Question about Gateway 450SX4 Notebook
My laptop computer screen is bright but cannot see any video or graphic information. Gateway 450sx4 is the model
See if the problem is the graphics chipset, or Video Cable, or inside the Display Assembly.
Laptop OFF, monitor OFF, connect a VGA monitor to the VGA connector (port), on the laptop.
This is a general example of a VGA Cable, and VGA connector,
Scroll down a little for the VGA Cable example
Connect to the Blue VGA port on the back of the laptop.
You can use a CRT type of monitor, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable attached.
Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.
By factory default settings the display should show on the external VGA monitor.
There are at least 3 display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor AND external VGA monitor
3) External VGA monitor ONLY
Press, and hold down on the Fn key, and at the same time tap once on the F3 key.
[The F3 key is the Display Toggle-Over key ]
Still no display on external VGA monitor?
Hold the Fn key down again, and tap once more on the F3 key.
Display on external VGA monitor, looks like the display on the laptop's internal monitor; means there is a graphics chipset problem.
Most of the time it is not a bad graphics chipset.
The problem is the MOUNTING of the graphics chipset TO motherboard, and this is caused by inadequate cooling for the graphics chipset.
If this is found to be the problem I will go into more detail.
I doubt it, but this is Not a guessing game. We are following a diagnostic flowchart.
Good graphics on external monitor?
Problem is the Video Cable, or inside the Display Assembly.
This is an example of the Video Cable,
The Black plug connector at the Top plugs into the back of the LCD screen.
The White plug connector to the Left, plugs into the motherboard.
The small black wire next to it with the eyelet, is a Ground wire.
The long cable going towards the bottom, connects to the screen Inverter.
The Video Cable connects to the motherboard, in an area under the Keyboard.
It then routes up under the left Hinge, and into the Display Assembly.
From there the long single cable coming from the Video Cable, connects to the screen Inverter, and the main cable goes on up to connect to the back of the LCD screen.
All 3 connections of the Video Cable MUST be checked for tightness. You CANNOT visually check alone. You MUST physically try to plug each connection in more tighter.
All it takes is a hair's width of disconnection. You won't be able to see that.
A) Remove ALL power. Remove the AC adapter (Charger), and Battery.
B) Remove the Keyboard Cover.
C) Remove the Keyboard.
The Keyboard Cable STAYS attached to the Keyboard. It removes FROM the motherboard connector.
You won't be disconnecting the Keyboard Cable from the motherboard.
All I want you to do is remove the Keyboard, from the Palm Rest Cover; and roll the LCD screen side over, so the Keyboard is laying on the Palm Rest Cover; with the Keyboard Cable still attached.
This way you can get to the motherboard side of the Video Cable connection, and not have to completely remove the Keyboard.
Also, you can re-connect the necessary wires, and test to see if the motherboard connection of the Video Cable; was the problem.
No? Go on.
Next is disassembling the Display Assembly, to check the screen Inverter connection; and Video Cable connection to Back of LCD screen.
I have a Service Manual link I will give later. (Free)
In it I have found there are no details about disassembling the Display Assembly.
Gateway at that time just states to remove Display Assembly, then reinstall the new Display Assembly.
The plastic frame in front of the LCD screen is the Display Bezel.
Gateway? Term used is probably LCD Bezel, or LCD Panel Bezel.
Looks like this,
Here you see 4 screw holes across the Top, and 2 at the bottom corners.
There are Screw Covers over these Philips head screws.
May be made of synthetic rubber, or plastic.
They are held on by a tiny tab of a rubber cement compound.
Use care when taking them off, and you MAY be able to reuse them.
Due to the age of the laptop this may not be so.
All you have to do is carefully remove any BUILD-UP of old rubber cement, apply a tiny tab of new rubber cement with a toothpick, and reuse the Screw Covers.
I use a computer pick to remove them. Whatever you use, be CAREFUL. Don't poke your fingers, or scratch the LCD screen!
Gently pry up at the Bottom of the Screw Cover.
