Sounds like cold soider joints on your video board. If you take apart the lcd screen and get to the video board, theres 4 capasitors with cooper coils around it. you can add soider to it. theres 2 pins for each. I fixed 15 or more for that same model. Its a known problem with that model. Hope it wworks for ya
Try turning down the brightness. Try 50% and see if it will stay on longer before turning off. This may make the screen usable in the short term.
By turning down the brightness you are reducing the amount of current the screen uses and placing less stress on it.
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If the Video Controller fails, the screen will stay black when the rest of the computer runs as it should. To test this, look to the side of the computer and locate the external Monitor attachment. It is a nine pin male outlet. Take a regular computer monitor and attach it to the connection and turn on the computer. If the Monitor acts like your normal LCD screen, then the main LCD screen is bad. If Neither the Monitor or LCD works, then the Video portion of the computer may be defective.
First of all, boot your system without the monitor connected to it and when you feel that it's booted upto logon screen (or if you haven't assign password it'll directly logon to the desktop, power on the speaker to make sure you can know it's done) connect the monitor. If this isn't successful, please turn off the system and remove the cmos battery, leave it outside for few minutes and again reinstall it. Boot again normally. Still having the same problem? then let's try another method.
Did you see the bios loading (black screen with white text during startup) when you power on the system? If so, press F8 several times while it is booting and select "Safe Mode" and restore your system to previous state. Do let me know if this isn't possible.
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Attach and external monitor and boot the machine. If you don't have one, ask around your friends and family... someone has a monitor.
If you can see stuff on the monitor when it boots, but when you boot with no monotor the laptop screen is blank, then you most likely have a dead lcd panel on the notebook. It would need to be replaced.
If the external monitor also shows nothing during boot then you likely have larger problems.
My HP f1703 is almost 3 years old and started having this same problem. My fix got the display to stay on. Don't know how long this fix will work. I set the monitor brightness to 51 and contrast to 41. You may have to adjust to your levels to your appropriate enviroment. Levels may determine how long the monitor stay operational. Do NOT set your monitor brightness to factory levels it will just start to recreate the problem again.
The monitor should be on with the blue button lighted. If the screen is acting up (you turn it on and the display lights up and then it turns off within 2 to 5 seconds)
Try decreasing the brightness level down as much as possible. Wait 15 to 30 seconds and see if the display comes back to life. If not, turn the monitor off and on again and try the procedure again, if necessary.
I believe the monitor brightness level, set at 100 by the factory setting, is over driving the display and causing the protection circuit to cut off the flouresent lamps that light the display.
HP had an issue with this display, and had a notice to replace them if the problem occurred during the warranty period. They extended the warranty period from Jun 04 to Feb 06. Check with HP Technical Support to determine if your monitor is cover.