To fix your problem please follow the below given steps
Step1
Power
on your computer and wait until there should be an image displaying on
your LCD monitor. Look directly into the monitor from a distance of
about 1 inch way. Cup your hands around your face to block out the
light in the room and get a clearer view of the LCD screen. Check to
see if there is a faint light visible in the screen, which will
indicate that the cold cathode backlight has gone out, or no image at
all, which will indicate a different problem.
Step
2
Check the manual that came with your
desktop
LCD monitor or navigate to the manufacturer's website and find the
model of cold cathode bulb that the monitor uses as a backlight.
Purchase a corresponding replacement bulb
Step3
Power
off your computer and then remove the monitor cable from the port on
the back of the computer case. Disconnect the monitor stand from the
monitor either by pulling out the plastic latches or by removing the
screws holding it to the monitor's casing.
Step4
Lay the
monitor face down onto a stable work surface such as a desk or table.
Take out the screws along the edges of the monitor's casing and set
them aside. Lift the back side of the monitor case off of the monitor
and set it aside. Check to see if your model of LCD monitor has the back light directly exposed on the lower end of the monitor or if it is
hidden behind another plastic or metal piece.
Step5
Remove
the screws holding the plastic or metal piece over the bulb if there is
one present and set the piece aside. Check to see if your model of
monitor keeps the bulb in a plastic casing or if it is soldered
directly to the metal. Use a soldering tool to remove the solder or
instead use a rotary cutting tool to cut into the clear plastic casing
around the bulb if it is inside a case.
Step6
Slide
the new bulb into the open spot on the monitor and either solder it in
place or use a piece of tape to cover over the opening you made on the
plastic casing with the rotary cutting tool. Place the metal or plastic
cover back on if there was one and reattach the screws. Set the casing
back onto the monitor and place the screws back in.
Step7
Put the
stand back on the monitor and then reconnect it to your desktop
computer. Power the computer on and wait for an image to appear on the
screen to make sure the back light bulb was installed correctly.
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Step 2
Check the manual that came with your desktop
LCD monitor or navigate to the manufacturer's website and find the
model of cold cathode bulb that the monitor uses as a backlight.
Purchase a corresponding replacement bulb.
Step 3
Power
off your computer and then remove the monitor cable from the port on
the back of the computer case. Disconnect the monitor stand from the
monitor either by pulling out the plastic latches or by removing the
screws holding it to the monitor's casing.
Step 4
Lay
the monitor face down onto a stable work surface such as a desk or
table. Take out the screws along the edges of the monitor's casing and
set them aside. Lift the back side of the monitor case off of the
monitor and set it aside. Check to see if your model of LCD monitor has
the backlight directly exposed on the lower end of the monitor or if it
is hidden behind another plastic or metal piece.
Step 5
Remove
the screws holding the plastic or metal piece over the bulb if there is
one present and set the piece aside. Check to see if your model of
monitor keeps the bulb in a plastic casing or if it is soldered
directly to the metal. Use a soldering tool to remove the solder or
instead use a rotary cutting tool to cut into the clear plastic casing
around the bulb if it is inside a case.
Step 6
Slide
the new bulb into the open spot on the monitor and either solder it in
place or use a piece of tape to cover over the opening you made on the
plastic casing with the rotary cutting tool. Place the metal or plastic
cover back on if there was one and reattach the screws. Set the casing
back onto the monitor and place the screws back in.
Step 7
Put
the stand back on the monitor and then reconnect it to your desktop
computer. Power the computer on and wait for an image to appear on the
screen to make sure the backlight bulb was installed correctly.
Read more:
How to Diagnose & Repair Desktop LCD Backlight Problems | eHow.com http://www.ehow.com/how_5038642_diagnose-desktop-lcd-backlight-problems.html#ixzz0uJr4tmU8