Question about Gateway MX8734 Notebook

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Screen backlight not working - Gateway MX8734 Notebook

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To be sure it is only the back-light, look at the screen during boot at a sharp angle to see if you can discern any 'ghost' images. If so, then the video circuitry is functional.
The fluorescent tubes do have a finite lifespan but if you saw no warning such as dimming or flickering, it is probably a failed inverter that produces the high voltage for the tube.
These are frequently outsourced, often made by TDK. They are on a small board and not too tough to replace.
Dunno if it is the right one for your laptop but there is one listed on eBay currently:
Back-light inverter
Check the inverter board for an obvious part number to see which you need.

Posted on Aug 04, 2010

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Posted on Jan 02, 2017

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My friend has a 50inch philiphs tv the sound works but no image is there anything anyone could advised


Is it a LCD type screen? If it is, look close, is there no backlight, or its lit with no image? If its no backlight, the screen backlight inverter is bad. If there's backlight with no image, can be the display, connection cable or mainboard.

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Backlight is off


You either have a bad LCD or bad backlight board. The backlight on your screen is no different than a light bulb. If it burn out it stops working, if these is no power to the backlight your screen will have an image but no backlight to see the image.

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Gateway Solo 9550


If you can see a faint image of the desktop or the machine works with an external monitor, the either the screen inverter or the screen backlight has gone out. Start by checking the screen connections. The connection to the screen, screen to inverter and screen to motherboard. Connections can sometimes work loose. A loose connection generally causes the screen to go out entirely, rare but occasionally it can cause just the backlight to go. If the connections are good, then you will need to take it in to have the screen and inverter tested to find out which it is. If it turns out to be the backlight, you will have to purchase a new screen, screen are considered sealed units and just the backlight can't be changed out.

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1 Answer

No backlight


A couple things to try:

1st check the backlight settings

Turn on Backlighting and Control Brightness To use your device in dark environments, enable the automatic backlighting feature:
  1. From the Jump screen, press MENU t02003-15.gif then select Settings > Battery & Display.

  2. In the second group box, select the Turn on backlight when using device check box.

  3. Highlight, then select the Brightness slider to open it for editing. Roll the TRACKBALL right to increase brightness; roll the TRACKBALL left to decrease brightness. After you've made the adjustment, press the TRACKBALL to exit edit mode. t02007-55.jpg

  4. Select the length of time you want backlighting to stay on from the Turn off after pop-up menu.

  5. To use the device's light meter while the backlight is on, select the Use ambient light sensor check box.

  6. Press JUMP t02003-14.gif to return to the Jump screen and save your setting.
Now, when you press any button or key, or flip open the screen, backlighting will turn on for the set amount of time. Note that as long as you press a key or button before the set time elapses, the backlight will stay on.
Tips:
  • Even if you have not selected automatic backlighting, you can turn on backlighting at any time by pressing MENU t02003-15.gif + JUMP t02003-14.gif . The backlight will remain on for the time specified in the Backlight Turn off after pop-up menu.

  • When in key guard mode, you can turn on the backlight by pressing the RIGHT SHOULDER t02003-66.gif button.
If it still does not work, then you can try resetting the flex cable to the lcd.

Reseat the SidekickFlex cable

If that doesn't fix it then a new lcd assy will take care of the issue. they run about 45 dollars on ebay.

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2 Answers

The screen still displays the image but the backlight if off


you need to get the inverter changed out. Thats the part that changes DC to AC and powers the backlight

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1 Answer

No backlighting


You need to repalce the backlight/Screen altogether, or have someone do it for you. If the backlight has cracked then no amount of reconnecting will get it to work. Try one of the many Laptop repairers online to get a quote

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