I LIGHTLY stick them to the Display Bezel for safekeeping.
(They also like to stick to your fingers, the removal tool, and it seems passing satellites)
Remove the 6 Philips head screws.
(Use a multi-compartment container for the various screws you will remove. Label each compartment for the area the screw/s come out of. SOME screws look VERY similar to other screws.
Advise DO NOT mix them up)
The Display Bezel is flexible. Made of space-age plastic. Pretty tough stuff, BUT can be broken. Especially due to the age. (Brittle)
Use care when removing.
This video I found should help you in removing the Display Bezel,
(NO. I DO NOT recommend using a sharp utility knife!)
The screen Inverter is located behind the Display Bezel, and mounted towards the bottom of the LCD screen.
Once the bezel is removed, you can check the Video Cable connection TO screen Inverter.
Remove the screws from the Brackets, or Hinges; on each side of the LCD screen; that allows removal of the LCD screen.
The metal frame going around the LCD screen is the Screen Frame.
The LCD screen is composed of layers, and the Screen Frame keeps them aligned in the factory set position.
DO NOT remove the screws which hold the Screen Frame together.
JUST the ones that hold the LCD Screen Frame to the Brackets, or Hinges.
Holding the LCD screen with one hand, you want to tilt the Top towards you, to access the Video Cable connection TO the back of the LCD screen.
You can set the LCD screen against the Display Cover, and test to see if this was the problem.
No? Go on.
More in a Comment.
Posted on Jan 22, 2013
Many computer users spend long hours online every day and don\'t realize that looking at a bright laptop screen can be hard on the eyes. If you spend a lot of time in front of a laptop screen, consider reducing the brightness of the screen at the earliest opportunity. There\'s a quick and easy way to perform this task so you can save your eyes as well as your battery power.
Press and hold the "Fn" key on the laptop keyboard. This key is usually located at the top right or bottom left of the keyboard. Press the "Up Arrow" and "Down Arrow" keys, which are usually located in the lower right of the keyboard, to increase or reduce the brightness of your laptop screen. Adjust the level so that you can gaze comfortably at the screen without any glare. Disconnect the battery charger from your laptop and repeat the above procedure. On some laptops, the screen brightness varies considerably, depending on whether or not the device is charged. Hope this helps.
Posted on Jan 22, 2013
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Posted on Jan 02, 2017
Nowhere: Only HP and IBM and DeLL offer parts schematics for their laptops. But if you take a look at some of those,you'll have a really good idea how to work on your Gateway,because they're all very similar.
Posted on Mar 10, 2008
SOURCE: Gateway 450sx4
Yes you should try ito adjust the brightness.
Can you see a slight image on the LCD, screen this indicates a backlight problem?
You can connect an external monitor to the video connector on the laptop, then boot it up and see if the is a display on the external monitor. You may have to press the blue Fn + one of the Function key so you can switch the video output to the external monitor. If you get an image on the external monitor then the video card is OK and the fault is with the LCD backlight. This could be a faulty inverter that supplies high voltage to the CCFL lamp or the CCFL lamp is faulty, 80% of the time it is the CCFL lamp that is faulty.
The inverter is easy to replace, the CCFL lamp requires a lot more work and requires soldering skills.
Go to www.lcdparts.net for parts and/or repair service and DIY info.
Posted on Mar 03, 2009
Some are way deep inside, and you have to remove the top part of the case from the bottom.
Some others, you can remove the top power strip, (unscrew screws in the battery compartment, and sometimes on the bottom) and then unscrew the keyboard, and when you remove that, sometimes you can get right to it.
The only problem is, some of the laptop batteries are odd ducks, and not just the standard, they have wires or a metal tag on them. You can always order a new one onces you get to it.
Posted on Apr 12, 2009
it is in back sdie of alptop.
You have to remove 4 screw on each side of square.
then you find motherbord chipset.
cmos cell is fixed on motherbord circuit.
Posted on Jul 16, 2009
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