Question about Dell 19"" 1907fpt dvi rotating lcd monitor w/usb 2.0 hub silver/black
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Posted on Jan 02, 2017
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:
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
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
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
Buy a new one! Thats all I can say babe!
Ha! i was at school searching you online and found this!
Posted on Jun 01, 2009
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