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Do I have an inverter problem or bulb problem


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#1 chia99

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Posted 30 October 2011 - 04:10 PM

Hey guys,

I have a Compaq Presario F572US that has the problem of a black screen when I turn it on. Do I need to replace the inverter or the backlight bulb?

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#2 nesrinamb

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Posted 30 October 2011 - 05:05 PM

shine a light at the screen when its turned on, if you can see the desktop in the back its most likely a bulb problem.

#3 chia99

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Posted 30 October 2011 - 05:50 PM

nothing with a light shined on it...

#4 nesrinamb

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Posted 30 October 2011 - 09:48 PM

Well then after that its likely that you have the bad inverter or a lose cable from the LCD.

You can also try to go hook up a monitor to the laptop and see if the monitor recognizes the connection. If the monitor turns on then its the inverter or a loose connection to the LCD that is the problem. If the monitor doesn't recognize it, it may likely be a bad motherboard.

#5 sambitsatpathy

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Posted 31 October 2011 - 03:48 PM

Hi Guys,

I have a Dell laptop that has similar problem. It has XP on it.

When I hook it to a monitor, it displays fine and I can use it as a normal machine. I asked an technician about the display problem. He is suggesting that there might be problem with the video card. He does not think that the light might be dead.

Can the video card cause this? If it is a video card error then how the image comes in another monitor.

Thanks for your time.

Regards
Sam

#6 nesrinamb

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Posted 31 October 2011 - 06:03 PM

Well if it where a video card problem it should also be affecting the external monitor not just the laptops regular LCD. Have a second technician look at it to see what they tell you.

#7 rotor123

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Posted 05 November 2011 - 03:54 PM

I've seen the backlight go bad and I've seen the Inverter go bad and recently I saw a dark screen caused by the cable.
In all three cases the Windows was there very dim when you shine a flashlight on the screen

Most Laptops = no video card. Is your Laptop powered by a AMD CPU and Nvidia GPU then slight chance of motherboard problem.

Take it to a good shop for Diagnosis.

Around here the Diagnostic fee is $49 which applies to the repair labor fee.

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#8 nesrinamb

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Posted 05 November 2011 - 07:02 PM

All laptops carry video cards that are integrated into the motherboard.

#9 rotor123

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Posted 06 November 2011 - 10:34 PM

All laptops carry video cards that are integrated into the motherboard.


If it is built-in it isn't a card. Some laptops do have a replaceable video card. Mainly expensive models.

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#10 nesrinamb

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Posted 07 November 2011 - 10:59 PM

http://www.bleepingcomputer.com/glossary/definition204.html

Had to do it.

#11 ReviverSoft

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Posted 08 November 2011 - 09:15 AM

All laptops carry video cards that are integrated into the motherboard.


That's what you call onboard graphics and not graphics(video) card.

These days, you do find many med-high end laptops featuring a dedicated video card.
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