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Hi There, I have a Gateway 400sd4 with no display on LCD screen it has backlight.I get perfect video on an external monitor.I have installed a "known good" LCD screen with no change.I have toggled the outputs between internal,external & both.That works correctly & I am able to brighten & dim the backlight. Is it time to condem the system board? Is this a "repairable"problem with the system board? Thanks,Rocky

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  • rockman10 Jul 03, 2009

    Yes very helpful

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I don't think it is repairable you have to replace the Motherboard, as the video card is onborad.
Contact gateway and get a new MB.

http://support.gateway.com/s/faq/c-custserv/cserv67.shtml

Thanks
Kinldy rate the answer
Kevin

Posted on Jul 03, 2009

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2 Answers

Screen on ma2a gateway doesn't turn on. Is it the video card?


Borrow a monitor and plug it into the VGA port. That might tell you whether the graphics card is bad.

Nov 10, 2013 | Computers & Internet

1 Answer

No video at power up


See if the problem is the graphics chipset before going any further.

If it isn't then the problem lies with the Video Cable, (Gateway = LCD Cable), or the Display Assembly.

The heading states Gateway LT2104u Netbook PC. This is what I'll be basing the solution on. However the main part of the solution, will apply to all laptops/netbooks.

1) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port (Connector) on the Left side of the netbook.

[ External VGA display port.
This is an example of a VGA connector, (Port), and a VGA Cable,

http://en.wikipedia.org/wiki/VGA_connector ]

The external VGA monitor can be a CRT type, (Cathode Ray Tube. Looks like a small TV), or a flat LCD screen monitor that has a VGA cable.

2) Turn the monitor on. If a CRT type allow it to warm up.
Turn the netbook on.

By default the display should be shown on the external monitor.
IF not;

A) Press, and hold down on the Fn key, and at the same time tap once on the F5 key.
(The Fn key is at the Bottom/Left of the Keyboard. The F5 key is at the Top of the Keyboard)

No display still?
There are at least 3 display options;

1) Internal monitor of the laptop ONLY
2) Internal monitor of the laptop AND external VGA monitor
3) External VGA monitor ONLY

You may have to hold down on the Fn key, and tap the F5 key more than once.

IF, NO display shows up on the external monitor, you have a bad graphics chipset.

[ Chip and Chipset are slang terms for I.C.
Integrated Circuit,

http://en.wikipedia.org/wiki/Integrated_circuit

The GPU is the graphics chipset,

http://en.wikipedia.org/wiki/GPU

The GPU for a Gateway LT2104u Netbook PC is an Intel GMA950 ]

IF, display does show up on the external VGA monitor, you have either problems with the Video Cable, (LCD Cable), or the Display Assembly.

LCD Cable:

1) Connections;
The LCD Cable connects TO the motherboard, and TO the back of the LCD screen, in the Display Assembly.

IF, either connection is loose, you will have display problems.

Check both connections.
This requires partial disassembly of the netbook to access the motherboard side of the LCD Cable.

Also requires partial disassembly of the Display Assembly (Gateway = LCD Module) to access the connection at the back of the LCD screen.

2) Damage;
Observe the LCD Cable on the motherboard side. See if there are any obvious signs of damage to the LCD Cable's sheath.
The most susceptible area to damage is the area under the left Hinge.

However, the LCD Cable should be removed, and a continuity check of the cable should be performed with a multimeter, set to Ohms.

(By checking the connections, you are at a point anyway, that removing the LCD Cable should be no problem)

LCD Cable checks out OK?
LCD Module problem; (Display Assembly)

The LCD Module consists of the;
1) LCD Bezel,
2) Camera Module,
3) LCD Module Brackets, (Includes Hinges)
4) Microphone Module,
5) Wireless 3G Antenna,
6) WLAN Antenna cables, (Wires),
7) LCD Screen Assembly,
8) LCD Module Cover.

Primer:
An LCD screen does not produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED lights.
(CCFL = Cold Cathode Fluorescent Lamp. Similar to Fluorescent lighting used in homes, and businesses)

The Backlight for the Gateway LT21 series of Netbook PC's, is a series of LED lights.

There is no screen Inverter that is replaceable by the consumer.
The repair is to replace the entire LCD Module.

http://support.gateway.com/s/notebook/2009/gateway/lt/lt21/LT21sp4.shtml

To conclude:
If the problem isn't the graphics chipset, (Motherboard replacement), and it isn't the LCD Cable, the problem is the LCD Module.

