Question about Dell UltraSharp 1901FP 19" Flat Panel LCD Monitor

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I have three Dell 1901FP monitors, all with the same problem that's been mentioned here already...

...they come on for only a few seconds, then go dark with the indicator light still green. Restarting them causes this to repeat. One actually stayed on for 6 hours before it went dark, then it would only come on for about 15 seconds. (Some dark flickering of the screen was seen just before it went out). I have disassembled one of these monitors and inspected the inverter board for bad caps and bad solder connections without finding any. I am capable of making component level repairs (I was a TV service technician for 20 years) but I no longer have the test equipment needed to do troubleshooting. I'm assuming that since all 3 have the same problem, and it's also been mentioned here several times, that someone would have an idea what the likely defect would be. If that's not possible, then I need to know where I can find 3 replacement boards. PIctures of the inverter board: http://img4.imageshack.us/img4/6665/dscf1317fa.jpg http://img593.imageshack.us/img593/3912/dscf1318ev.jpg

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Hi Stuschwartz1,
Since you are a TV repair tech, you would know the problem of the monitors. You didn't mention anything about you computer or what you are connecting them to.
I am assuming you are having problem connecting to the desktop tower. If so try with a friend's laptop. The laptop should have a VGA port to connect to external monitor. Find out how your monitors react on the laptop. As a tech you should be able to narrow down the problem.
I have this problem with my computer. It was not the monitor problem. It was the VGA card problem on my desktop. I changed the VGA card (15$) and everything works normal again.
Don't leave out the VGA cable also.
I have my monitor (CRT) for 7+ years and still in good condition.
Good luck with yours.

Posted on Dec 07, 2014

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Posted on Jan 02, 2017

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SOURCE: Dell E173FPf lcd- no picture,steady green light

E173FPf Mfg December 2004
This E173FPF has changed much inside from the November 2003 E172fpb which had the famous 4 identical transistors 5707 that would tend to fail in pairs. If your newer E173FPF displays a green power light and fails to display a picture try replacing the 220uf25v capacitors at C6 and C26. Test them with a volt ohm meter and they will test Ok, replace them anyway. Radio Shack did not have the 25v so I used the 35v, display works fine now. There is an E173FPF repair kit with directions available on Ebay if you don't have a parts store in your area and would prefer delivery.

i'm not an expert at anything...x'cept maybe dumpster diving. God Bless

Posted on Jan 06, 2009

proton77
  • 1183 Answers

SOURCE: Front panel lights blink on/off once per second

Hey,
I would like to agree to the diagnosis that you have done on the monitor . Thanks for a well complied solution. You can try the following website
http://werepairmonitors.com/monitor-repair.htm

dell generally sources the monitors from NEC,Hitachi or LG.

Thanks
proton

Posted on Mar 23, 2009

dart666
  • 2 Answers

SOURCE: monitor shuts off but green light stays on

there is no solution a chip is fried i just opened mine up it blows

Posted on May 22, 2009

  • 4 Answers

SOURCE: I have a dead E151FP monitor...need either a schematic or another damaged monitor

You can get repair instructions for the Dell E172/E151FP at ezinearticles.com and order transistors at AnBparts on ebay.

Posted on Sep 05, 2009

Geekman
  • 32281 Answers

SOURCE: BSOD on DELL E228WFPc - goes black in a few seconds

You could have a faulty inverter board. The inverter supplies high voltage to the CCFL lamp/s, these lamps are mini fluro tubes approx 1,5mm dia. and the length of the screen.
Check the inverter output and you maybe able to get parts from
www.lcdparts.net
or from DELL

Posted on Dec 13, 2009

Testimonial: "Thank you, I can't imagine what it would take to get a replacement part from DELL , but I will check on third party sources like the one you mentione"

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A blue lock appears in the middle of my screen, you can not click on it. It disappears and comes back...sometimes open lock, sometimes closed. How do I get rid of it? Thank you!


http://support.dell.com/support/edocs/monitors/1901FP/en/controls.htm
Go here and look at how to disable the OSD lock; try holding the menu key for 15 seconds on the monitor.

Mar 09, 2011 | Dell E152FP 15" Flat Panel LCD Monitor

1 Answer

My Dell Flat Panel Monitor Model 1901FP goes black after it's on for 3 seconds. The green light stays on. I tried replacing cables. Any Solutions?


Inspect the power supply/inverter board for caps with domed tops first, if you do want to DIY repair down to component level, you can get a replacement board for $30.
http://lcdrepair.us/1703fpt-1901fp-inverter-power.html

If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, 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 to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.

Jan 19, 2011 | Dell UltraSharp 1901FP 19" Flat Panel LCD...

1 Answer

I have a Dell monitor model #1901FP when my computer comes on the monitor comes on as it should. After only a few seconds the monitor goes blank. You can turn the monitor off then back on the monitor...


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.

Oct 12, 2010 | Dell UltraSharp 1901FP 19" Flat Panel LCD...

1 Answer

We r using dell lcd 1901fp when we power on it displays for 2 sec and then disply off but power led shows on, again we poweroff and on it it shows for two sec again disply disapper kindly suggest exact...


You could have an inverter board problem. The inverter supplies high voltage to the CCFL lamp which provides the back-lighting.
For service. parts and DIY info check out LCD Parts - click in this link to their WEB site : -
www.lcdparts.net

Oct 16, 2009 | Dell UltraSharp 1901FP 19" Flat Panel LCD...

1 Answer

DELL LCD 1901FP PlZ Find IC Number


The 8 pin IC is UC3843A, SMPS controller. The 14 pin IC is TEA1533AT.
Monitor Mike

Jan 28, 2009 | Dell UltraSharp 1901FP 19" Flat Panel LCD...

1 Answer

Dell 1901fp power board problem


Sounds like a loose connection or broken solder point. It could also be a bad inverter or CCFL.
Have it serviced or replaced.

RDO

Nov 16, 2008 | Computers & Internet

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