Dell 1905FP Monitor - power supply

si al encenderlo dura unos cuantos segundos encendido y luego se apaga
revisa los condensadores en la fuente del alto voltage casi siempre se inchan y no dan el voltage correcto tambien podria ser una de las lamparas se quema el cable negativo de la lampara que es el mas delgado donde solda con ella.

You may have bad caps (leaking/bulging tops) in the power supply or blown fuse. This is what the board looks like.
http://lcdrepair.us/1704fptt-1905fp-inverter-power.html

http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Hello,

This is a common indication of bad filter capacitors on the power supply board. Below is a picture of the power supply board with the problem capacitors circled in yellow. The repair is easy, you just need to replace those capacitors and the unit should be as good as new. Below the picture is also a link to a full repair guide showing how to dis-assemble the monitor and what parts need to be replaced. the repair guide has a full parts list for the job.




The repair guide can be found here:http://www.ccl-la.com/blog/index.php/repairing-a-dell-1905fp-1907fp-lcd-monitor/

First place to look is the caps in the power supply section, look for caps with bulging top, replace all will be best bet even you only find one bad cap. Here are the boards (there are two versions): http://www.lcdrepair.us/1704fptt-1905fp-inverter-power.html

http://www.lcdrepair.us/1905fp-inverter-power.html

Worst case will be bad lamps.

Power supply will be the first palce to check (for this 4 years old monitor), look for bad caps with bulging top, see example of failed monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.

It sound like a short circuit. I had this problem with 1907FP model. It had an USB port on the monitor which got damaged and it was shortening to the groung. In your case it might be a bad internal power supply board.

Hello,

This is a classic symptom of filter capacitor failure on the power supply board. The Dell 1905FP and 1907FP both use the same power supply and this type of failure is very common. You can repair the unit by replacing the filter capacitors on the power supply board. Here is a picture of the board with the problem capacitors circled and below is a link to a repair guide for this series monitor.




http://www.ccl-la.com/blog/index.php/repairing-a-dell-1905fp-1907fp-lcd-monitor/

I hope this helps,
BuddyMc

Here is a link to a full repair guide that shows how to open the unit remove the power supply and what components to replace to repair the board. Repairing the board is much cheaper than getting a new board. Below is also a picture of the board with the problem capacitors circled in yellow, these parts are the most common problem with the board.



http://www.ccl-la.com/blog/index.php/repairing-a-dell-1905fp-1907fp-lcd-monitor/

Had the same problem on my Dell E178FP and I made a video on how I fixed it.

Hello,

This is a common indication of a failure in the power supply. There are parts called capacitors that are used in the filter section of the power supply, when they go out the power supply can't properly turn on so you get no picture and a flashing power light. Here is a picture of the power supply board with the problem filter capacitors circled in yellow and below the picture in a link to a repair guide with details dis-assemble and repair instruction along with parts list for the Dell 1905FP and 1907FP models.




http://www.ccl-la.com/blog/index.php/repairing-a-dell-1905fp-1907fp-lcd-monitor/