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Fans not working, power supply overheating...

My Pioneer 5030 CMX plasma has been displaying a green hue all along the upper portion of the display. The screen is really warm when this happens. So i did some searching, and I think the issue is the cooling fans are not firing up when needed. In fact the only time they function is for a brief 2 seconds when i shut the monitor off. The problem of the green hue only shows when the outside air temp is hot, which causes the display to run hot. I'm trying to learn my best course of action - is it the fans power supply, the chip/controller then starts/stops the fan, or something else? Thanks Jon

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  • jonvdb May 19, 2009

    The fan only works for about 1 second, when i shut off the power to the plasma display, it is as if it just got a jump start, then stops. The fan never comes on by itself when you think it should (hot days, long use of the monitor). So i agree it sounds like the sensor switch. Now that you have confirmed what I was thinking all along, i'd like to understand a couple of things: 1) Is this a switch a home customers could locate and replace? 2) Is there a test to determine if it is defective. I seem to recall that this Pioneer has a diagnostic mode, though i don't know how to trigger the display into that mode.

    thanks,

    Jon


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  • Pioneer Master
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The most likely cause is the fan temp sensor switch, if they work at all then the power supply is ok, look for a thermal sensor in the cabinet, it will be a thermistor with 2 wire leads to it, it will be connected to the fan power supply.

Posted on May 19, 2009

  • yadayada
    yadayada May 19, 2009

    If the sensor is seperate from the power supply it sjhould be easy to spot, u will need to remove the cabinet of the TV to find it, the fans power wires will come from the power supply. U will have to contact the parts manufactiurer to see if the switch is avail, i have no catalogs for parts.

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