2 GND




    And there are two connections for power 0 volt and +51 volt

    I was thinking to buy a 7" RGB tft display or a 7" composite display, there are also RGB to composite converter I see.

    My questions are: does someone have a idea why there are two lines for each color?
    Last edited: Jan 31, 2013
  2. turboturbine


    Mar 22, 2012
    I did not have had the time to look at the chematic properly some hours ago.(I soon have to make a decision what I am going to do before someone from the postal service takes a look at it)
    I have looked at it now.
    It is more complicated then I tought, the two wires per color are for 4 brigtness levels, all the circurtry in the display unit is analog, first there is a circuit that converts the signals from those two lines into 4 levels of brigntness and then it gets amplified and fed to the crt itself.
    The voltages are quite high too, like 100 volts when high.

    So I think it is easyer to get another crt, I think it is quite a pitty, a TFT screen will not be a punishement.

    Stupid there is no monitor output on this unit while others both older and newer have it standard or as a option.
    Last edited: Jan 31, 2013
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