Question about BenQ FP71G 17" LCD Monitor

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Our computer screen will stay on for one second and then go black. Green button to signify it's on, is still showing, it simply goes black. What is happening and how can I fix it?

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Sir if u really love your computer, then take it to the nearest dealer. The problem is might be with the capacitors.

But my suggestion hence, is to isolate the power board (the one that has the socket for the power input), check if any of the capacitors (the tall cylindrical structures) have bulging tops, if they do, try to replace them (Novices please bear the polarity in mind when you play with capacitors) with ones with higher rated ones (especially the voltage rating, normally these would be rated for 25 volts, so try getting one that is one step higher.

Posted on Feb 27, 2010

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  1. Check to make sure your monitor is on! Some monitors have more than one power button or switch - check to make sure they're all switched on.
  2. Check for disconnected monitor power cable connections. Your monitor might be working fine and your only problem may be a loose or unplugged monitor power cable. Note: A disconnected monitor power cable could be the cause of your problem if your monitor's power light is completely off.
  3. Check for disconnected monitor data cable connections. Again, your monitor might be turning on without a problem but no information can get to it because the cable that connects your monitor to your computer is disconnected or loose.
    Note: A disconnected monitor data cable could be the cause of your problem if your monitor's power light is on but is amber or yellow instead of green.
  4. Turn the monitor's brightness and contrast settings completely up. Your monitor might be showing information but you just can't see it because these display settings are too dark.
    Note: Most monitors today have a single onscreen interface for all settings, including brightness and contrast. If it turns out that your monitor isn't working at all then you'll likely not have access to this interface. An older monitor might have manual knobs for adjusting these settings.
    1. Test that your computer is working correctly by connecting a different monitor that you are certain is working properly to your PC. Your monitor may be working fine but your computer might not be sending information to it.
    2. If the new monitor you connected does not show anything either, proceed to Step 6.
    • If the new monitor you connected does show information from your computer, proceed to Step 7.
    1. Important: When testing with the new monitor, make sure you use the data cable that came with it and not the one from your original monitor.
    2. Determine why your computer isn't sending information to your monitor. Since neither monitor works, you now know that the computer is not sending information to the monitor. In other words, you've proven that your computer is the reason that nothing shows up on your monitor.
      Chances are your original monitor is working fine.
    3. Test your original monitor with a monitor data cable that you know is working. It's possible that the monitor itself is working properly but it can't receive information from the computer because the cable that connects the monitor to the PC is no longer working.
      Note: If possible, test using the data cable from the monitor that you successfully tested with in Step 5. If not, purchase a replacement monitor data cable to test with.
      Note: The data cable on some older monitors are permanently connected to the monitor and are not replaceable. In these cases, you'll have to skip this step and proceed to Step 8.
    4. Replace the monitor.
      WARNING: A computer monitor is not a user serviceable device. In other words - do not open the monitor and attempt to repair it yourself. If you would rather have your dead monitor serviced instead of replaced then please let a professional do it

    Posted on Feb 27, 2010

    • Technicalwis Aug 21, 2011

      Hi Chaps more likely failed Parts in the Inverter circuit, (2SC5707,s) due to poor soldering on the inverter coils, this can sometimes blow the fuse as well, but you would not see it for one second if this was blown, Or it could be faulty backlight, these can be repalced but is a very long and tedious job. Cheers

    • Anonymous Sep 07, 2011

      The problem is likely to be the backlight - either the inverter is faulty (often the high-voltage capacitors in the output circuit) or the tubes have aged and their current draw dropped below the arbitrary minimum set in the inverter circuitry.
      The HV capacitors could be checked & replaced. If they are OK then either new tubes could be fitted, or the minimum current-limit disabled.



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