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Monitor dont turn on

All elements on board are ok. but out put voltage for 5v is 3.9v and for 12v is about 14 volt.

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  • edris
    edris Apr 15, 2015

    thanks for your guidence. but i replaced supply board with new one the monitor work properly.it can't be from pannel i guess. what you think?

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Depending on the monitor, it may not be worth fixing, a power supply card or the video card is going to run you about $20-30 to get a new one and a price a old monitor that work is about the same with shipping.
How To Troubleshoot Problems My Monitor Died

Posted on Apr 28, 2015

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If your 5V line is that low, you either have a shorted capacitor or your backlight has failed and it shorting the HV supplying it.

I suggest looking at your back light at its ends to see if you see them as blackened.. this means the ignition coil in there has opened to make a spark (what makes it black). The 14V is probably OK. there is some fudge room on the 12 because it mainly drives peripheral items to the data (5v line).

Posted on Apr 13, 2015

Testimonial: "thanks for your guidence. but i replaced supply board with new one the monitor work properly.it can't be from pannel i guess. what you think?"

  • edris
    edris Apr 15, 2015

    thanks for your guidence. but i replaced supply board with new one the monitor work properly.it can't be from pannel i guess. what you think?

  • Stan Skaggs
    Stan Skaggs Apr 27, 2015

    I would still look at the bulbs in the panel.. something made the power supply die. You need to be sure the dead bulb did not drive the power supply to ruin. Just for sure look at it..

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Thank you for using Fixya. I am glad you have performed most of the testing for me :) Anyways the problem is definitely related to the T-Con also known as LCD controller or Timing CONtrol board. Replacing the same should resolve the problem. If you can get me the part number off the board, I can find you a replacement.

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To test the power supply try this:

Open your computer case and locate the gray box that is the power supply unit. Trace the wires from the power supply to the boards and devices and disconnect all the cables by unplugging them.

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Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

I could not locate any free sch for this model yet.

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1 Answer

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ok, your monitor problem is the inverter or lamps is not working well. you need do:
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hopeful all thing you can do it well
hope this help you fix it, please rating me thanks

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Here is a pin connection specification for the ac power supply (dual voltage adaptor)
>socket/plug for a Compaq TFT450 LCD Monitor that she
>supplied (edited for further clarity).
>
>The pins of the male connector (a PS2 mouse type connector) should be connected like this:
>
>
>
> 1 2
>
> 3 I 4
>
> 5 ^ 6
>
>
>
> GND GND
>
> 5V I 12V
>
> 5V ^ 12V
>
>
>
>For clarification - the male will be the end of your cable, and not the socket on the monitor.
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