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My hp vs15 lcd monitor goes black 3-5 seconds after power up... i can still barely see the desktop. should i bother with replacing the backlight and or inverter or just go with a new monitor? i'm fairly good with electronics.

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It does sound like a back light issue. Not under warranty?

The fact that it does light up suggests it may be a heat induced fault? May be just a simple dry solder joint. Although you cannot rule out the CCFL (Cold Cathode fluorescent lamps) being faulty either. A quick check with a meter may tell you if it is the light source or the driver cct that is at fault.

If its the lamps, salvaging some from another LCD may be a good cheap altenative.

Usually there is a simple fault (failed FET/Transistor) causing these problems so if you are good with a soldering iron and can work thru the cct to locate the offending FET/transistor it will be a relatively cheap and easy fix.

Posted on Jul 02, 2008

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IBM 8303 DOESN'T SUPPORT MY FLATSCREEN HP VS15


2 steps:

1. plug the hp vs15 into another computer and see if it works, if not could be a bad monitor.
2. If you have the old monitor, plug it in to the IBM computer and in windows lower the resolution down to 640 X 480. Now turn off the computer and plug in the VS15 monitor. If resolution was an issue it should work now.

Hope this helps

Jan 31, 2012 | IBM PC Desktops

Tip

LCD monitor displays background fine for a second then goes black


If your LCD monitor displays your desktop fine as it boots up and then goes blank after a few seconds, but you can still faintly see your desktop then this may seem like a brightness issue but it's not. The picture displays very faintly, this is because the LCD backlighting isn't working properly. Which in turn is either because (most likely in cases like this) the inverter circuit has failed or the cold cathode tube has blown. If you're new to the electronics business and are not sure how to solder and connect circuits then this is the job for a qualified repair technician. So i suggest you head on down to your local PC store and have a technician take a look.

If you want to try it youself go here to order some spares.
If the monitor switches off and you can't see your desktop faintly then this may just be a power saving issue. Yo fix this check out my other tip here.

If your monitor is less than a year old then I suggest you take it back to where you bought it and have them send it in for repairs or swop it out with a new one. LCD monitors usually have at least a 1 year warranty sometimes it can even be up to 3 years if you register yours when you purchase it or if it's a really expensive screen.

If the monitor is a good 4-5 years old then it may not be worth fixing or may be too expensive. I suggest you invest in a newer widescreen option. LCD monitors have drastically come down in price over the years and you can easily get a wopping 23" for as little as $180.

on Nov 14, 2010 | PC Desktops

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I have a hp laptop. was on line and screen went black. and will not show again. it strats up sounds but black screen.what do i do


1) Do you have a VGA monitor that you can use for an external monitor?
{VGA monitor is also referred to as a CRT monitor. Looks like a small TV}

The back of the laptop, or side, has a VGA port. The VGA monitor is plugged into it.
{Laptop off}
Then the VGA monitor is turned on, and allowed to 'come to life'.

Now turn on the laptop. Press the Fn key down on the keyboard, and hold it down.
Now press the Monitor toggle over key.
Since you did not state the HP laptop Model Name, and Model Number, I can only give you generic guidance on this.

The monitor toggle over key has a monitor screen symbol on it. It will be one of the F keys.

(It's an External Monitor toggle key.
Press it one time and the display toggles over to an external monitor.
Press it again, and both the laptop LCD screen, and the external monitor have a display on them.
Press it once more, and the display goes back to the laptop's LCD screen )

If display shows up on the external monitor, you have a problem with the display of the laptop.

Primer:
An LCD screen cannot produce enough light by itself. It needs an additional light source.
A Backlight is used as an additional light source.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp {Bulb}
Similar to the fluorescent lighting used in homes and businesses, but on a MUCH smaller scale.

{Average Backlight is 3 to 5 inches long, and half the diameter of a No.2 pencil.
The Backlight is located on one edge of the LCD screen}

An Inverter is used to provide power for the LCD screen, and the Backlight.

90 percent of the time the problem is the Inverter.

Inverters are relatively cheap, and if I knew the Model Name, and Model Number of your HP laptop, I could give you a link to HP Support where you could download the Service Manual for free.

This way you would have a manual to show, and detail how to replace the Inverter, and I could guide you.

I could also give links for your perusal for Inverters.

There is one more thing however.

HP Pavilion DV2000, DV6000, and DV9000 series laptops, have a graphics chip overheating problem.
The laptop comes on, the blue indicator LED lights light up, but the LCD screen is black.

This video explains why, shows a solution to fixing the problem, and details out a lot more than I am privileged to state here,

http://www.youtube.com/watch?v=bnkQNmKauEc

Have further questions regarding any of the above, please state in a Comment.
(Believe upper right of your page)

Regards,
joecoolvette

Dec 02, 2010 | PC Desktops

1 Answer

LCD monitor back light won't stay on


Hello,

Running any device 33% higher voltage for any length of time will likely harm it. However, knowing that that worked you have two possibilities.

1. The 12V AC adapter is dying and simply needs replacement.

2. The FLR inverter(backlight) is dying and giving it some extra juice forced a little more life out of it.

Do your best to track down a propper adapter(with 5%, 11.4V-12.6V), if this works that should be your solution, if not then the FLV is dying and you may need a pro to replace it. Generally about $100 at a shop.

Hope this helps FixYa,

Chris

May 14, 2009 | Toshiba Equium 7100S PC Desktop

1 Answer

Screen turns blank all of sudden and works normal after switching of the system for 1 hr or so.


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:
  • 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 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.

May 12, 2009 | HP Compaq dx2250 Microtower - Get 3...

1 Answer

The LCD does goes dark after power on


you mean few second the monitor goes in black. then its come. if it happen, it is ok

Jan 21, 2009 | Sony VAIO® VGC-LS37E PC Desktop

1 Answer

When i boot up my desktop the monitor comes on then goes off, it come back on momentarily when windows starts up and then goes off again. i can turn the monitor power off then on again and it comes on for...


Your backlight might be dead. Try using a flashlight to see if you can see a screen
when it turns black. If you can, its a backlight problem. What model of screen do you have?

Oct 25, 2008 | PC Desktops

1 Answer

Monitor goes black but the green light stays on. I turn the power button off and then back on and it comes back on. It may stay on for a few seconds to several minutes.


Check to see if the image is Dimmed. Chances are the power supply on the FPD is either dead or not supplying power to the back lights.

Your problem is the back lights are not being powered. There is a signal going to your FPD because the power light remains on green, but the back lights are what helps support an image from the Front Panel Display.
The only way to fix this is to open it up.

If its got 3 boards inside((logic-->video, Inverter, Power)) The problem is the Inverter. Replace it.
The inverter is the board that supplies power for the backlights to turn on. The backlights
provide a light.for the LCD Panel(provides color and is the logic. ... similar to a projector.
If its got 2 boards inside ((Logic-->video, Power)) The problem is the power supply. The inverter is embedded onto it.

Simply replace the part with a known good one, and you got a spanking new monitor.

Sep 18, 2008 | PC Desktops

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