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Laptop powers up but no image on screen (HP) - PC Desktops

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Sounds like you need an inverter.This provides power to the backlight.

Posted on Jul 14, 2008

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Hp laptop screen black at startup


Hi
I assume the fan is whirring and you have some lights/LED's glowing. If you look around the sides and back of the laptop you will see a blue VGA socket. Plug a spare monitor into this blue socket, philswift.jpg You may need to use a friends monitor to test it out. If it still does not show an image on the monitor, make the laptop change where it is sending the picture. To do this press 'fn' (function) and hold down. Then press one of the 'F' keys that has a picture of monitors on it. In the photo it is 'F4' philswift_0.jpg
Keep pressing 'F4' whilst still holding down 'fn' as this may scroll through many monitor options. Leave 5 seconds between each press to let the action happen. If you still do not get an image then the laptop monitor graphics card has failed. If you do get an image on the spare monitor but not on the laptop screen then you have a failed backlight or inverter. Angle the laptop and catch the light and see if there is a very feint image on the monitor. It looks very dark but you should be able to pick out what you would normally see. If you can see this very dark image it is the backlight. If you cannot it is the inverter or the LCD screen itself. From here on we are into professional level fault finding, you can see here http://www.daileyint.com/hmdpc/lcd.htm . If the laptop was old and slow it may not be worth repairing. If you do wish to go ahead and reapir send it off to a fixed price repair shop like http://www.sefton-computer-repairs.co.uk/screens.htm or myself at www.tecorum.com It takes a few days to repair and send back.
All the best, Phil

Dec 04, 2010 | PC Desktops

1 Answer

Turning the pc on, screen remains black


If the laptop appears to boot up (ie. the power LED is on and the hard disk LED flashes) but you do not see any image on the screen, then it could be a back light problem. This can be caused by a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to determine the fault and fix :-
http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen

Nov 02, 2010 | HP Compaq Presario SR1500NX (PX786AA) PC...

1 Answer

How do i reboot or reset my hp mini laptop without a disk drive?


Hp laptops come with a Factory image which can be accessed by continuously Tapping the F11 while booting the computer

turn off your system
Turn on
Start tapping F11 Continuously
It would take you to the recovery manager screen
From there you can select the option to restore the computre to original factory condition

Oct 02, 2010 | PC Desktops

1 Answer

My loptop is an Averatec 7100. How can I test the motherboard? I took it to a computer repair shop and they said is the motherboard, I want to know how can I test it on my own.


This is more of a system diagnosis that an actual motherboard testing procedure, but since all components attach to the motherboard in one way or another it could count as a prcess of elimination......

Laptop is dead. How to troubleshoot the problem.
In this post I’ll explain how to troubleshoot a dead laptop and find the problem. The following troubleshooting tips are not model and brand specific, they should work for most laptops.
Let’s take a look at two different scenarios.
Example 1. The laptop is absolutely dead.
When you plug in the power adapter and press on the power button, there is no signs of life at all. The laptop will not make usual noises, LEDs will not light up, the fan will not spin, the screen is blank and black, etc… In short, the laptop is dead.

What you can do in this case?
1. Make sure the wall outlet is working and the laptop DC adapter is getting power from the outlet. Try another wall outlet.
2. Test the laptop DC power adapter, make sure the voltage output is correct. You can test the DC power adapter with a voltmeter.
3. Let’s say the DC adapter is fine and the adapter outputs correct voltage. In this case unplug the power adapter from the laptop, remove the battery, wait for 1-2 minutes, plug in the adapter and try turning on the laptop again.

OK, you tested the adapter and it’s bad. If you decide to replace the original DC adapter with a generic one, you’ll have to follow this rule:
The voltage output on your new adapter has to be exactly the same as on the original adapter. The amperage on the new adapter could be the same or higher.