Gateway LT21 series of Notebook PC's, Service Manual, (Free),

http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-gateway

Go to where it states Gateway 400. Drop down to the second line, (EC54), and scroll across to LT21 in blue.
Left-click on LT21.

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the file name (LT21) it may take up to 30 seconds, before the first page comes up.

{ You can save this Service Manual to your computer. This way you can burn it off to a CD disk, AND remove it from the computer to save harddrive space, and not have to temporarily download it again }

For additional questions please post in a Comment.

Regards,
joecoolvette

Jan 28, 2012 | Gateway LT2104u Netbook

1 Answer

I have a gateway netbook and the screen turns white after startup. What can I do to fix it?


Sure wish I knew the exact Model Number of this netbook. It's on the bottom in a white Service Tag, or sticker.

All I can give you is generic information.

On the back of the netbook, or on one of the sides, is a VGA connector. (Perhaps even the front)

This is a basic example of a VGA cable, and a VGA connector, (To the right is the connector),

http://en.wikipedia.org/wiki/VGA_connector


Netbook OFF, monitor OFF, connect the VGA cable of the monitor to the VGA connector on the netbook.

You can use a CRT monitor that looks like a small TV, or an LCD flat screen monitor that has a VGA cable.

Turn the monitor on. IF it is a CRT monitor give it a few minutes to 'warm up'.
Turn the netbook on.

IF the display does not automatically come up on the external monitor, (The VGA monitor), press, and hold down on the Fn key, and at the same time tap once on the Display toggle-over key.

Again generic information;
The Fn key is usually located on the Keyboard near the CTRL key to the left.
I have no idea where your Display toggle-over key is.

This key will be one of the Function keys at the top of the keyboard. Either F1, F2, F3, F4, F5, F6, F7, and so on.

There should be a monitor symbol on this particular key. Will look like an empty rectangle with rounded corners. Supposed to represent a monitor. There may be an arrow to one side of it.

The arrow represents the display moving over.

Different laptops, (netbooks), have different options.
Usual is;
1) Just the internal monitor of the laptop
2) Internal monitor of the laptop, AND the external monitor
3) External monitor Only.

Do to there being more than one option, you may have to tap the Display toggle-over key more than once.

A) White screen also shows on external VGA monitor?
You have a bad graphics chipset.

For most laptops, and I'm betting with this netbook, the graphics chipset is soldered directly to the motherboard. This is Integrated Graphics.

Another term for Integrated Graphics is OnBoard Graphics.
ON the motherBOARD.

This would mean replacing the motherboard.

(IF the netbook does indeed have a graphics card, the card could be replaced, and not the motherboard)


B) Display on external VGA monitor is okay?
There is a problem with the Display Assembly.

Essentially, the entire upper half of the netbook, is the Display Assembly.

1) Display Cover: The plastic top cover of the netbook.
2) LCD screen
3) Display Bezel: The thin plastic frame in front of the LCD screen. Resembles a picture frame
4) Inverter (Screen Inverter)
5) Webcam (IF installed)
6) Brackets which hold the LCD screen to the Display Cover, LCD screen frame, Hinges, various screws, and so on.

Primer:
1) An LCD screen does not produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp. (Lamp = Bulb)
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale,

This example is just to show you where one type of Backlight is located, and what an average Backlight looks like,

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

With a LOT of laptops, and probably this netbook, the general repair method for replacing a Backlight is to replace the LCD screen.

An LCD screen is composed of layers. These layers are held in place by the Display Frame. A thin metal frame which surrounds the outside edges of the LCD screen layers. Also resembles a picture frame.

As you can see from the above link, the Backlight is accessed by removing the Display Frame on one side, or all together. This allows the LCD screen layers to move around. They MUST be kept, or put back in the exact location they were in, as set by the factory.

This is why the general repair method is to replace the LCD screen, for those who do not possess the technical skill of replacing, OR the manufacturer does not offer just the Backlight bulb.
{LCD screen = $$$$$. Backlight bulb is usually around $15 to $30}

2) Inverter:
An Inverter converts the electricity from the laptop for the Backlight.
In 90 PERCENT of Display Assembly problems, the fault is the Inverter.

OR, it may just be a loose Video Cable, or Inverter Cable.
The connections may be loose.

