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Re: very dark screen
desktop could be seen (albeit very dark background) then it could
either be the CCF Lamps (cold cathode florescent) or the inverter that
powers the lamps. One way to verify is to shine a flashlight at an
oblique angle to the screen, semblance or part of the desktop could be
Often, the defective component would be the inverter. It is
relatively easy to replace the inverted. It is sometimes more difficult
and challenging cracking open the casing of the display panel of the laptop than replacing
the inverter. Additionally, inverters are readily available online. It
is also not surprising that inverters for other brands/models would
also be used in your Toshiba.
This would be a good place to start for inverter boards. This is a nice tutorial if you are considering a DIY.
this be of initial help/idea. Pls post back
how things turned up or should you need additional information.
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I am not an expert but sounds like the backlight inverter has failed which is found underneath the display whithin the lid as a narrow circuit board, this generates a high voltage so take care. This is a matter of small screws and plastic clip mechanisms holding its display case front and back together. If you can make out screen images then with luck its graphic chip and display are OK. To obtain an external output for the graphics on some older type laptops you may have to enter its Bios setting (if you can see it) though on most laptops this can be worked by selecting a single or set of buttons on mine its with the F1 key but you may have to connect up first, again like mine if it is aware of no external connection will refuse to switch.
If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
The picture board on your monitor is faulty or bad, since it goes
black after few seconds, it means the
board of your laptop has developed fault.
The best thing for you
do now is to take the laptop to a local repairer within your vicinity
to help with the replacement of the picture board
because the fault is not something you can fix yourself. in order not to
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....
Shine a torch light onto the screen. If you can see a faint outline of the images, it could indicate a back light failure. Unfortunately, you cannot fix this by yourself. You will need to take it for servicing.