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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 again. Any suggestions?

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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. ( but for an overview: . 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 ( or 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.

Cindy Wells

Posted on Jul 27, 2010


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