This requires partially disassembling the netbook, down to the connection of the Video Cable TO the motherboard, to see if this connection is tight, and may also require disassembling the Display Assembly partway, to see if the connection of the Video Cable TO the LCD screen is tight.

{You cannot just eyeball the connections. They need to be physically checked to see if they are plugged in tightly}

Requires partial disassembly of the Display Assembly, to see if the connection TO the Inverter is tight, and FROM the Inverter to the Backlight is tight.

Connections prove to be tight, visually inspect the sheath of the Video Cable for obvious signs of damage. If the sheath is damaged, there is a good chance that one of the thin tiny wires inside it has become stretched, and is broken.

Obvious signs of damage, or not, I would suggest removing the Video Cable, and with a multimeter set to Ohms,(1K) check the continuity of the individual wires in the Video Cable.

Be sure the problem is not the Video Cable.

Video Cable proves to be good, replace the Inverter.

(Replacing an Inverter is a simple task, and the cost of the Inverter is economical enough to warrant this type of procedure, IMHO)

Still no satisfaction? Replace the LCD screen.

Post the Model Number in a Comment, and I'll make this solution more custom to THE netbook you have.

Regards,
joecoolvette

Oct 17, 2011 | Gateway Computers & Internet

1 Answer

I don't have video on my 400sd4 laptop


If the system is booting up completely and you can hear is starting up then the problem is limited to your video.
First try this
Boot up your system so that it's in windows (listen for start sounds and windows music etc)
once you believe the system is fully booted press and hold the FN key. While holding FN press and release the F3 key one time and then let go of FN. Wait a few second and see if the LCD screen comes on. If it does not try FN-F3 a couple more time, waiting a few second in between.
If that does not work then try plugging in and external monitor to verify that the system is working otherwise. If the external monitor does not come on right away then press Fn-F3 again with it attached to allow the system to send a signal to the external port.
If it works on the external monitor but cannot come on the LCD screen, the that indicates a problen inside your laptop or LCD screen.

Dec 03, 2009 | Gateway 400SD4 Notebook

3 Answers

Hi my screen has gone blank on my laptop advent 5431 any ideas


I have gateway mx7118 and my screen went dim when power on. I connected to a external monitor and no pic on the monitor.
Could the problem be I need to replace the LCD invertor?

Nov 29, 2009 | Acer Aspire 4720 Notebook

2 Answers

I have a Dell laptop D505. The laptop powers up but the screen display is very dim. I can't see the image on the monitor. I've tried to manually increase the color/brightness button and nothing changes. ...


Sounds like your inverter or your backlight is failing. The inverter is an easy repair, the backlight can be replaced but it involves taking the LCD panel apart, The backlight comes installed on new screens. I can include a service manual below and possibly a generic guide to backlight replacement....

http://support.dell.com/support/edocs/systems/latd505/sm/display.htm#1052500

http://www.laptoprepair101.com/laptop/2007/01/31/replace-screen-inverter-fix-backlight/

Sep 23, 2009 | Dell Latitude D505 Notebook

1 Answer

THE SCREEN IS DARK. tHE LOPTOP TURNS ON BUT HAS NO DISPLAY. IT WILL NOT WORK ON EXTERNAL DISPLAY.


Your video card is bad. A bad LCD or backlight lamp would not prevent an external monitor from working. Even without a hard drive or Windows installed you would still get a text display on your screen. Some laptops have replaceable video cards but some are soldered to the motherboard and can't be replaced. This is a job for a repair shop, not a DIY project.

Sep 17, 2009 | Gateway Computers & Internet

1 Answer

My Gateway mx7118 lcd flickers whenever screen is opened,closed,


Connect an external monitor to the laptop and power it up, if you see a clear image on an external monitor, this means your video card is OK.

If you see a dim image or flicking image on the laptop's LCD screen it means you have a backlight problem.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

Mar 13, 2009 | Gateway MX7118 Notebook

1 Answer

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.

Mar 03, 2009 | Gateway 450SX4 Notebook

2 Answers

Gateway 400sd4


You should try plugging in an external CRT or LCD monitor. Most laptops will automatically enable this port when you connect a monitor and reboot, but you may need to hit some combination of keys on the laptop if you don't see anything.

You should try this to see if the laptop is running properly other than the internal LCD or VGA hardware.

Dec 16, 2007 | Gateway 400SD4 Notebook

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