Question about Dell UltraSharp 1905FP 19" LCD Monitor

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My Dell 1905FP LCD monitor Power light blink on startup

I have a 3 yr Dell UltraSharp 1905FP LCD monitor. Recently, when I turn it on, the power on green light would blink continuously for about 1 minute with no picture before the light become steady green and have picture (everything working). Now it is up to 5 minutes. Other than waiting for the monitor to display the video, everything is fine. It acts like it is waiting for something to warm up. Does anyone know what is the problem? Thanks.

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It's most likely a couple of the eletrolytic capacitors on the power supply board. This type of cap can go bad over time, and that would lead to the symptoms worsening over time like yours has. It's mostly likely a couple of 10V, 100uF caps in my experience. They should be easy to identify: they will be the ones with the top bulging upwards. Replace those and you should be good to go! If there aren't any bulging caps, just replace all the 100uf caps. (there should be no more than 5)

If you attempt this yourself though be carefull: any caps that haven't gone bad can hold a charge even when the monitor is powered off. Depending on the capacitor of the cap, accidentally contacting the leads on a charged cap can be anywhere from painfull to dangerous! A preventative measure is using an insulated handle screwdriver, short both leads of the cap together on the backside of the board to drain the cap.

Posted on Dec 07, 2009

  • jayndi103 Dec 07, 2009

    Whoops, that should have been 10V 1000uF caps, NOT 100uF....

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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.


My Dell 1905FP LCD monitor Power light blink on st - 9_24_2012_8_40_16_pm.jpg

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

I hope this helps,
BuddyMc

Posted on Sep 24, 2012

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Posted on Jan 02, 2017

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SOURCE: I have a 3 yr Dell UltraSharp 1905FP LCD monitor.

yman1949, Your 1905FP unit is not working as it was designed to do! Here is something you can relate your problem to. The white light needed to see what is on your lcd panel is produced by "cold-cathode-fluorescent-lamps" (2) that require 600-1200vac to start and sustain the fluorescent light output. If the DC source (switch-mode-power-supply) or the CCFL's electronic ballast circuit (inverter) fails you will have a black SCREEN to look at. However, your problem is just a little different, yet still a common one that can be dealt with in the same manner as any lcd with a faulty SMPS or INVERTER circuit. I highly suspect that over time (3yrs) this unit has developed a (1, maybe 2) "thermally stressed" solder joint(s) in either of the two circuits, and have now turned thermally intermittant. Once that occurs, the gases in the air we breath start to play a major role in making the problem WORSE!! They now invade the void in the thermally FRACTURED solder joint, and begin to OXIDIZE the metal (tin,lead,silver) causing more resistance in the surrounding area, thus taking your monitor a longer period of time to turn on than before. If the monitor were to have warm air force fed thru the rear ventilation slots prior to turning on the unit, to warm it up from being off all night, you might prove out this therory. This unit might be fixed quite easily with just reheating a "frosty" looking solder joint on a printed circuit board. Finding it is another thing! I use an old WWII surplus inspection microscope to find them when a magnifying glass can't cut it!! Well, yman1949 let me know what you find out, lmistyrel
@aim.com because I'm curious. You can do additional comment when you have time, after visiting YOUTUBE to watch some video clips of "LCD monitor disassembly" and "LCD monitor repair"!!! The longer ones are better but none have purchased any CLOSE-UP lenses to show any real close-ups required to SEE the PROBLEM of HAIRLINE thermal fractures of power transistors and inverter "step-up transformers" on the suspect boards. You may also visit a site run by another tech on fixya. www.ccl-la.com/badcaps.htm who also knows about the common failure modes of the crappy far-east junk monitors we import into the USA. Pay particular attention to pictures of failed "electrolytic filter capacitors that have "swollen/domed" looking tops that mayor may not be leaking stuff out the top or bottom!!! Good luck and I hope to see some stuff added to the above request. I'm 12fixlouie aka louie12fix

Posted on Nov 15, 2009

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May 05, 2011 | Dell UltraSharp 1905FP 19" LCD Monitor

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The monitor does not power on,also there are no lights on the front


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Apr 16, 2011 | Dell UltraSharp 1905FP 19" LCD Monitor

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CAN'T GET THE MONITOR OUT OF POWER SAVING MODE


Hello,

If you have a blinking power light and no display even when you first power up the unit then its not in power saving mode. The blinking power light indicates a failure of the filter capacitors on the power supply board. This is a very common problem with LCD monitors after a few years of service. The power supply can be repaired by just replacing the defective filter capacitors. Here is a picture of the power supply board with the bad caps circled in yellow and below that is a link to a full repair guide showing how to open the unit and what to replace including a full parts list.


