The backlight on my laptop does not start up until about 10-12 minutes at most after the computer starts up. Until then, I cannot see anything unless I lay the screen flat down on the table and view it from an angle. Is there a driver I can install or something to fix this?
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Re: My laptop screen is very dark
I'm afraid you won't be able to correct this with a software patch.
Two things can happen relative to the LCD backlight which is your developing problem.
- If the fluorescent tube has either lost gas or darkened internally, it will have to be replaced.
These cost ~$80-$100 US.
- The inverter that produces the high voltage may be dying from a bad electrolytic capacitor but this isn't likely to be repaired anywhere since many of these boards (if separate at all, some are,others not) have components on them placed by robots that aren't good candidates for manual repair.
The inverter boards should be available from the manufacturer or an 'authorized' repair station but they may not want to sell it to you and may ask you to send it in to them.
I can't give you an estimate on the potential repair cost and they may replace the entire top section because they can charge you more and spend less time on the unit.
If you can still see the LCD at an angle, it hasn't failed, but they may toss it anyhow.
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The problem could be as simple as the hinge switch that switched off the backlight when you close the cover. If the computer seems to start up, but you just can't see anything, wait until the unit has had enough time to fully come up to either the login screen or the desktop (however it's configured to start). Look VERY carefully at the dark scrren to see if you can just make out the login graphics or desktop icons. If you can, then the unit has booted up ok, but your LCD backlighting is not working. This could be because the backlight lamp is defective, or its power supply may be defective, or the little switch back near the hinge of the case is stuck or defective. Check this first.
You may have a bad backlight screen power supply board and that is usually mounted in the bottom part of the screen right behind the front bezel. This supply's high voltage to the backlight tube that lights the screen. This is kind of like a small florescent tube that uses high voltage to fire the backlight and is a common failure point in laptop screens. Easy to fix, just pop the front bezel off and the module will be in the center bottom section of the screen. Do a YouTube search on how to disassemble your model's screen and the parts can be found on Ebay. Good luck.
Try (on the bottom of the laptop) removing the door to the RAM, and pulling one stick out at a time, than starting it, and than the other stick, and starting it. If you still have a black screen, than the motherboard has gone.
What is wrong with the backlight? The computer screen is just dark? I would start with the inverter. The inverter is usually the problem when the screen goes dark but people think it is the backlight. The backlight alone is very hard to change too. Go with the inverter, I would bet that is the issue.
I would say you either have a damaged inverter board or screen baclight lamp. Usually the inverter board fails in one of the following ways:
1. When you turn on the laptop, the screen lights up for a short period of time and then goes dark. You still can see an image but it is very dark, almost invisible and definitely not usable. When you restart the laptop, the screen lights up and then goes dark again. The laptop works fine with an external monitor. 2. Your laptop turns on but the screen remains dark all the time. You still can see a very dim image outline. The laptop works fine with an external monitor. 3. The laptop screen works fine for hours or even days, but sometimes it goes very dark as it mentioned above. When you restart the laptop, the screen works fine again.
Inverter failure symptoms are very similar to backlight lamp failure symptoms and in most cases you cannot tell which one is causing the problem until you replace either the inverter board or the backlight lamp. From my personal experience, inverter boards fail more often than backlight lamps. If you have to guess, replace the inverter first.
What you have is an inverter failure most likely. The inverter takes the AC adapter voltage and converts it to high voltage AC for the backlight bulb. Backlight bulbs rarely fail but the inverters do. Ebay has inverters for around 15-20 bucks. The inverter sits under the lcd panel behind the screen bezel. In most cases, removing the bezel is all you need to do to change the inverter out. Below is a link to the service manual for that model.
When you click on the link go to page 4-61, this is the start of the lcd disassembly. I thing just 4 screws need to be removed and then take your finger nails and pry off the bezel in a small area and work your way around the screen until the bezel comes loose. When replacing the bezel always start at the bottom between the hinges and work your way up and around.
This is most likely your backlight CCFL tube or Inverter. Unless you are very confident and experienced at laptop repairs, you should take this into a repair shop to be fixed. It will only need a £10 part. I recently replaced my backlight and it cost £9.99.
As per your description, I find that the issue is with the LCD Backlight which is also called as LCD Inverter which lights up the LCD to show us the Display on the LCD Display.
If this Backlight is gone bad, you will be barely able to see the Display on the LCD.
Coming to the Noise you had mentioned above can be from the Cooling fans of the Notebook which will be spinning at high speed when the Notebook starts and will reduce gradually after few minutes.
I recommend you to try cleaning the Cooling fan vents using any Vacuum Cleaner or Air Blower.
I recommend you to contact any nearest HP Authorized Service Center and get the LCD Backlight replaced.
Hope this helps....