global Laptop and motherboard repair tutorial | Seite 32

Chapter 6
Laptop Screen Types: (CCFL and LED discussion), and Repair Methods.
Including LCD Bulb Replacement, Power Inverter Repair
Laptop screens today will use one of two common lighting systems. Both are still considered
LCD Screens because they are. The Image to the screen is Liquid Crystal Display; it is only the
lighting that will change for these 2 types.
LED light on a laptop is newer technology because all screens used to use only CCFL bulbs. The
CCFL bulb is a thin glass tube with a protruding metal pliable rod on either side. Wires are soldered
to both ends of the bulb then attach to a plug that will plug into the power inverter… You will need to
solder the wires to the ends if you ever need to order a replacement bulb. You can however usually
find replacement bulbs that come prewired with plugs also attached. You get the same size bulb as
your screen specs specify.
When disassembling the screen, you will start by removing the power inverter if it is attached.
You will notice that all screens are framed with a thin metal frame. This helps to hold all the screen
parts together it also helps by framing the front screen glass panel in and protects the glass edges from
harm. You are going to use a Razor Blade here to help separate this metal frame from the rest of the
screen.
This frame wraps from the front of the screen panel to the top of the panels edges all the way
around the screen. Most screens will have 1 or several pieces of tape that cover the frames edge. You
need to run the razor blade edge between the seam of the screen frame and the aluminum bulb backing
plate. To do this you will flip the screen to its back side and start at the top of the screen, running the
razor from right to left. Be very careful not to cut the LCD bulb wires or scratch any of the screen
panels. The sides of the screen will usually have securing tape that you need to either peel away or
carefully cut to separate the front metal frame.
Once you have cleared any securing tape, you will now be unsnapping the metal frame away from
the screen panel. You will need a Plastic Pry Tool assist you in removing the frame. The best tool
would a guitar pick. You need to start at the top. It is imperative that you do start at the top of the
screen when removing the frame because you are not completely removing the frame (you can, but it
is not needed to change a bulb).