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Monitor on a 400 vtx gateway

My scree is dark You can hardly see what's in it. I purchase a inverter board and I replace it. For a couple of minutes the monitor works fine and then it goes back to the original problem witch is dark and hard to see what's in it. Any suggestions. Is it a light bulb that I may need to replace also.
Thanks

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  • vanina Apr 29, 2008

    thanks

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Check the output voltage of the invertor board , if its 150 volt (point of cold fusion lamp connection) then the drive electronics of the invertor board from the motherboard is damaging the new invertor boards which you are trying to replace. Check input to the invertor board it should be 5 Volts and 12 volts .

Posted on Apr 30, 2008

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I HAVE A HP DV2000 LAPTOP WITH VIDEO ISSUES , I REPLACED THE MOTHERBOARD BUT STILL NO PICTURE ALL LIGHTS ARE ON AND THE FAN IS WORKING BUT NO VIDEO..


Hook a spare monitor to the video output, usually on the back. If you get a picture it means the inverter board is bad, or the backlight behind the LCD display, check to make sure the round video cable is plugged into the motherboard. But, if the symptom is the same for both screens, the problem is the Video Graphics Card normally built into the motherboard. If the connector to the LCD is damaged that would explain the issue of no video.

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In my experience, if a back light goes out, it doesn't work at all. Since yours works for a short time before going dark, I'd say that it's your inverter that's faulty.

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I have a CTX s761 lcd monitor. The image on the screen will be clear for about a minute, then it gets very dark and can only see a ghost of the image. Power off and back on and it does the same thing...


It's a backlight issue. (The backlight itself usually fades or makes the on-screen image change to pink/red.) With a bad backlight, you'll usually see a very dim image if you look at the monitor from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something).

The backlights are sandwiched on the perimeter of the monitor (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your monitor size. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. (http://www.lcdparts.net/howto/default.aspx) but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx . lcdparts.net sells backlights for some laptops and monitors. There are other sources.

The inverter board or the video board can also fail but you usually won't see any image when those fail. For an out of warranty monitor, open up the back of the unit and remove the shielding. Then look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.)

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the board and power up the monitor. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

With a good spare backlight, you can test an inverter for condition (plug together and turn on the monitor while the box is open). Similarly a good inverter can test the backlight. If the inverter or video board is bad, you will see nothing

I hope this helps.

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If you opened up the case and can see the board, you generally have to remove all the stuff--connectors, modem, hard drive, CD, etc.
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To Jaffe: It's a simple job to remove the hard drive from your laptop and hook up to another computer to copy anythig off that you want to keep. I don't know what a shop in your area would charge, but it should be reasonable. As for replacing the system board, a quick Google search for "MX6448 motherboard" turned up several sources, price range $250-$300. Usually it's not worth putting a new system board into a laptop unless it's a very high-end model. You can buy basic laptops now for around $400, and you'd be getting brand-new with a warranty.

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Connecting monitor to gateway 400 vtx laptop


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You can fix this problem simply by pulling the computer out, then looking for a blue vertical port (if you don't have a graphics card) or a blue Horizontal port (if you do have a graphics card, which is usually located at the bottom of the computer.)

Count the pins on the cable then count the pins on the port.

The end of the monitor cable should be Male which are pins only and the port should be Female which are slots where the pins go.

Make sure that the sides of the cable matches the sides of the port (which is a upward angle)

If you have anymore problems please let me know,

-Daniel.

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