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Hi, my hp montior has started to become blurred.

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  • kane88 Oct 31, 2008

    my monitor is an HP w19b/w19e wide lcd monitor and is only 2 years old. is there another soultion as to why things are going blurred regards kane88.

  • kane88 Nov 03, 2008

    thank's for the quick responce.

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  • Master
  • 6,966 Answers

Hi,

Assuming that your HP monitor is conventional CRT type and thatno hardware/component fault, the dimness of a monitor signifies near end of life of the CRT (tube).

There are a few tricks/tweaks that can be done but of course these are just prolonging the inevitable. Additionally, this would require experience (not only familiarity) working with high voltage circuitries. Should you want to give any of them a try, they are:

  • Adjust the Screen controller at the rear of the Flyback Transformer (FBT) to maximum effective brightness. It may also be needed to adjust the Focus control;
  • In some versions, there are sub-bright and/or Automatic Brightness Limiter (ABL) trimpots soldered direct to the PCB that can be adjusted;
  • the heater voltage can be slightly increased either by using a stepdown transformer that has multiple taps about 1~2 amps. In some instances, the heater has an external loop around the core of the FBT, adding a turn or so would also serve the same;
  • adding a 100uF/160V capacitor after the diode of the FBT's output that supplies the B+~70VDC of the 3 color drive transistors.
Again, all of the above require experience and knowledge of electronic components and circuitry, use of a soldering iron and working around high voltages. If you are not comfortable going through this route, perhaps your best bet would be to seek the services of a qualified professional.

If your concern has not been corrected after completion of the above procedures, you may need to replace the monitor.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FIXYA.

Posted on Oct 30, 2008

  • Louie  Role
    Louie Role Oct 31, 2008

    Hi again,

    Appreciate you correcting my assumption.

    There would only be two areas in an LCD monitor that would account for your concern:


    • CCF (cold cathode florescent) lamp is getting weak or the inverter powering them is producing insufficient power; and/or

    • video driver board (main board).
    Although there are instances when the main power supply is the issue where the boards are getting lower than the regular power and produces several faults including the blurring.

    Initially, I would suggest that the unit be opened up for a look and see. Common culprits on most LCDs that we have worked on involve dried up or blistered capacitors that would exhibit a variety of symptoms/faults. Of course extreme care as the inverter produces a high frequency high voltage power for the CCF Lamps.

    Cheers.


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