Question about HP Pavilion dv4000 Notebook

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Monitor keeps shutting off after a few seconds- hp dv4000notebook

I have the same hp dv4000. The monitor began to flicker ONLY when on battery power several months ago. Now the monitor backlight only comes on for a couple seconds, battery or AC power. It will come back on for a second or two if I hit the button that sticks up (the button that turns off the monitor automatically when you close the notebook). Sounds like the same problem as the original poster. Any suggestions would be appreciated.

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You may have a defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
www.lcdparts.net

Posted on Sep 09, 2009

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Flickering is a back light issue, jumping around would be caused by the screens reaction to a bad inverter and so would the backlight as well. So flickering backlight and jumping would be a inverter issue causing both problems so I would replace them both.

Thanks if you like my adivice please rate it with the thumbs and leave feedback!

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Try connecting an external monitor to the laptop, power up the monitor first then boot up the laptop. The video data will switch to the monitor automatically, check if the monitor dislays a normal image and see if the image stays on the monitor.
Also press and hold the Fn key and press the F4 key, these keys toggle the video output between the LCD screen and the video port.
Test to see if this functions correctly.
Get back to me with the results of the tests.

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Try this solution :

1. Disconnect the AC Adapter.
2. Remove the Battery.
Note : Please see that there are no external devices or cables connected to the Notebook.
3. Hold the Power button down for 30 seconds to 1 minute.
4. Reconnect the AC adapter and do NOT connect the battery now.
5. Turn on the Notebook.

Additionally, try removing and reinserting the RAM sticks by following the instructions listed in page number 119 of 266 :

http://h10032.www1.hp.com/ctg/Manual/c00530488.pdf

If the issue repeats, try connecting the Notebook to any Desktop Monitor and press the FN and F4 key so that the display will transfer to the desktop monitor connected.

If there is no display on the LCD of the Notebook or on the Desktop monitor connected, issue can either be with the Graphic Card of the Notebook or Motherboard itself.

I am sure these instructions are helpful.

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