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Compaq Presario R3000 dim screen but not dark

I have a compaq presario r3000 which is having a lighting problem. I removed the inverter and lcd from my other compaq presario r3000 (which work fine) and switched them w/ the lcd and inverter in my compaq with the bad lighting. The laptop was still dim (not dark). When i placed my "bad" lcd and inverter in my other laptop they worked fine. Since my problem is not the lcd or the inverter, i am lost as to what to do next. It's not my laptop button that when pressed makes the screen dark. I think i should clear up that my screen is not dark. I can see images just fine, however, it is not as bright as it once was. I can still use it, but it's a nuisance when i have to use it at night.

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  • gr568238 Jan 01, 2009

    thank you so much, i feel so stupid. It always is a simple problem like that. I'm a bit pissed that i opened two Compaq's for nothing but at least I got some experience out of it. Thanks again.

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Sounds like the auto-dim in the BIOS is set too low. Fortunately the Compaq R3000 allows you to adjust the brightness right from the keyboard. Hold down the [FN] function key while tapping the [F8] key will brighten the screen, while [FN]-[F7] will dim it. The settings are different for running on AC power and battery, so you must do each individually.

Posted on Dec 31, 2008

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Posted on Jan 02, 2017

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Compaq presario v5000 dark screen and failing hard drive


The problem you described, is related to the inverter board.
There's a little board, that take care of lights on the monitor. You must replace the inverter board to solve the problem.

Here you have an image, of an inverter board.

ed452f58-06a1-44e2-8fe4-71fd08bc1dd5.jpg

Good luck, and be safe!
Inverter boards, it's dangerouse to replace yourself if you don't know what you are doing. High-Voltage inside :)

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You have to use it more often to cure the capacitor in the inverter?

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Do you have another screen attached? This will cause this trouble. If not, if you look closely at the screen, can you see an image? You might be able to shine a light into the screen and see an image. If so, sounds like the inverter is or has died. Try tapping the bottom plastic on the screen when the laptop is on and see if it flickers. If it does perhaps it is a loose connection/solder joint on the inverter board.

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You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:
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  • 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 it up, 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 for parts, repair service and DIY info.

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1 Answer

Presario R3000 display went dark can not see Screen goes black after a few minutes of use. You can see a very faint image after a few seconds, but you must do a soft re-start to bring the screen back....


Defective CCFL backlight may has 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.
  • 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 it up, 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 for parts, repair service and DIY info.

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have you any other A/V ports out ie Svid etc if so try that via an A/V lead, if that works reset your bios settings to minimal settings, if that doesnt work search the 'net someone somewhere has had the same problem! try shining a flashlight/lamp onto the screen whilst booting up, if you see anything on the screen then your inverter is definatly gone and yes it could still be your inverter! your laptop may have software/hardware issues with an external monitor?

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If you already replaced the inverter and the screen still continues dark, you need to replace your lcd screen. Your video card is good due you have signal with external monitor.

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