Hello..Now let's discuss what we
should do when the laptop seems to be booting up without problems, the
hard drive spins appropriately, and we even hear the welcome sound of
the operating system, but we have no display on the LCD panel.
The easiest and most foolproof method for testing your LCD screen
is to hook up the laptop to an external monitor. If the video output on
the external monitor looks fine, this means that the problem is with
the video connector, with your LCD panel itself, or with the circuitry
that turns on the LCD.
What do we do? It all
starts with disassembling the notebook. Find the video connector on the
system board (if the video is integrated on the motherboard) or on the
video card that is attached to the motherboard. Try re-connecting the
cables. You may as well locate the display connector on the back of the
end LCD panel. Re-seat that one too. This way you can be sure that the
problem is not related to connections.
now and then the switch located on the system board that turns the
backlight of the LCD on and off can become stuck. If this is the
problem then your LCD never powers on. There's a little switch that
detects whether the screen of your notebook is open or closed. That's
the one we're talking about. Try to push it down and hope it gets
Disassembling the laptop to unstick
this switch is an option, but sometimes you can get away with not
taking it apart. Try lightly hitting that plastic switch. But
wait, this isn't the only possible cause, unfortunately. Re-seat the
other connectors and cables that are present around the LCD panel and
the video on board (including the inverter).
of the aforementioned can usually be fixed, but let's not forget about
the screen itself. Sometimes the screen can become defective. Here
we'll enumerate a few scenarios where the screen has gone bad and must
be replaced: lots of vertical lines or bands appearing on the screen;
half of the screen works fine but the other half stays either black
(blank) or really white; the output on the screen looks blurred and
changes to different patterns; and so forth. These are almost always
signs of a defective LCD panel.
However, if the
output on the screen is nothing but garbage, such as incorrectly placed
special characters, shadows around the characters, unknown randomly
placed marks of different colors, distorted or ugly-looking geometric
patterns, or tiny little white dots all over the screen, then these are
almost always due to the system board or the connection between the LCD
panel and the video card. Re-seat the connectors.
in all, these are some of the most common hardware failures.
Nevertheless, before we finish this part, let's name some of the
others that will be covered in the second segment of this guide, along
with the promised system instability troubleshooting strategies. These
include clicking noises coming from the HDD, which is the well-known
symptom of a dying HDD. Thus, back up your important data as soon as
possible and order a replacement. Overheating is also discussed
Hope it may helpful for you