DVI issues, Rev J and L

Discussion in 'DM800HD Schematic drawings, Pcb images etc..' started by Johnny B., Jun 11, 2015.

  1. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Test with a monitor connected at Dvi.

    2201.jpg



    DVI Rev J Pcb,
    DM800HD-dvi.jpg


    DVI Rev L Pcb,
    DM800HD-dvi-rev-l.jpg


    DVI Symptoms.

    1. When you connect a monitor or tv screen on the Dvi port the box failed to start, or sometimes start when you turn Off, and On the box several times.
    Solution could be the replacement of the U18 - TL7702 ic which can be checked if you measure with the + probe/pen from your measuring device on the pin 5, and the black probe to the ground.
    If the box reset when you touch the pin 5 (reset), it's okay.
    If not, replace it.

    2. DVI not working, but when you also connect the Scart than the dvi works also.
    Solution is a bit tricky because it may caused due one of the the four RGB/C caps or the function switching transistors Q1/Q3 or diode transistor D11.
    But in some cases it may also be caused due the chosen software.