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codeMonkey
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Last Activity: 10-12-2010, 11:09 AM
Joined: 09-23-2010
Location: Germantown, MD
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  • codeMonkey
    replied to ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays
    Re: ViewSonic VX2255WMB White Screen Problem

    Alright,
    I guess it's time to through in the towel here. This is well beyond the scope of my knowledge and capabilities and there doesn't seem to be much to go on in regards to white screens.

    I'm going to sell this one for $25 plus shipping to who ever wants this for the power board and back lights and any other useful parts. Otherwise I'll just toss it.

    Thanks to everyone here for the help and advise.
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  • codeMonkey
    replied to ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays
    Re: ViewSonic VX2255WMB White Screen Problem

    I've checked EVERY single resistor on this monitor. I've come across 9 resistors that were shorted. However, I don't know the proper resistance measurements so if some one has the same monitor and can check I'd greatly appreciate it. There is I realize, a possibility that some of the resistors have to low a resistance for me to measure, but again I need some sort of confirmation. (I'm using a Mastech MS8268 DMM.) Picture 1 is of the video control card with the shorted resistors marked and picture 2 is of the LCD board that's attached...
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  • codeMonkey
    replied to ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays
    Re: ViewSonic VX2255WMB White Screen Problem

    I don't know if bammbammfran is part of this forum but he seems to be a pretty good tech based on reputation. I'm going to put everything back together and focus testing on the board mounted on the back of the LCD. I've been assuming that the issue is happening before that board but that may not be the case. I'll post an update tonight after testing the board. If anyone knows of a component besides the fuse that usually goes bad on the LCD board let me know. Here's what bammbamm had to say:

    f1 fuse on lcd screen board...
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  • codeMonkey
    replied to ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays
    Re: ViewSonic VX2255WMB White Screen Problem

    Good point. I'll have another go at it tomorrow. Thanks.
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  • codeMonkey
    replied to ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays
    Re: ViewSonic VX2255WMB White Screen Problem

    I've tested the video card itself with a dual setup (hdmi/dvi) and it works great. I think thus far the white screen problem has been the toughest thing I've tackled.
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  • codeMonkey
    replied to ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays
    Re: ViewSonic VX2255WMB White Screen Problem

    Ok, Caps on the video card and on the monitor boards tested good. The transform that I thought might be the problem tested good as well I think. (It would be replaceable by PN:2874014700 on lcdparts.net.) The other inverter also makes makes some odd sounds but I'm less inclined to think that's my problem now, but it could be. I did note what looks like a bit of corrosion in the attached pics. Any ideas on how to test this inverter?
    Outside of that I think I've tested pretty much every resistor, cap and diode on the monitor. The...
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  • codeMonkey
    replied to ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays
    Re: ViewSonic VX2255WMB White Screen Problem



    1) I haven't tested the monitor in a standalone configuration. A bit daft on my part perhaps. Using DVI.

    2) This monitor was used in a triple monitor setup. When I'd remove one of the other monitors for testing and all the monitors go black to adjust resolution properties this monitor will come up white screen (fuse F1 blown). This monitor and the other wing monitor have a resolution of 1650 x 1050 and the center monitor has a resolution of 1920 x 1080.

    3) ATI Radeon 4870 2GB. I haven't checked...
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  • codeMonkey
    replied to ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays
    Re: ViewSonic VX2255WMB White Screen Problem

    Thanks a ton Retiredcaps. I'll test the inverter as soon as I get home from work. I'll post results and pics (if applicable) afterwards.
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  • codeMonkey
    started a topic ViewSonic VX2255WMB White Screen Problem
    in Troubleshooting Computer Displays

    ViewSonic VX2255WMB White Screen Problem

    I've already recapped this monitor, but I then had a white screen. I found that fuse F1 on the back of the LCD was blown so I replaced it with a LittleFuse 1.5A 63V SMD fuse. Is this the correct amperage and voltage for this fuse? Once I replaced it the monitor worked fine. However, when an additional monitor is added and all the screens go black for a moment as the new configuration is set the fuse blows again and I once more am left with a white screen.

    My guess is that there is a spike that occurs (because of a bad inverter or perhaps transformer). I've tried to hit all specifics...
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  • codeMonkey
    started a topic Monitors
    in Albums

    Monitors

    Monitors, boards, schematics, and related parts.
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  • codeMonkey
    replied to New Members - please post your introductions here
    in Announcements & Related News
    Re: New Members - please post your introductions here

    Hi Everyone,
    I've fixed 10-12 monitors now for fun or profit (by profit I mean my wife made me sell them because I had too many... like that's even possible ). I have a Viewsonic VX2255WMB of which I think I've located the problem, but I don't know the specs of the part so I'm hoping to learn a bit more from the experts.

    I'm originally from Germany but have done quite a bit of traveling and am now living in the US with my wife and a little on on the way. I'm an embedded systems engineer, but an...
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