Question about Dell 19"" 1907fpt dvi rotating lcd monitor w/usb 2.0 hub silver/black

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Dell 1907fpt Have the same problem as other posts here. Screen comes on for a few seconds and then turns off. Heard an electrical arcing in the back and found the problem, the backlight wire had been cut into by the metal frame. fixed the arcing problem but the screen still turns off after a few seconds. None of the solder joints appear bad and the capacitors are working fine. Can anyone help me figure out what else it could be?

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  • 40 Answers

Its fried. too bad

Posted on May 09, 2013

  • marij420a
    marij420a Jun 01, 2013

    The power source works fine. The back lights work fine. The problem is somewhere in the circuit board on the LCD panel it self. What component will cause it to come on until warmed up then shut off. when first turned on it stays on for a sec longer than after it shuts off and then turned back on.

  • marij420a
    marij420a Jun 01, 2013

    I have a replacement from an earlier model of the same monitor. I have components available to use from that one, tried putting the panel into the back light and case for the other screen but same problem of coming on then shutting of occurs

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

SOURCE: I have a Dell monitor model #1901FP when my

The solution I am about to describe refers to a backlight problem, which is most common in Dell 15,17 & 19" monitors. The symptoms are as you describe:

  • You power on the monitor, the green on/off switch illuminates and the display works for approx 1-2 seconds and then goes blank.
  • The green on/off switch stays illuminated but the screen remains blank
  • If you shine a torch into the LCD matrix you can see the display being rendered faintly
  • Switching the monitor off and then on again illuminates the display again for 1-2 seconds before going blank again
This is a backlight fault and is most likely to be caused by the failure of two of the four driver transistors used to light the lighting tubes in the LCD Matrix. This fault is easy to repair if you (or a friend) have a soldering iron and a voltmeter.

Inside the monitor there is an inverter board that acts as a power supply for the monitor and the logic necessary to control the backlights (illumination and brightness control). There are four lighting tubes, which are controlled by two lighting circuits (two lighting tubes per circuit). At the heart of the inverter board is a chip that monitors feedback from the two lighting circuits and closes the back-light circuit down if either of the lighting circuits fail, thus any component failure will exhibit the same symptoms.

The transistors which fail most often cost pence to replace (types C5706 or C5707). However, their failure in unlikely to be the cause of the problem. My first crack at fixing this fault, by replacing the transistors, resulted in them failing again within 24/48Hrs. The cause of the problem will be dry solder joints or loose connections on the high-voltage side of the circuit, usually on the backlight transformer in the effected circuit. If you re solder each of the connectors on the transformer you will save the transistors from blowing again - the transformer generates 1,400Volts for the lighting tubes and at this voltage, arcing across the a dry solder joint, will quickly destroy the transistors again.

No soldering iron? - A complete inverter board replacement is also reasonably cheap and easy repair. These are widely available.

Sorry of this is more detail than you expected but it may help others reading this article.

Posted on Nov 28, 2010

JMuskovitz
  • 135 Answers

SOURCE: Dell Latitude LCD screen is dark, but computer is still working.

It sounds like the backlight has burned out. The faint light you are seeing is ambient light in your room being reflected through the LCD. Try it in a perfectly dark room and see if you can see anything on the screen. The following page should give you a sense of what is involved in replacing a backlight: http://home.comcast.net/~stonent/screenfix.htm If you aren't comfortable taking things like this apart, I would recommend finding a local repair shop to replace the backlight.

Posted on Feb 18, 2007

lukster
  • 217 Answers

SOURCE: Padlock appears on screen

Hold the menu button until the padlock unlocks, it takes anywhere from 30 seconds or even a minute or so

Posted on Mar 17, 2007

  • 1 Answer

SOURCE: tried to fix dell e172fpb

You must re-solder all the transformer joints (four of them next to the transistors) for a fix. There are cold joints on the transformers that break, causing the transistors to fail. Reheat the joints and add just a TOUCH of solder to them on each and every lead. Don't use too much solder, or you'll cross connect the leads.

That'll fix it.

Posted on Feb 19, 2008

  • 1 Answer

SOURCE: Dell 17" Monitor - Won't display anything, power light flashes

Buy a new one! Thats all I can say babe!

Ha! i was at school searching you online and found this!

<3 Netty

Posted on Jun 01, 2009

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