9_24_2012_8_54_49_pm.jpg

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

I hope this helps you out,
BuddyMc

Feb 11, 2011 | Dell UltraSharp 1905FP 19" LCD Monitor

1 Answer

Dell 1905fp No Display ( No Picture) on screen but Power Indicate light stays on green. Or Screen Flickering.


You have either power supply or inverter circuits failure, worst case will be lamps.
Most common failure in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed Dell monitors to get some ideas what goes wrong: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.
http://www.badcaps.net
http://en.wikipedia.org/wiki/Capacitor_plague

Boards: http://www.lcdrepair.us

Apr 05, 2010 | Dell UltraSharp 1905FP 19" LCD Monitor

1 Answer

Hows it going...well i got this dell 1905fp monitor... i plugged everything in and you see that it on but no picture....also the powere light not on...but u see the monitor on you caN TELL


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.

Feb 15, 2010 | Dell UltraSharp 1905FP 19" LCD Monitor

2 Answers

My Dell 1905FP 19 monitor went black & green power light flickers


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.

Nov 20, 2009 | Dell UltraSharp 1905FP 19" LCD Monitor

3 Answers

I have a 3 yr Dell UltraSharp 1905FP LCD monitor. Recently, when I turn it on, the power on green light would blink continuously for about 1 minute with no picture before the light become steady green and...


yman1949, Your 1905FP unit is not working as it was designed to do! Here is something you can relate your problem to. The white light needed to see what is on your lcd panel is produced by "cold-cathode-fluorescent-lamps" (2) that require 600-1200vac to start and sustain the fluorescent light output. If the DC source (switch-mode-power-supply) or the CCFL's electronic ballast circuit (inverter) fails you will have a black SCREEN to look at. However, your problem is just a little different, yet still a common one that can be dealt with in the same manner as any lcd with a faulty SMPS or INVERTER circuit. I highly suspect that over time (3yrs) this unit has developed a (1, maybe 2) "thermally stressed" solder joint(s) in either of the two circuits, and have now turned thermally intermittant. Once that occurs, the gases in the air we breath start to play a major role in making the problem WORSE!! They now invade the void in the thermally FRACTURED solder joint, and begin to OXIDIZE the metal (tin,lead,silver) causing more resistance in the surrounding area, thus taking your monitor a longer period of time to turn on than before. If the monitor were to have warm air force fed thru the rear ventilation slots prior to turning on the unit, to warm it up from being off all night, you might prove out this therory. This unit might be fixed quite easily with just reheating a "frosty" looking solder joint on a printed circuit board. Finding it is another thing! I use an old WWII surplus inspection microscope to find them when a magnifying glass can't cut it!! Well, yman1949 let me know what you find out, lmistyrel
@aim.com because I'm curious. You can do additional comment when you have time, after visiting YOUTUBE to watch some video clips of "LCD monitor disassembly" and "LCD monitor repair"!!! The longer ones are better but none have purchased any CLOSE-UP lenses to show any real close-ups required to SEE the PROBLEM of HAIRLINE thermal fractures of power transistors and inverter "step-up transformers" on the suspect boards. You may also visit a site run by another tech on fixya. www.ccl-la.com/badcaps.htm who also knows about the common failure modes of the crappy far-east junk monitors we import into the USA. Pay particular attention to pictures of failed "electrolytic filter capacitors that have "swollen/domed" looking tops that mayor may not be leaking stuff out the top or bottom!!! Good luck and I hope to see some stuff added to the above request. I'm 12fixlouie aka louie12fix

Nov 14, 2009 | Dell UltraSharp 1905FP 19" LCD Monitor

1 Answer

How do you replace a power supply unit in a 1905fp Dell Moniter?


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/
9_24_2012_11_31_58_pm.jpg

Jun 26, 2009 | Dell UltraSharp 1905FP LCD Monitor

2 Answers

My dell 1905FP power button flashes green and will not turn off, the screen is black.


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.


9_24_2012_11_00_25_pm.jpg

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

Mar 25, 2009 | Dell UltraSharp 1905FP LCD Monitor

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