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?
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Re: Gateway 400sd4 Laptop
This is problem related to the video card/video adapter on your PC. You'll need to get the video card replaced. Your Gateway 400sd4 laptop uses ATI M6P Graphics Card, and to correct the issue you'll need to replace the lcd inverter. However replacing the lcd inverter is not suggested as it can again turn bad due to a faulty motherboard, so, i'll suggest you to buy a new motherboard.
You can buy the motherboard for your gateway laptop 400sd4 from this link--
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Hi, Dear User..Does the Screen have a displayed Image?
If the laptop has no image at all it can be video card or LCD cable or the LCD panel. About the only non-invasive test you can try is to plug an external monitor into the laptop. This will determine if the problem is motherboard/graphics card or lcd cable/lcd screen. If you have an image on the external monitor then its likely to be lcd/cable/lcd screen.
Is the Displayed Image Faint?
A dim screen can be caused by three things;
1/ The LCD inverter which runs the LCD backlighting
2/ The CCFL backlighting fluro tube in the LCD panel
3/ The motherboard supplying signal & voltage to the inverter.
Hi josue fernan...
You need to see if your laptop lcd screen is faulty and/or the lcd inverer is faulty. 1....Test the lcd screen: Hook your laptop to an outside monitor and then start your laptop normally...if the picture on the external monitor is good, then your lcd screen is bad.
2....Backlight Faulty: If the monitor is still as dark like your lcd screen on the laptop then it could be the backlight that is faulty.
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LCD Backlight and Screen Replacements: http://www.laptopsman.info/0-Gateway-lcd-1.html
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.
If the laptop appears to boot up and the hard disk LED flashes then you have a backlight problem.
You may have a defective CCFL backlight, it may have the following symptom: Screen flashes on and off or displays reddish pink hue. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickers on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replace the CCFL lamp. To determine if the video card or the LCD is faulty, connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight. It could be a faulty inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out; usually the CCFL lamp fails before the inverter. The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills. Check out LCD Parts for service, parts, and DIY info Use this link to their WEB site: - www.ladparts.net
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....
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.
The LCD backlight is most likely faulty. If you look at the LCD screen to one side you could see a slight video image, provided the video card is working. To check if the video card is working connect the laptop's video output connector to an external monitor and then boot up your laptop. If you get an image on the monitor, then the problem is with the laptop's LCD display.
As I stated it could be the backlight or a faulty invertot that powers the backlight or it could be the cable/s that connects the LCD to the motherboard.
Try reseating these cables (requires dismantling the laptop).
If this doesn't work then you have a faulty LCD and needs to be replaced. Alternately if cost is too expensive, just use the laptop with an external monitor.
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.