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CRi
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Last Activity: 06-29-2015, 08:51 AM
Joined: 11-30-2014
Location: Liège
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  • CRi
    replied to Samsung 226BW
    in Troubleshooting Computer Displays
    Re: Samsung 226BW



    Damn, I had already watched that video when Dave released it, but I didn't have a scope at that time... you were right, I was measuring it all wrong



    So now I used the springy ground lead, set my probe to 1x, bandwith limit to 20mhz,...

    The results are much better

    Seeing that this problem appears only when no video signal is present, I think I'll just leave it that way... I guess it's a problem with the replacement driver board but that's no big deal....
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  • CRi
    replied to Samsung 226BW
    in Troubleshooting Computer Displays
    Re: Samsung 226BW

    I recently bought a Rigol DS1054Z so I tried to measure the 13.5V coming from the power supply. I'm a scope noob so forgive me if I'm wrong...

    The power supply seems awful to me, very badly filtered.
    It seems to have more than 1V ripple !

    See attached screenshots (always the same signal, but different zoom settings).

    I already changed most of the electrolytic caps on the PSU, it wouldn't start without that.

    What do you think?...
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  • CRi
    replied to Samsung 226BW
    in Troubleshooting Computer Displays
    Re: Samsung 226BW



    I finally got a little bit of time to try and repair this monitor

    So I checked in the device manager and it is recognized as "SyncMaster 226BW". Edid Viewer Utility is able to read all EDID information.

    If the BIOS is corrupted, is it possible to flash it? Or maybe swap the eprom of both controllers?

    Does the eprom contain information specific to the panel? Mays both controllers come from different panels and therefore contain incompatible information?...
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  • CRi
    replied to Samsung 226BW
    in Troubleshooting Computer Displays
    Re: Samsung 226BW

    I have heated the logic board, but that did not fix the problem.
    Sometimes the line pattern changed but it never disappeared.

    I don't have a can of compressed air to cool it...

    It's really strange that it only appears when it has no signal, isn't it?
    If the main chip need to be reflowed, wouldn't the problem be present all the time?
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  • CRi
    replied to Samsung 226BW
    in Troubleshooting Computer Displays
    Re: Samsung 226BW

    Here are the pictures of the controller.

    Sorry for the quality, it's not easy to take good macro pictures without proper lighting

    I have a cheap rework station, I can try to heat the board. What should I do? Heat it then plug it, or heat it while powered on??

    Do you want pictures from the power supply too?...
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  • CRi
    replied to Samsung 226BW
    in Troubleshooting Computer Displays
    Re: Samsung 226BW



    The menus are working, I tried "Image reset" and "Color reset" but it didn't fix the problem. I didn't find a "factory reset" menu.

    I had a change to try the VGA input and it's working too.

    So I guess it's no big deal ...
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  • CRi
    replied to Samsung 226BW
    in Troubleshooting Computer Displays
    Re: Samsung 226BW


    Maybe I wasn't clear but it works fine when it has a signal on its HDMI input. Those strange patterns only appear when it ha NO input signal.

    I know this is a minor annoyance, it appears on once at each boot, but if it is simple to fix I would prefer to do it :-)...
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  • CRi
    started a topic Samsung 226BW
    in Troubleshooting Computer Displays

    Samsung 226BW

    Hello,

    I have a problem with my Samsung 226BW.
    The display stopped working, the power led would not turn on.
    I opened the monitor, and surely enough, the 6 big caps on the power supply were blown (5x 820µf, 1x 330uF).

    I replaced them with new panasonic caps and the PSU came back to live. Sadly, the controller board was toast... I ordered another controller (same model) and replaced it.

    The display is now working with a HDMI signal (I couldn't test the VGA input as I don't have a cable on hand). But when it has no input signal, it displays a strange...
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  • CRi
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

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  • CRi
    replied to Samsung 226bw dead. No power
    in Troubleshooting Computer Displays
    Re: Samsung 226bw dead. No power

    Hello,

    I'm facing the same problem with my Samsung 226BM.
    The display stopped working, the power led would not turn on.
    I opened the monitor, and surely enough, the 6 big caps were blown (5x 820µf, 1x 330uF).

    I replaced them with new panasonic caps but that doesn't seen to have fixed the problem...
    I didn't replace the small caps but they are fine (I checked them with an ESR meter).

    Here are the measurement I took.

    [U][B]PSU board.[/B][/U]
    [B]CN2[/B][LIST=1][*]B-DIM:...
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