Intermittant black out on monitor

Back-light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
Main board too should be checked. Contact any service technician.

Hope this helps.... Your monitor has an inverter issue. You know it's an inverter problem when:
1. Your monitor starts normally and displays the startup/desktop screen for a while.
2. Then it suddenly goes off, leaving a blank (black) screen or a very dim display.

To fix this black screen problem, change the inverter board (based on your monitor brand). Source(s): http://lcdmonitorrepair.annics.com

I would replace the monitor because it is 8 years old and prices have dropped considerably.

Sounds to me like a monitor issue. Please try a different monitor.

Power board capacitors blowing or blown, fixable, if you are handy with a soldering iron

dhowie, Monitor will need work done to internal "switch-mode-power-supply"/"CCFL inverter supply board. possible bad electrolytic filter capacitors or thermally intermittant component soldering on printed citcuit board. Your CCFL back-lit LCD display no different than any other brand in it's basic design and operation. Spend an hour in my fixya profile reading about black screen and blank n black screen stuff. Then you will know what you will do or not do to solve V71LCD problem. Follow the links to other sites for more info here on fixya and elsewhere. I will check for response from you at this same posting later.
12fixlouie

This PC was sold new day1, in 2009 (a bad year)
and as such had (per your manual) has toxic mercury CCFL background tube lamps at the LCD screen that do just exactly as told so very well.
and PC means Personal Computer
and CPU means central processing unit, a chip a USA invention !
when the screen is black we use the flashlight test (uk torch , burn free, lol.)
point it here.
see data the CCFL? yes, are dead and the do fail intermittent or by hot and cold room. or dead or dim or got yellow for white tinged.


the problem is bad hardware and googling finds endless geeks that do not understand hardware at all, or little (i call em bit flippers)
Too bad all makers of PC and monitors did not put screen test mode button on the PC, that glows the back lamps
in our shop we use HV CCFL tester to find that truth easy.

the monitor is bad on the desktop PC
if you test the monitor on 2nd PC it fails
if you the failing PC with known good monitor the PC passes all test.
now you learn 3 simple tests, of vast.
but in order based on AGE

big clue #2 is monitor newer showed its ERROR NO SIGNAL or NO connection error, so that clue means PC did not die the monitor did.
no signal , no connection, no sync, or over-range errors never seen.
fans normal. blowing. in PC is clue 3 (and all LED you told too)

Power light cycling about every second is a sure sign of a switchmode power supply fault, causing it to repeated shut down and then try to restart. Most often this is the result of failed electrolytic capacitors. Assuming you can get the monitor apart without wrecking it (some can be very difficult to separate), the failed electros will show bulging ends and/or leakage of electrolyte. These are normally a straightforward repair job depending on the extent of damage from the leakage.

Post a reply if you need more info.

Hi Danny, you haven't been very clear I will assume you pushed the auto configure on the monitor,
I would go into the menu on the monitor and reset the size of the screen if it has a setting for that 1024x768 should fix the problem
let me know what you find as I have never worked with a hp W19 monitor, if nothing else set the monitor to defaults again in the menu and that may get you back to having normal screens.
L8r

indeed, probably the backlight...
Nothing to do about that but repair or replace, sorry...