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seemore
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Last Activity: 01-24-2011, 07:08 AM
Joined: 03-09-2010
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  • seemore
    replied to Problems with Samsung 740N monitors
    in Troubleshooting Computer Displays
    Re: Problems with Samsung 740N monitors



    I've ordered and replaced those 2 mofsets. Still the problem exists, so i give up. I'll try to find whole inverter board, or if i don't find, i may try that solution with the LED strip - sounds very interesting ... i have a strange feeling all that will end with one broken monitor in the recycle bin
    ...
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  • seemore
    replied to Problems with Samsung 740N monitors
    in Troubleshooting Computer Displays
    Re: Problems with Samsung 740N monitors

    do u mean that we can transform every monitor into a nice LED display ?
    u will use something like this ?
    [url]http://www.dealextreme.com/details.dx/sku.5312[/url]
    Please make a post when u finish ... i think it will be great And will solve many problems with that inverters and lamps ...Re: Problems with Samsung 740N monit...sku.5312[/url]
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  • seemore
    replied to Problems with Samsung 740N monitors
    in Troubleshooting Computer Displays
    Re: Problems with Samsung 740N monitors

    Well i read the all thread once again, and i measured the 13V and 5.1V outputs. So the 5.1V is OK, but on the "13V" pin I have +18V. So I guess that I have the same problem like sequille and ethernet. I have some hissing sound too for 1-2 seconds, when the lamp is ON, after that the sound is off and the lamp goes off.
    Does anybody found what causes that symptoms ?
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  • seemore
    replied to Problems with Samsung 740N monitors
    in Troubleshooting Computer Displays
    Re: Problems with Samsung 740N monitors



    1305 Ohms on the right transformer, and 1235 Ohms on the other one....
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  • seemore
    replied to Problems with Samsung 740N monitors
    in Troubleshooting Computer Displays
    Re: Problems with Samsung 740N monitors

    Hello again,
    The resistance from Output 1 to Output 2 and from Output 3 to Output 4 is 1.3 kOhm. Is that OK ?
    The other measurements sound a little dangerous, and i'll ask someone else to make them, than i'll post the values
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  • seemore
    replied to Problems with Samsung 740N monitors
    in Troubleshooting Computer Displays
    Re: Problems with Samsung 740N monitors



    10x for replay.
    I tested the inverter with another lamp - it starts, and after a second it turns off. It's the same like the original lamp.
    I made a picture of the back side, but i don't think there is something unusual there - I've already re-soldered most of the elements.
    So how can i test BIT3193 PWM Controller, like another user asked before ? I can try to change it without testing - it's under $10 i think, but i'm not very good with my solder, and it would not be easy to change it ...
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  • seemore
    replied to Problems with Samsung 740N monitors
    in Troubleshooting Computer Displays
    Re: Problems with Samsung 740N monitors



    I've changed all the caps on the inverter, and re-soldered most of the other elements ... nothing happened.
    I'm pretty sure the problem isn't in the lamp - i tested it with another inverter and it works fine.
    So what to try next ? The fuse near the 3 caps is OK....
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    Last edited by seemore; 04-05-2010, 03:54 AM.

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  • seemore
    replied to Problems with Samsung 740N monitors
    in Troubleshooting Computer Displays
    Re: Problems with Samsung 740N monitors

    I have 740N with strange problem. First when I switch ON, i get image and backlight. After 2 seconds the backlight is OFF, and the image is OK, i can see it if i use flashlight.
    I can switch OFF/ON again and the backlight starts, but again only for 2 sec. I opened it, and saw the inverter board, but the caps looks OK. The fuse is OK.

    What would u say? Do u think i have to start with changing 3 caps, or all the caps ? Do u think the problem is in the Lamp itself ? Or the BIT3193G PWM Controller?
    It works for 2 sec...
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