If nothing helps and the laptop is still dead, apparently the motherboard is fried or there is a problem with the DC power jack. It’s possible the DC power jack is broken and the motherboard is not getting any power from the adapter. In this case you’ll have to disassemble the laptop and replace the power jack.
Example 2. When you plug the DC power adapter and press on the power button, the laptop starts making normal noises, the LEDs work properly but noting appears on the screen. The laptop will not start.
First of all, take a closer look at the LCD screen. Look at the screen under bright light. It’s possible that the image is still on the screen but it’s very faint.
If there is no image on the laptop LCD screen, test the laptop with an external monitor. Connect an external monitor to the VGA port on your laptop and turn the laptop on. You can toggle video output between the internal LCD screen and external monitor by pressing Fn and F4 keys simultaneously on HP laptops, Fn and F5 keys on Toshiba laptops, Fn and F7 keys on IBM laptops. Other laptops may use different key combinations.
Let’s say the external monitor works fine but the internal LCD screen has no image at all. If that’s the case, your problem could be related to the LCD screen or the video cable. Also, make sure the video cable makes good connection with the motherboard and the LCD screen. Try reconnecting, reseating the cable.
In my case, both internal and external monitors were absolutely dead. Neither of them had image. That means the problem is not related to the LCD screen or the video cable. From my experience I know that this problem could be related to the laptop memory.
Try reseating the memory module, maybe it’s not making good connection with the memory slot. Try cleaning contacts on the memory module with pen eraser. Try moving the memory module into another slot. Try replacing the memory module with another known good module, it’s possible that your original module is dead.
If you have two memory modules installed you can try removing them one by one, it’s possible that one of the modules is bad. Try installing different memory modules into different memory slots.

In my case reseating, swapping the memory module didn’t help. I was pretty confident that my problem is not memory related and I moved on.
Try removing battery, hard drive and DVD drive and turning on the laptop without these components.
Also, try turning on the laptop with an external monitor when the video cable is unplugged from the motherboard. If the laptop start with video on the external monitor, apparently there is something wrong with the laptop display panel.
Finally, disassemble the laptop and removed the motherboard.
1. Motherboard. Like on most laptops, in my case the video card is integrated into the motherboard
2. CPU with heatsink and cooling fan.
3. Known good memory module.
4. The power button board witch you need to turn on the system.
5. Working DC power adapter.

Still cannot get any video on the external monitor. The system turns on, the cooling fan starts spinning but there is no video.
At this point I’m 95% sure that the motherboard is dead. CPU failures are not very common, so it must be bad motherboard.





Oct 13, 2009 | PC Desktops

1 Answer

Projector only displays desktop wall paper not laptop images


stop the dual monitor moded and it will project what is on the Desktop screen

for this right click on desktop -> properties -> (on the window) Settings here take away the check box for "Extend my Windows desktop to this monitor" and you can have what ever is displayed on your desktop on the screen

but if you keep the the existing setup then you can just drag the windows to the right or left edges and it will move on to the screen and you can use the projector image as an extended monitor, this will be useful when you want to have your presentation and your background work/ Document seperate from the viewing audience, try it you may like it

cheers

Aug 14, 2009 | PC Desktops

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...

3 Answers

Laptop screen dim


Hi there

HA HA HA , there are no bulbs in laptop screens, is your battery charged, have you changed any power settings.

Boot to safe mode, change power settings reboot.

Thanks

Roger

Nov 13, 2008 | HP Pavilion a305w (DM181AR) PC Desktop

1 Answer

Hi i have hp dv6000 my laptop is on but the screen is blank some time they came up and then went out again please help.


Turn the computer ON. Take a flashlight and shine it at an angle into the screen. If you still see the image on the screen most likely the inverter in the screen has went out. I would suggest taking the laptop to the local authorized repair station.

Nov 10, 2008 | HP PC Desktops

1 Answer

Screen on HP laptop went black.


click start>control panel>system, click hardware tab, choose device manager>imaging devices, look for your adapters, right click, uninstall. reboot.

anonymoose

Oct 11, 2008 | HP PC Desktops

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