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Laptop issues Backlight or Inverter?

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  • PipPip
  • 93 posts
I'm working on a Toshiba A75-S209 Laptop. The picture still shows, but the backlight isn't working. It's currently torn apart at my workstation. I took my fluke meter to the inverter outputs, and even with the laptop off, I'm getting a solid 4VAC. Then once on for a second, it jumps around to the low to mid teens. It is also making a higher pitched buzzing noise.

I'm thinking the inverter is my culprit.

I hooked the backlight up to the inverter just to see if it even flashes for a quick second.
Right when the high pitched buzzing begins, it illuminates dimly on about 2" - 3" of a single side. After about 1.5 seconds it goes dark again.

Is the backlight getting worn out? Or is the buzzing, irratic voltage outputting inverter my issue?


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    motto - Just get-er-done

  • Technician
  • 4,345 posts
If you can connect to a external monitor and the picture is good, then the problem is the screen. Have you read this foner article?


Here's another good tutorial.


good luck
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