Question about ViewSonic VX910 19" LCD Monitor

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VX924 - powers on steady green with display illuminated but lasting only 2 seconds then black. I have changed all the electrolytic caps even the large one on board type FSP035-1p101 P/N3BS006431 but problem persists. When I shine a torch onto the screen I can see the display albeit faintly so I presume the logic board itself is OK (no sign of suspect caps) so what else could I change on the power/inverter board? I assume the backlights themselves are OK as the display does illuminate albeit for 2 seconds.

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  • admin29429 Nov 13, 2010

    Thanks for the prompt response - I'll give it a go, but do you think there would be such a heat build up in the two seconds from power on from cold to black display to give this problem? i was wondering if there was a problem with one or more of the ceramic capacitors, diodes, resistors or transistors on the board? Is a spec available for the various components on the board so that if needed and where possible I can test first and then replace? as i would rather solder once rather than keep removing the board.



    Keith

  • admin29429 Nov 13, 2010

    Thanks. Can you say what ics stands for? - is that the integrated circuits on the PCB board itself? I am happy with the power supply as all of my other IT kit is OK.



    Keith

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Since you have already changed all the electrolytic capacitors, the next step is to fix the connections that the metallic surfaces used for heatsinks have to do. Locate one by one these metallic heatsinks, turn the board upside - down and use a simple isolated cable to join the copper points that the heatsink connects using a soldering tool. At many cases these connections are very unstable since the heatsinks are getting hot. Use pieces of cables to make these connections secure.

In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, accept my solution.

Thanks and regards
Stelios
direct fixya link: http://www.fixya.com/users/technical114

Posted on Nov 13, 2010

  • Stelios
    Stelios Nov 13, 2010

    Since you have already replaced all the el. capacitors, the posible problems could be: heatsinks - shortcircuits, ics and transistors. At most of the cases that came to my lab the problem was at the capacitors, or cold contacts on the board; never at the ceramic caps, never at the resistors (by the way check in case there are some power resistors). Another one possibility is the power supply itself, if it's an external one, but this is easily to be measured, on load.
    I'll try to lacate a schematic at my data in order to post you back, but I don't think you'll need this.

    In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
    If you are satisfied, accept my solution.

    Thanks and regards
    Stelios
    direct FixYa link:http://www.fixya.com/users/technical114

  • Stelios
    Stelios Nov 13, 2010

    I've never came up with a faulty ic (integrated circuit). I don't think that you will be more lucky that I am...

    In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer, I'll be on line for 2 more hours.
    If you are satisfied, accept my solution.

    Thanks and regards
    Stelios
    direct FixYa link:http://www.fixya.com/users/technical114

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