LE40A456C2D, no picture

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  • amennone
    Senior Member
    • Feb 2015
    • 61
    • italy
    #1

    LE40A456C2D, no picture

    Main -Board BN41-00980B
    Power BN44-00197B
    T-con T400XW01 V5
    Defect: Lighting o.k., audio o.k. no image, scart output image ok.

    The F01 fuse is blown, the cause is due to U101 = tps65161 broken. After replacing the U101, I have the following voltage values on the T-CON:
    AVDD = 15V
    VGL = -6V1
    VGMA1 = 15V
    VGH = 27V pin 1 of U103 = RT8901
    VGHC = 0V
    V1D8 = 1v8
    V3D3 = 3v3
    The VGHC is not present (output from pin 2 of U103 = RT8901). With the replacement of the U103, still no voltage
    VGHC.
    I gave 24v on the VGHC point, colored vertical lines on the screen, no image.

    Voltage measurements U103 = RT8901

    pin
    1 = 27V 8 = 0V
    2 = 0V 7 = GND
    3 = 0V 6 = 4v9
    4 = 3v3 5 = 1V

    I enclose the diagram of the T-con, even if it partially corresponds to that of the T-con in question.
    Thanks and good job.
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